SEVERE WEATHER GLOSSARY


   

"WHAT DOES THAT MEAN AGAIN?"

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


+
(ABBR.) HEAVY


-
(ABBR.) LIGHT


ADVISORY
HAZARDOUS WEATHER IS LIKELY, BUT DOES NOT REACH ANY WARNING CRITERIA. PRECAUTIONARY MEASURES FOR AN ADVISORY SCENARIO ARE USUALLY MINIMAL.


ADVISORY-FORCE WIND
WINDS OF 25-38 MPH ARE CONSIDERED TO BE ADVISORY-FORCE.


ALBERTA CLIPPER
A WINTER STORM ORIGINATING IN ALBERTA, CANADA AND MOVING QUICKLY THROUGH THE NORTHERN AND EASTERN US.


ALERT
AN ADVISORY, WATCH, WARNING, STATEMENT, OR TEST USED TO ANNOUNCE SIGNIFICANT WEATHER OR TEST SYSTEMS FOR ANNOUNCING SIGNIFICANT WEATHER.


BLIZZARD
A WINTER STORM CHARACTERIZED BY BLIZZARD CONDITIONS.


BLIZZARD CONDITIONS
WINDS TO 35 MPH AND SIGNIFICANT FALLING AND/OR BLOWING SNOW REDUCING VISIBILITIES UNDER A QUARTER MILE.


BLIZZARD WARNING (BZ-W)
BLIZZARD CONDITIONS ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. TYPICALLY WINTER STORM CONDITIONS ARE EXPECTED WITHIN 24-36 HOURS OR LESS.


BLIZZARD WATCH (BZ-WA)
BLIZZARD CONDITIONS ARE POSSIBLE IN YOUR AREA. TYPICALLY WINTER STORM CONDITIONS MAY BEGIN WITHIN 36-48 HOURS OR LESS.


BLOWING SNOW
SNOW WHICH IS PHYSICALLY MOVED FROM ONE LOCATION TO ANOTHER BY WIND. IF LIFTED HIGH ENOUGH, BLOWING SNOW REDUCES VISIBILITIES.


CAP
A LAYER OF WARM AIR ALOFT (TEMPERATURE INVERSION) IN OTHERWISE FAVORABLE CONDITIONS FOR SEVERE THUNDERSTORMS. A CAP MAY PREVENT STORMS FROM OCCURRING, OR IT MAY HOLD THEM DOWN UNTIL THE POTENTIAL GROWS ENOUGH FOR A MAJOR SEVERE OUTBREAK TO OCCUR.


CAPE
CONVECTIVE AVAILABLE POTENTIAL ENERGY, ONE OF THE FACTORS CONTRIBUTING TO SEVERE THUNDERSTORMS AND TORNADOES.


COAST
THE BOUNDARY BETWEEN OCEANIC WATERS AND ADJACENT LAND.


COASTAL FLOOD
FLOODING OF BEACH AREAS DUE TO THE OCEAN ITSELF RISING. USUALLY CAUSE BY ONSHORE WINDS.


COASTAL FLOOD ADVISORY (CFL-A)
MINOR FLOODING OF BEACH AREAS IS LIKELY IN YOUR AREA, BUT IS NOT A MAJOR ISSUE. RIP CURRENTS MAY BE AN ISSUE.


COASTAL FLOOD WARNING (CFL-W)
FLOODING OF COASTAL AREAS IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. RIP CURRENTS ARE LIKELY A HAZARD.


COASTAL FLOOD WATCH (CFL-WA)
FLOODING OF COASTAL AREAS IS POSSIBLE IN YOUR AREA.


COASTAL STORM
A STORM WHICH PRODUCES MOST OF ITS IMPACTS ALONG A LONG STRETCH OF COASTLINE AND NEAR-COAST AREAS, OFTEN A NOR'EASTER OR A STORM LIKE HURRICANE IRENE. MOST HURRICANES ARE NOT COASTAL STORMS


CREST
THE HIGHEST POINT TO WHICH WATER RISES IN A GIVEN EVENT. OFTEN USED TO MEASURE THE SEVERITY OF A FLOOD.


DENSE FOG ADVISORY (DF-A)
VISIBILITIES BELOW 1/4 MILE ARE IMMINENT OR OCCURRING IN YOUR AREA AS A RESULT OF FOG.


DERECHO
A LARGE AND LONG-LIVED SEVERE THUNDERSTORM CHARACTERIZED BY A BOWING SQUALL LINE STRUCTURE AND CONSISTENT SEVERE WIND REPORTS. SOME DERECHOS PRODUCE HURRICANE FORCE WINDS. A DERECHO MUST TRAVEL AT LEAST 250 MILES WHILE MAINTAINING STORM-FORCE WINDS.
-SERIAL DERECHO
A DERECHO OF VAST LENGTH, IN THE SHAPE OF EITHER A SINGLE MASSIVE BOW ECHO OR SEVERAL LARGE BOW ECHOES ARRANGED IN THE SHAPE OF WAVES, KNOWN AS A LINE ECHO WAVE PATTERN OR LEWP, TRAVELLING AHEAD OF A COLD FRONT. THE LATE OCTOBER 2010 NORTH AMERICAN STORM COMPLEX WAS WELL KNOWN FOR ITS STRONG WINDS, WHICH WERE COMPOUNDED BY A POWERFUL SERIAL DERECHO.
-PROGRESSIVE DERECHO
A DERECHO OF SHORTER LENGTH IN THE SHAPE OF A SINGLE LARGE BOW ECHO TRAVELLING ALONG A STATIONARY FRONT, OFTEN ALONG THE PERIPHERY OF A HEAT WAVE. THE JUNE 2012 NORTH AMERICAN DERECHO WAS A PROGRESSIVE DERECHO.


EXCESSIVE HEAT WARNING (XHT-W)
(SEE ALSO HEAT ADVISORY) HEAT INDICES OF 110+ OR ACTUAL TEMPERATURES OF 100+ ARE EXPECTED, IMMINENT, OR OCCURRING.


EXCESSIVE HEAT WATCH (XHT-WA)
(SEE ALSO HEAT ADVISORY) HEAT INDICES OF 110+ OR ACTUAL TEMPERATURES OF 100+ ARE POSSIBLE.


EXCESSIVE UV WARNING (XUV-W)
(SEE ALSO HIGH UV ADVISORY) DANGEROUS LEVELS OF UV RADIATION ARE EXPECTED, IMMINENT, OR OCCURRING.


EXCESSIVE UV WATCH (XUV-WA)
(SEE ALSO HIGH UV ADVISORY) DANGEROUS LEVELS OF UV RADIATION ARE POSSIBLE.


EXTREME WEATHER
(SEE ALSO SEVERE WEATHER) WEATHER WHICH APPROACHES THE UPPER END OF SEVERITY WHICH HAS BEEN RECORDED OR SETS RECORDS..


EXTREME WIND
(SEE ALSO WIND ADVISORY, HIGH WIND WARNING, STORM WIND WARNING, HURRICANE FORCE WIND WARNING) WINDS OF 115 MPH OR HIGHER ARE CONSIDERED EXTREME WIND.


EXTREME WIND WARNING (EXW-W)
(SEE ALSO WIND ADVISORY, HIGH WIND WARNING, STORM WIND WARNING, HURRICANE FORCE WIND WARNING) SUSTAINED WINDS OF 115 MPH OR HIGHER ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. MAY BE ACCOMPANIED BY A SEVERE THUNDERSTORM WARNING, SEVERE THUNDERSTORM EMERGENCY, TORNADO WARNING, TORNADO EMERGENCY, FLASH FLOOD WARNING, FLASH FLOOD EMERGENCY, AND/OR HURRICANE WARNING


EXTREME WIND WATCH (EXW-WA)
SUSTAINED WINDS OF 115 MPH OR HIGHER ARE POSSIBLE IN YOUR AREA.


FAST THAW WARNING (FHW-W)
A RAPID THAW RESULTING FROM SIGNIFICANTLY ABOVE-FREEZING TEMPERATURES EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA AND MAY RESULT IN NEW OR EXACERBATED FLOODING.


FAST THAW WATCH (FHW-WA)
A RAPID THAW RESULTING FROM SIGNIFICANTLY ABOVE-FREEZING TEMPERATURES IS POSSIBLE IN YOUR AREA AND MAY RESULT IN NEW OR EXACERBATED FLOODING.


FIRE
A SELF-SUSTAINING, EXOTHERMIC CHEMICAL REACTION CAUSED BY A SPARK OR HIGH TEMPERATURES, AND CREATING ADDITIONAL SPARKS AND HIGH TEMPERATURES, WHICH WILL SPREAD AND PERSIST UNTIL THE FUEL OR THE OXIDIZER (OXYGEN) WHICH ARE BURNING IN THE FIRE RUN OUT. A FIRE MAY BE CAUSED BY A LIGHTNING STRIKE, ANOTHER FIRE, OR ANOTHER SOURCE OF SPARK OR FLAME AND MAY BE PUT OUT BY RAINFALL, SNOWFALL, WATER, OR ANYTHING ELSE WHICH WILL COOL SURROUNDING FUELS AND KEEP OXYGEN OFF OF THEM.


FIRE WEATHER WATCH (FW-WA)
(SEE ALSO RED FLAG WARNING) CRITICAL FIRE CONDITIONS ARE POSSIBLE IN YOUR AREA.


FLASH FLOOD
A FLOOD WHICH REACHES ITS CREST WITHIN 6 HOURS OF THE TRIGGERING EVENT.


FLASH FLOOD EMERGENCY (FFL-E)
WIDESPREAD SIGNIFICANT FLASH FLOODING IS IMMINENT, OR OCCURRING IN YOUR POPULATED AREA. MAY BE ISSUED AS A RESULT OF ONGONG OR RECENT SEVERE STORMS, LANDFALLING TROPICAL CYCLONES, AND/OR RECENT DAM/LEVEE FAILURE. MAY BE ACCOMPANIED BY A SEVERE THUNDERSTORM WARNING, SEVERE THUNDERSTORM EMERGENCY, TORNADO WARNING, TORNADO EMERGENCY, FLASH FLOOD WARNING, HURRICANE WARNING, AND/OR TROPICAL STORM WARNING


FLASH FLOOD WARNING (FFL-W)
FLASH FLOODING IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. MAY BE ISSUED AS A RESULT OF ONGONG OR RECENT SEVERE STORMS, LANDFALLING TROPICAL CYCLONES, AND/OR RECENT DAM/LEVEE FAILURE. MAY BE ACCOMPANIED BY A SEVERE THUNDERSTORM WARNING, SEVERE THUNDERSTORM EMERGENCY, TORNADO WARNING, TORNADO EMERGENCY, FLASH FLOOD EMERGENCY, HURRICANE WARNING, AND/OR TROPICAL STORM WARNING


FLASH FLOOD WATCH (FFL-WA)
(ISSUED BY THE DUBLIN COFFMAN STORM FORECASTING CENTER) FLASH FLOODING IS POSSIBLE IN YOUR AREA. MAY BE ISSUED AS A RESULT OF EXPECTED SEVERE STORMS, LANDFALLING TROPICAL CYCLONES, AND/OR POTENTIAL DAM/LEVEE FAILURE.


FLASH FREEZE
AN EVENT IN WHICH RAIN OR MELT-ON-CONTACT SNOW FALLS SHORTLY BEFORE THE TEMPERATURE DROPS BELOW FREEZING, COVERING THE GROUND IN WATER WHICH FREEZES TO GLAZE ICE AT THAT TIME, OFTEN ACCOMPANIED BY A CHANGE IN PRECIPITATION TYPE FROM RAIN TO FREEZING RAIN OR SNOW.




FLOOD
A TEMPORARY SUBMERSION OF LAND NOT NORMALLY COVERED BY WATER


FLOOD ADVISORY (AREAL FLOOD ADVISORY) (FLD-A)
MINOR FLOODING OF DITCHES, HOLES, AND LOW LYING AREAS IS LIKELY IN YOUR AREA, BUT IS NOT A MAJOR ISSUE.


FLOOD WARNING (AREAL FLOOD WARNING) (FLD-W)
FLOODING OF DITCHES, HOLES, AND LOW LYING AREAS IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA.


FLOOD WATCH (AREAL FLOOD WATCH) (FLD-WA)
FLOODING OF DITCHES, HOLES, AND LOW LYING AREAS IS POSSIBLE IN YOUR AREA.


FLOOD ADVISORY (RIVER FLOOD ADVISORY) (RFL-A)
MINOR FLOODING ONE OR MORE RIVERS IS LIKELY IN YOUR AREA, BUT IS NOT A MAJOR ISSUE.


FLOOD WARNING (RIVER FLOOD WARNING) (RFL-W)
FLOODING OF ONE OR MORE RIVERS OR STREAMS IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. MAY BE ISSUED AS A RESULT OF ONGONG OR RECENT SEVERE STORMS, LANDFALLING TROPICAL CYCLONES, AND/OR RECENT DAM/LEVEE FAILURE.


FLOOD WATCH (RIVER FLOOD WATCH) (RFL-WA)
FLOODING OF ONE OR MORE RIVERS OR STREAMS IS POSSIBLE IN YOUR AREA.


FREEZE
A PERIOD OF TEMPERATURES BELOW 32 DEGREES F FOLLOWING A PERIOD OF WARMER TEMPERATURES, USUALLY RESULTING IN FREEZING OF AREA PUDDLES AND OTHER SURFACE WATER AND FACILITATING THE POTENTIAL FOR LASTING SNOW ACCUMULATIONS.


FREEZE WARNING (FRZ-W)
(OUTSIDE OF METEOROLOGICAL WINTER ONLY) TEMPERATURES BELOW 32.1 DEGREES ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA.


FREEZE WATCH (FRZ-WA)
(OUTSIDE OF METEOROLOGICAL WINTER ONLY) TEMPERATURES BELOW 32.1 DEGREES ARE POSSIBLE IN YOUR AREA.


FREEEZING
32 DEGREES F, THE TEMPERATURE AT WHICH WATER FREEZES.
-OR- THE PROCESS OF CHANGING FROM A LIQUID TO A SOLID
-OR- THE PROCESS OF TEMPERATURES DROPPING BELOW 32 DEGREES F.


FREEZING DRIZZLE ADVISORY (FZD-A)
(ISSUED BY THE DCWS WINTER STORM CENTER) A FREEZING DRIZZLE EVENT IS LIKELY IN YOUR AREA WHICH WILL PRODUCE A TRACE INCH OF ICE ACCUMULATIONS, TYPICALLY WITHIN 48-72 HOURS.


FREEZING FOG ADVISORY (FZF-A)
FOG IS IMMINENT OR OCCURRING IN YOUR AREA WHICH WILL DEPOSITE ICE ON OBJECTS IT COMES IN CONTACT WITH.


FREEZING RAIN
RAIN WHICH FREEZES ON CONTACT, RESULTING IN GLAZE ICE. NOT TO BE CONFUSED WITH SLEET.


FREEZING RAIN ADVISORY (FZR-A)
(ISSUED BY THE DCWS WINTER STORM CENTER) A FREEZING RAIN EVENT IS LIKELY IN YOUR AREA WHICH WILL PRODUCE < 1/4 INCH OF ICE ACCUMULATIONS, TYPICALLY WITHIN 48-72 HOURS.
-REGULAR
THE ICE ACCUMULATIONS WILL BE PURE FREEZING RAIN.
-FOR SLEET AND FREEZING RAIN
THE ICE ACCUMULATIONS WILL BE A MIX OF SLEET AND FREEZING RAIN, BUT WILL FORM A SOLID ICE PACK. THIS IS TYPICALLY LESS DANGEROUS.


FROST ADVISORY (FRS-A)
(OUTSIDE OF METEOROLOGICAL WINTER ONLY) TEMPERATURES NEAR 32 DEGREES ARE POSSIBLE IN YOUR AREA.


FROSTING TEMPERATURE
36 DEGREES F, THE TEMPERATURE AT WHICH FROST USUALLY FORMS.


FZR
(ABBR.) FREEZING RAIN


FUNNEL CLOUD
A VIOLENTLY ROTATING COLUMN OF AIR EXTENDING FROM A CLOUD BUT NOT TOUCHING SURFACE WATER OR THE GROUND. IF A FUNNEL CLOUD MAKES CONTACT WITH SURFACE WATER IT BECOMES A WATERSPOUT. IF IT TOUCHES LAND IT BECOMES A TORNADO.


GALE-FORCE WIND
WINDS OF 39-57 MPH ARE CONSIDERED TO BE GALE-FORCE.


GALE WARNING (G-W)
(SEE ALSO HIGH WIND WARNING, TROPICAL STORM WARNING) SUSTAINED WINDS OR FREQUENT GUSTS OF 35-58 MPH OR OCCASIONAL GUSTS 58-74 MPH ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR MARINE AREA.


GALE WATCH (G-WA)
SUSTAINED WINDS OR FREQUENT GUSTS OF 35-58 MPH OR OCCASIONAL GUSTS 58-74 MPH ARE POSSIBLE IN YOUR MARINE AREA.


GPL
(ABBR.) GRAUPEL.


GRAUPEL
SNOW CRYSTALS WHICH ACCUMULATE A LAYER OF FROST ON THE WAY DOWN, BECOMING SOFT, ROUND, WHITE PELLETS VISUALLY RESEMBLING STYROFOAM. NOT TO BE CONFUSED WITH SLEET.


GUSTNADO
A VIOLENTLY ROTATING COLUMN OF AIR EXTENDING FROM THE GROUND UP BUT NOT TOUCHING THE CLOUD BASE. IF A GUSTNADO MAKES CONTACT WITH THE CLOUD BASE IT BECOMES A SPIN-UP TORNADO.


HAIL
A THUNDERSTORM-GENERATED TYPE OF PRECIPITATION MADE OF MANY LAYERS OF SOLID ICE WHICH FALLS TO THE GROUND AS CHUNKS.


HAILSTONE
A CHUNK OF ICE WHICH FALLS IN THE FORM OF HAIL.


HAILSTORM
A THUNDERSTORM PRODUCING HAIL.


HARD FREEZE
A PERIOD OF TEMPERATURES 28 DEGREES F OR BELOW, RAPIDLY FREEZING ANY LIQUID WATER AND DAMAGING PLANTS WHICH DO NOT SURVIVE WELL IN SUBFREEZING TEMPERATURES.


HARD FREEZE WARNING (HFZ-W)
(OUTSIDE OF METEOROLOGICAL WINTER ONLY) TEMPERATURES AT OR BELOW 28 DEGREES ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA.


HARD FREEZE WATCH (HFZ-WA)
(OUTSIDE OF METEOROLOGICAL WINTER ONLY) TEMPERATURES AT OR BELOW 28 DEGREES ARE POSSIBLE IN YOUR AREA.


HAZARDOUS SEAS WARNING (HS-W)
DANGEROUS MARINE CONDITIONS ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR MARINE AREA.


HAZARDOUS SEAS WATCH (HS-W)
DANGEROUS MARINE CONDITIONS ARE POSSIBLE IN YOUR MARINE AREA.


HAZARDOUS WEATHER
SEE SEVERE WEATHER


HEAT ADVISORY (HT-A)
(SEE ALSO EXCESSIVE HEAT WARNING) HEAT INDICES OF 100+ OR ACTUAL TEMPERATURES OF 95+ ARE EXPECTED, IMMINENT, OR OCCURRING.


HIGH WIND WARNING (HW-W)
(SEE ALSO GALE WARNING, TROPICAL STORM WARNING) SUSTAINED WINDS OR FREQUENT GUSTS OF 35-58 MPH OR OCCASIONAL GUSTS 58-74 MPH ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA.


HIGH WIND WATCH (HW-WA)
SSUSTAINED WINDS OR FREQUENT GUSTS OF 35-58 MPH OR OCCASIONAL GUSTS 58-74 MPH ARE POSSIBLE IN YOUR AREA.


HIGH UV ADVISORY (HUV-A)
(SEE ALSO EXCESSIVE UV WARNING) HAZARDOUS LEVELS OF UV RADIATION ARE LIKELY, EXPECTED, IMMINENT, OR OCCURRING.


HURRICANE
A TROPICAL CYCLONE WITH WINDS OF AT LEAST 74 MPH. MOST HURRICANES ARE NOT COASTAL STORMS


HURRICANE-FORCE WIND
WINDS OF 74-115 MPH ARE CONSIDERED TO BE HURRICANE FORCE.


HURRICANE FORCE WIND WARNING (HFW-W)
(SEE ALSO HURRICANE WARNING) SUSTAINED WINDS OR FREQUENT GUSTS OF 74-115 MPH OR OCCASIONAL GUSTS 115 MPH OR HIGHER ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA.


HURRICANE FORCE WIND WATCH (HFW-WA)
SUSTAINED WINDS OR FREQUENT GUSTS OF 74-115 MPH OR OCCASIONAL GUSTS 115 MPH OR HIGHER ARE POSSIBLE IN YOUR AREA.


HURRICANE LOCAL STATEMENT (HUR-LS)
(SEE ALSO TROPICAL STORM LOCAL STATEMENT) AN INFORMATIONAL PRODUCT ON A HURRICANE NEAR YOUR AREA.


HURRICANE WARNING (HUR-W/IHU-W)
(ISSUED BY THE DCWS HURRICANE CENTER; SEE ALSO TROPICAL STORM WARNING, HURRICANE FORCE WIND WARNING) HURRICANE CONDITIONS, INCLUDING WINDS OVER 74 MPH, ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR COASTAL, MARINE, OR INLAND AREA WITHIN 36 HOURS.


HURRICANE WATCH (HUR-WA/IHU-WA)
(ISSUED BY THE DCWS HURRICANE CENTER) HURRICANE CONDITIONS, INCLUDING WINDS OVER 74 MPH, ARE POSSIBLE IN YOUR COASTAL, MARINE, OR INLAND AREA WITHIN 48 HOURS.


ICE
FROZEN WATER BELOW 32 DEGREES F.


ICE PELLETS
SEE SLEET.


ICE STORM
A STORM CAUSING 1/4" OR MORE OF ICE TO ACCUMULATE.


ICE STORM WARNING (ICE-W)
(ISSUED BY THE DCWS WINTER STORM CENTER) AN ICE STORM IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA WHICH IS EXPECTED TO PRODUCE 1/4" OR MORE OF ICE ACCUMULATIONS. TYPICALLY ICE STORM CONDITIONS ARE EXPECTED TO BEGIN WITHIN 36-48 HOURS OR LESS.
-REGULAR
THE ICE ACCUMULATIONS WILL BE PURE FREEZING RAIN. THIS IS THE SECOND MOST SEVERE WINTER WEATHER ALERT AFTER BLIZZARD AND LAKE-EFFECT BLIZZARD WARNINGS.
-FOR SLEET AND ICE
THE ICE ACCUMULATIONS WILL BE A MIX OF SLEET AND FREEZING RAIN, BUT WILL FORM A SOLID ICE PACK. THIS IS TYPICALLY SOMEWHAT LESS DANGEROUS.


ICE STORM WATCH (ICE-WA)
(ISSUED BY THE DCWS WINTER STORM CENTER) AN ICE STORM IS POSSIBLE IN YOUR AREA WHICH MAY PRODUCE 1/4" OR MORE OF ICE ACCUMULATIONS. TYPICALLY WINTER STORM CONDITIONS ARE EXPECTED TO BEGIN WITHIN 48-72 HOURS OR LESS.


JANUARY THAW
A PERIOD OF TEMPERATURES ABOVE 32 DEGREES F RESULTING IN THE PARTIAL OR TOTAL MELTING OF AREA SNOW AND ICE PACKS DURING THE MONTH OF JANUARY. IT IS OFTEN SAID THAT EVERYWHERE EXPERIENCING WINTRY CONDITIONS HAS AT LEAST ONE JANUARY THAW A YEAR.


JONAH LARSEN WINTER STORM SCALE (JLWSS)
A SCALE RATING WINTER STORMS ON A SCALE OF 0-5 BASED ON THEIR PRECIPITATION TOTALS AND WIND.


LAKE
A PERMANENT BODY OF STANDING FRESHWATER.


LAKE-EFFECT BLIZZARD WARNING (LBZ-W)
(ISSUED BY THE DCWS WINTER STORM CENTER) LAKE-EFFECT SNOW AND HIGH WINDS CAUSING BLIZZARD CONDITIONS ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. TYPICALLY WINTER STORM CONDITIONS ARE EXPECTED WITHIN 36-48 HOURS OR LESS.


LAKE-EFFECT BLIZZARD WATCH (LBZ-WA)
(ISSUED BY THE DCWS WINTER STORM CENTER) LAKE-EFFECT SNOW AND HIGH WINDS CAUSING BLIZZARD CONDITIONS ARE POSSIBLE IN YOUR AREA. TYPICALLY WINTER STORM CONDITIONS MAY BEGIN WITHIN 48-72 HOURS OR LESS.


LAKE-EFFECT SNOW ADVISORY (LES-A)
(ISSUED BY THE DCWS WINTER STORM CENTER) LAKE-EFFECT SNOW 2-4 INCHES WITHIN 12 HOURS OR 4-6 INCHES TOTAL IS LIKELY IN YOUR AREA. TYPICALLY WINTER STORM CONDITIONS ARE LIKELY WITHIN 48-72 HOURS OR LESS.


LAKE-EFFECT SNOW WARNING (LES-W)
(ISSUED BY THE DCWS WINTER STORM CENTER) LAKE-EFFECT SNOW 4-6 INCHES WITHIN 12 HOURS OR 6 OR MORE INCHES TOTAL IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. TYPICALLY WINTER STORM CONDITIONS MAY BEGIN WITHIN 36-48 HOURS OR LESS.


LAKE-EFFECT SNOW WATCH (LES-WA)
(ISSUED BY THE DCWS WINTER STORM CENTER) LAKE-EFFECT SNOW 4-6 INCHES WITHIN 12 HOURS OR 6 OR MORE INCHES TOTAL IS POSSIBLE IN YOUR AREA. TYPICALLY WINTER STORM CONDITIONS MAY BEGIN WITHIN 47-72 HOURS OR LESS.


LAKESHORE
THE BOUNDARY BETWEEN A PERMANENT BODY OF FRESHWATER AND ADJACENT LAND.


LAKESHORE FLOOD
FLOODING OF BEACHES AND OTHER LAKESHORE AREAS CAUSED BY THE LEVEL OF THE WATER RISING WELL ABOVE NORMAL.


LAKESHORE FLOOD ADVISORY (LFL-A)
MINOR FLOODING OF BEACH AREAS IS LIKELY IN YOUR AREA, BUT IS NOT A MAJOR ISSUE. RIP CURRENTS MAY BE AN ISSUE.


LAKESHORE FLOOD WARNING (LFL-W)
FLOODING OF NEAR-LAKE AREAS IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. RIP CURRENTS ARE LIKELY A HAZARD.


LAKESHORE FLOOD WATCH (LFL-WA)
FLOODING OF NEAR-LAKE AREAS IS POSSIBLE IN YOUR AREA.


LAPSE RATE
THE RATE AT WHICH THE TEMPERATURE DROPS AS YOU GO UP IN THE ATMOSPHERE. A HIGHER LAPSE RATE FAVORS MORE QUICKLY RISING AIR, AND CONTRIBUTES TO SEVERE THUNDERSTORM AND TORNADO DEVELOPMENT.


LARGE HAIL
HAIL MEETING THE SEVERE CRITERION OF 1 INCH DIAMETER OR GREATER.


MAJOR BLIZZARD
A BLIZZARD MEETING OR EXCEEDING LV.4 CRITERIA.


MAJOR HURRICANE
A TROPICAL CYCLONE WITH WINDS OF AT LEAST 115 MPH.


MAJOR ICE STORM
AN ICE STORM MEETING OR EXCEEDING LV.3 CRITERIA.


MAJOR SLEET STORM
A SLEET STORM MEETING OR EXCEEDING LV.3 CRITERIA.


MAJOR WINTER STORM
A WINTER STORM MEETING OR EXCEEDING LV.3 CRITERIA.


MESOCYCLOGENESIS
THE FORMATION AND STRENGTHENING OF SUPERCELL THUNDERSTORMS CAPABLE OF PRODUCING A TORNADO. MESOCYCLOGENESIS IS THE EVENT NECESSARY TO TRIGGER A TORNADO WARNING.


MESOCYCLOLYSIS
THE WEAKENING AND DISSIPATION OF SUPERCELL THUNDERSTORMS CAPABLE OF PRODUCING A TORNADO. MESOCYCLOLYSIS IS THE EVENT NECESSARY TO CANCEL A TORNADO WARNING.


NP
(ABBR.) NO PRECIPITATION.


NOP
SEE NP


PRECIPITATION
WATER WHICH NATURALLY FALLS FROM THE SKY, EXCEPT IN VAPOR FORM..


QLCS
(ABBR.) QUASI-LINEAR CONVECTIVE SYSTEM.


QUASI-LINEAR CONVECTIVE SYSTEM
A BROKEN SQUALL LINE.


RED FLAG WARNING (RF-W)
(SEE ALSO FIRE WEATHER WATCH) CRITICAL FIRE CONDITIONS ARE IMMINENT OR OCCURRING IN YOUR AREA.


SAFFIR-SIMPSON HURRICANE SCALE (SSHS)
A SCALE RATING TROPICAL CYCLONES ON A SCALE OF 0-5 BASED ON THEIR WIND SPEED.


SEVERE THUNDERSNOW WARNING (TSN-W)
A SEVERE THUNDERSNOW IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA WHICH WILL PRODUCE DAMAGING WINDS >58 MPH AND/OR LARGE HAIL >3/4" DIAMETER. MAY BE ACCOMPANIED BY A SNOW TORNADO WARNING, TORNADO EMERGENCY, BLIZZARD WARNING, AND/OR SEVERE THUNDERSNOW EMERGENCY.


SEVERE THUNDERSTORM EMERGENCY (TS-E)
A EXTREME SEVERE THUNDERSTORM IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR POPULATED AREA WHICH WILL PRODUCE ANY DAMAGING WINDS >80 MPH AND/OR LARGE HAIL >2.4" DIAMETER. MAY BE ACCOMPANIED BY A SEVERE THUNDERSTORM WARNING, TORNADO WARNING, TORNADO EMERGENCY, FLASH FLOOD WARNING, AND/OR FLASH FLOOD EMERGENCY


SEVERE THUNDERSNOW WATCH (TSN-WA)
(ISSUED BY THE DCWS FORECASTING CENTER) MULTIPLE SEVERE THUNDERSNOWS ARE POSSIBLE IN YOUR AREA WHICH MAY PRODUCE DAMAGING WINDS >58 MPH AND/OR LARGE HAIL >3/4" DIAMETER.


SEVERE THUNDERSTORM WARNING (TS-W)
A SEVERE THUNDERSTORM IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA WHICH WILL PRODUCE ANY COMBINATION OF DAMAGING WINDS >58 MPH, LARGE HAIL >3/4" DIAMETER, AND/OR FLASH FLOODING. MAY BE ACCOMPANIED BY A SEVERE THUNDERSTORM EMERGENCY, TORNADO WARNING, TORNADO EMERGENCY, FLASH FLOOD WARNING, AND/OR FLASH FLOOD EMERGENCY


SEVERE THUNDERSTORM WATCH (TS-WA)
(ISSUED BY THE DCWS STORM FORECASTING CENTER) MULTIPLE SEVERE THUNDERSTORMS ARE POSSIBLE IN YOUR AREA WHICH MAY PRODUCE ANY COMBINATION OF DAMAGING WINDS >58 MPH, LARGE HAIL >3/4" DIAMETER, AND/OR FLASH FLOODING.


SEVERE TROPICAL STORM WARNING
NOT AN INDEPENDENT OR OFFICIAL TYPE OF WEATHER ALERT, A SEVERE TROPICAL STORM WARNING IS AN ENHANCED WORDING OF THE REGULAR TROPICAL STORM WARNING (TRS-W) WHEN WINDS ABOVE 58 MPH (STORM FORCE) ARE EXPECTED IN THE TROPICAL STORM WARNING AREA. THIS TYPE OF WARNING IS NOT ISSUED IF ANY HURRICANE WARNINGS ARE IN EFFECT IN THE AREA BECAUSE IN THAT SCENARIO, STORM FORCE WINDS IN THE TROPICAL STORM WARNING AREA IS A GIVEN.


SEVERE WEATHER
WEATHER CONDITIONS WHICH RESULT IN A SIGNIFICANT CHANCE OF INJURY TO LIVING ANIMALS OR DAMAGE TO PLANTS OR PROPERTY.


SIGNIFICANT WEATHER
WEATHER CONDITIONS WHICH MAY BE HAZARDOUS, BUT GENERALLY WILL PRODUCE IMPACTS WITHOUT CAUSING A HIGH DANGER LIFE, HEALTH, OR PROPERTY.


"SIGNIFICANT SEVERE" REPORT
IN METEOROLOGICAL JARGON, A REPORT OF HURRICANE FORCE WIND OR STRONGER, HEN EGG SIZE HAIL OR LARGER, OR AN EF2+ TORNADO.


SIGNIFICANT WEATHER ADVISORY (SGW-A)
STRONG STORMS ARE POSSIBLE IN YOUR AREA WHICH MAY PRODUCE HAZARDOUS CONDITIONS INCLUDING WINDS OVER 39 MPH, HALF-INCH HAIL OR LARGER, AND HEAVY RAIN..


SMALL CRAFT ADVISORY (SC-A)
SUSTAINED WINDS OF 25-35 MPH OR GUSTS 35-58 MPH ARE POSSIBLE IN YOUR MARINE AREA.


SMALL HAIL
HAIL SMALLER THAN THE SEVERE CRITERION OF 1 INCH DIAMETER.


SLEET
RAIN THAT FREEZES ON THE WAY DOWN. SLEET APPEARS AS SMALL, SAND-LIKE ICE PELLETS. AN INDIVIDUAL SLEET PELLET IS CLEAR BUT AN ACCUMULATION OF THEM IS WHITE DUE TO REFRACTION OF THE LIGHT STRIKING THEM.


SLOPE CONDITIONS ADVISORY (SLC-A)
SLIGHTLY HAZARDOUS SLOPE CONDITIONS ARE LIKELY IN YOUR MOUNTAIN AREA.


SLOPE CONDITIONS ALERT (SLC-AL)
SOMEWHAT HAZARDOUS SLOPE CONDITIONS ARE LIKELY IN YOUR MOUNTAIN AREA.


SLOPE CONDITIONS REPORT (SLC-R)
A STATEMENT GIVING INFORMATION ABOUT CONDITIONS ON LOCAL MOUNTAINS.


SLOPE CONDITIONS STATEMENT (SLC-S)
A STATEMENT ABOUT SLOPE CONDITIONS WHICH DO NOT MEET ADVISORY CRITERIA IN YOUR MOUNTAIN AREA.


SLOPE CONDITIONS WARNING (SLC-W)
HAZARDOUS SLOPE CONDITIONS ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA.


SLOPE CONDITIONS WATCH (SLC-WA)
HAZARDOUS SLOPE CONDITIONS ARE POSSIBLE IN YOUR AREA.


SLT
(ABBR.) SLEET


SNO
(ABBR.) SNOW


SNOW
CRYSTALLINE PRECIPITATION CONSISTING OF INDIVIDUAL ICE CRYSTALS, OFTEN STUCK TOGETHER BY MOISTURE.


SNOW ADVISORY (SNO-W)
(ISSUED BY THE DCWS WINTER STORM CENTER; OUTSIDE OF METEOROLOGICAL WINTER ONLY) AN EXTREMELY LIGHT DUSTING OF SNOW IS LIKELY IN YOUR AREA.


SNOW WARNING (SNO-W)
(ISSUED BY THE DCWS WINTER STORM CENTER; OUTSIDE OF METEOROLOGICAL WINTER ONLY) SNOW IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA, AND WINTER APPEARS TO BE STARTING EARLY.


SNOW WATCH (SNO-WA)
(ISSUED BY THE DCWS WINTER STORM CENTER; OUTSIDE OF METEOROLOGICAL WINTER ONLY) SNOW IS POSSIBLE IN YOUR AREA.


SNOW TORNADO WARNING (STO-W)
A STRONG SUPERCELL THUNDERSNOW IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA WHICH IS PRODUCING OR IS CAPABLE OF PRODUCING A TORNADO. THIS STORM ALSO MAY PRODUCE DAMAGING WINDS >58 MPH AND/OR LARGE HAIL >3/4" DIAMETER. ALSO AUTOMATICALLY A SEVERE THUNDERSNOW WARNING. MAY BE ACCOMPANIED BY A SEVERE THUNDERSNOW WARNING, SEVERE THUNDERSTORM EMERGENCY, AND/OR TORNADO EMERGENCY.


SNOW TORNADO WATCH (STO-WA)
(ISSUED BY THE DCWS STORM FORECASTING CENTER) MULTIPLE STRONG SUPERCELL THUNDERSNOWS ARE POSSIBLE IN YOUR AREA WHICH MAY BE CAPABLE OF PRODUCING TORNADOES. ALSO AUTOMATICALLY A SEVERE THUNDERSNOW WATCH. STORMS ALSO MAY PRODUCE ANY COMBINATION OF DAMAGING WINDS >58 MPH, LARGE HAIL >3/4" DIAMETER, AND/OR FLASH FLOODING.


SPECIAL MARINE WARNING (SM-W)
STRONG STORMS ARE EXPECTED IN YOUR MARINE AREA WHICH WILL PRODUCE HAZARDOUS SEA CONDITIONS AND ARE AN IMMEDIATE DANGER.


SPECIAL SEVERE WEATHER ADVISORY (SVW-A)
A WEATHER ALERT ADVISING OF HAZARDOUS CONDITIONS WHICH DO NOT FIT INTO ANY ALERT CATEGORY AND ARE LIKELY.


SPECIAL SEVERE WEATHER ALERT (SVW-AL)
A WEATHER ALERT ADVISING OF SOMEWHAT HAZARDOUS CONDITIONS WHICH DO NOT FIT INTO ANY ALERT CATEGORY AND ARE LIKELY.


SPECIAL SEVERE WEATHER REPORT (SVW-R)
A REPORT OF RECENT OR OCCURRING SEVERE WEATHER IN YOUR AREA.


SPECIAL SEVERE WEATHER STATEMENT (SVW-S)
A STATEMENT ABOUT SEVERE WEATHER IN YOUR AREA.


SPECIAL SEVERE WEATHER WARNING (SVW-W)
A WEATHER ALERT WARNING OF HAZARDOUS CONDITIONS WHICH DO NOT FIT INTO ANY ALERT CATEGORY AND ARE EXPECTED, IMMINENT, OR OCCURRING.


SPECIAL SEVERE WEATHER WATCH (SVW-WA)
A WEATHER ALERT ADVISING OF HAZARDOUS CONDITIONS WHICH DO NOT FIT INTO ANY ALERT CATEGORY AND ARE POSSIBLE.


SPECIAL WEATHER STATEMENT (SWX-S)
A WEATHER ALERT ADVISING OF SLIGHTLY HAZARDOUS CONDITIONS WHICH DO NOT REACH ANY WARNING CRITERIA.


SPIN-UP TORNADO
A VIOLENTLY ROTATING COLUMN OF AIR EXTENDING FROM THE GROUND UP TO THE CLOUD BASE GENERATED BY A GUSTNADO WHICH INTENSIFIES TO SUCH A DEGREE AS TO RISE ALL THE WAY TO THE CLOUD BASE.


STORM
A DISTURBANCE IN THE ATMOSPHERE.


STORM-FORCE WIND
WINDS OF 58-73 MPH ARE CONSIDERED TO BE STORM FORCE.


STORM WIND WARNING (SW-W)
(SEE ALSO WIND ADVISORY, HIGH WIND WARNING, HURRICANE FORCE WIND WARNING, EXTREME WIND WARNING) SUSTAINED WINDS OF 58-74 MPH OR GUSTS 74-115 MPH ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA.


STORM WIND WATCH (SW-WA)
SUSTAINED WINDS OF 58-73 MPH OR GUSTS 73-115 MPH ARE POSSIBLE IN YOUR AREA.


STORM WARNING (S-W)
SUSTAINED WINDS OF 58-73 MPH OR GUSTS 73-115 MPH ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR MARINE AREA.


STORM WATCH (S-WA)
SUSTAINED WINDS OF 58-73 MPH OR GUSTS 73-115 MPH ARE POSSIBLE IN YOUR MARINE AREA.


TEMPERATURE INVERSION
AN OCCURRENCE OF WARMER AIR SITTING ABOVE COLDER AIR IN THE ATMOSPHERE, CONTRARY TO THE TYPICAL SCENARIO. A TEMPERATURE INVERSION IS NECESSARY FOR SLEET, FREEZING RAIN, OR A CAP TO FORM. AN INVERSION MAY ALSO PREVENT AIR POLLUTION FROM RISING, RESULTING IN A DETERIORATION OF LOCAL AIR QUALITY.


THAW
A PERIOD OF TEMPERATURES ABOVE 32 DEGREES F FOLLOWING A PERIOD OF LOWER TEMPERATURES, USUALLY RESULTING IN THE PARTIAL OR TOTAL MELTING OF AREA SNOW AND ICE PACKS.


THAW WATCH (THW-WA)
A THAW RESULTING FROM RIGHT-ABOUT-FREEZING TEMPERATURES IS POSSIBLE IN YOUR AREA.


THAW WARNING (THW-W)
A THAW RESULTING FROM ABOVE-FREEZING TEMPERATURES EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA.


THAW WATCH (THW-WA)
A THAW RESULTING FROM ABOVE-FREEZING TEMPERATURES IS POSSIBLE IN YOUR AREA.


THUNDERICE
A STORM PRODUCING THUNDER, LIGHTNING, AND FREEZING RAIN SIMULTANEOUSLY IN AN AREA.


THUNDERSLEET
A STORM PRODUCING THUNDER, LIGHTNING, AND SLEET SIMULTANEOUSLY IN AN AREA.


THUNDERSNOW
A STORM PRODUCING THUNDER, LIGHTNING, AND SNOW SIMULTANEOUSLY IN AN AREA.


THUNDERSTORM
A CONVECTIVE STORM, CAUSED BY VIOLENTLY RISING AND FALLING AIR AND USUALLY PRODUCING THUNDER AND LIGHTNING.


TORNADO
A VIOLENTLY ROTATING COLUMN OF AIR EXTENDING FROM A CLOUD TO THE GROUND.


TORNADO EMERGENCY (TOR-E)
A TORNADO IS CONFIRMED TO BE OCCURRING IN YOUR POPULATED AREA. THIS STORM ALSO MAY PRODUCE ANY COMBINATION OF DAMAGING WINDS >58 MPH, LARGE HAIL >3/4" DIAMETER, AND/OR FLASH FLOODING. ALSO AUTOMATICALLY A SEVERE THUNDERSTORM WARNING AND A TORNADO WARNING. MAY BE ACCOMPANIED BY A SEVERE THUNDERSTORM WARNING, SEVERE THUNDERSTORM EMERGENCY, TORNADO WARNING, FLASH FLOOD WARNING, AND/OR FLASH FLOOD EMERGENCY


TORNADO WARNING (TOR-W)
A STRONG SUPERCELL THUNDERSTORM IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA WHICH IS PRODUCING OR IS CAPABLE OF PRODUCING A TORNADO. THIS STORM ALSO MAY PRODUCE ANY COMBINATION OF DAMAGING WINDS >58 MPH, LARGE HAIL >3/4" DIAMETER, AND/OR FLASH FLOODING. ALSO AUTOMATICALLY A SEVERE THUNDERSTORM WARNING. MAY BE ACCOMPANIED BY A SEVERE THUNDERSTORM WARNING, SEVERE THUNDERSTORM EMERGENCY, TORNADO EMERGENCY, FLASH FLOOD WARNING, OR FLASH FLOOD EMERGENCY


TORNADO WATCH (TOR-WA)
(ISSUED BY THE DUBLIN COFFMAN STORM FORECASTING CENTER) MULTIPLE STRONG SUPERCELL THUNDERSTORMS ARE POSSIBLE IN YOUR AREA WHICH MAY BE CAPABLE OF PRODUCING TORNADOES. ALSO AUTOMATICALLY A SEVERE THUNDERSTORM WATCH. STORMS ALSO MAY PRODUCE ANY COMBINATION OF DAMAGING WINDS >58 MPH, LARGE HAIL >3/4" DIAMETER, AND/OR FLASH FLOODING.


TORNADOGENESIS
THE FORMATION OF A TORNADO.


TORNADOLYSIS
THE DISSIPATION OF A TORNADO.


TROPICAL CYCLOGENESIS
THE FORMATION AND STRENGTHENING OF A TROPICAL STORM, HURRICANE, OR TROPICAL DEPRESSION.


TROPICAL CYCLOLYSIS
THE WEAKENING AND DISSIPATION OF A TROPICAL STORM, HURRICANE, OR TROPICAL DEPRESSION.


TROPICAL CYCLONE
A WARM-CORE, SYNOPTIC-SCALE LOW PRESSURE SYSTEM CHARACTERIZED BY SPIRAL RAINBANDS AND FORMATION IN WARM AND EXTREMELY HUMID AREAS, USUALLY THE OCEAN BUT POSSIBLY OVER WARM LAKES OR HOT, VERY HUMID LAND. IF A TROPICAL CYCLONE IS REMOVED FROM ITS SOURCES OF HEAT AND HUMIDITY, IT WEAKENS AND ULTIMATELY DISSIPATES.


TROPICAL DEPRESSION
A TROPICAL CYCLONE WITH WINDS FROM 25 TO 38 MPH.


TROPICAL DEPRESSION ADVISORY (TRD-A)
(ISSUED BY THE DCWS HURRICANE CENTER; SEE ALSO TROPICAL STORM WARNING) TROPICAL DEPRESSION CONDITIONS ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR COASTAL, MARINE, OR INLAND AREA WITHIN 36 HOURS.


TROPICAL STORM
A TROPICAL CYCLONE WITH WINDS FROM 39 TO 73 MPH.


TROPICAL STORM LOCAL STATEMENT (TRS-LS)
(SEE ALSO HURRICANE LOCAL STATEMENT) AN INFORMATIONAL PRODUCT ON A TROPICAL STORM NEAR YOUR AREA.


TROPICAL STORM WARNING (TRS-W/ITR-W)
(ISSUED BY THE DCWS HURRICANE CENTER; SEE ALSO HURRICANE WARNING) TROPICAL STORM CONDITIONS, INCLUDING WINDS 39-73 MPH, ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR COASTAL, MARINE, OR INLAND AREA WITHIN 36 HOURS.


TROPICAL STORM WATCH(TRS-WA/ITR-WA)
(ISSUED BY THE DCWS HURRICANE CENTER; SEE ALSO HURRICANE WATCH) TROPICAL STORM CONDITIONS ARE POSSIBLE IN YOUR COASTAL, MARINE, OR INLAND AREA WITHIN 48 HOURS.


TROPICAL WEATHER OULOOK (TRP-U)
(ISSUED BY THE DUBLN COFFMAN HURRICANE CENTER; SEE ALSO TROPICAL UPDATE) A PRODUCT ISSUED REGULARLY BY THE DUBLIN COFFMAN HURRICANE CENTER DURINING THE NORTHERN HEMISPHERE HURRICANE, TYPHOON, AND CYCLONIC STORM SEASONS, WHICH COLLECTIVELY TAKE PLACE MAINLY FROM MAY THROUGH DECEMBER.


TROPICAL WIND ADVISORY (TRW-A)
(ISSUED BY THE DCWS HURRICANE CENTER; SEE ALSO TROPICAL STORM WARNING) TROPICAL DEPRESSION CONDITIONS ARE EXPECTED, IMMINENT, OR OCCURRING IN YOUR COASTAL, MARINE, OR INLAND AREA WITHIN 36 HOURS.


TROPICAL UPDATE (TRP-U)
1. (ISSUED BY THE DUBLN COFFMAN HURRICANE CENTER; SEE ALSO TROPICAL WEATHER OUTLOOK) ANOTHER NAME FOR THE TROPICAL WEATHER OUTLOOK.
2. (SEE ALSO STORM ALERT, TROPICAL ALERT MODE) A UPDATE VIDEO CREATED TO GIVE THE PUBLIC INFORMATION ABOUT EXISTING AND FORECAST TROPICAL SYSTEMS.


TS
(ABBR.) TROPICAL STORM
(ABBR.) THUNDERSTORM


TSUNAMI
A FLASH FLOOD OF COASTAL AREAS CAUSED BY RAPID DISPLACEMENT OF A LARGE VOLUME OF WATER. SUCH DISPLACEMENT CAN BE INDUCED BY AN EARTHQUAKE OR BY OBJECTS (E.G. LANDSLIDES, METEORS, AVALANCHES, ETC) LANDING IN THE WATER.


TSUNAMI ADVISORY (TSU-A)
FLOODING OF BEACH AREAS IS LIKELY IN YOUR AREA AS A RESULT OF A TSUNAMI.


TSUNAMI WARNING (TSU-W)
WIDESPREAD FLOODING OF COASTAL AREAS IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA AS A RESULT OF A TSUNAMI. IN EFFECT A FLASH FLOOD WARNING FOR THE COAST, RATHER THAN A RIVER OR STREAM.


TSUNAMI WATCH (TSU-WA)
FLOODING OF COASTAL AND/OR BEACH AREAS IS POSSIBLE IN YOUR AREA AS A RESULT OF A TSUNAMI.


TSUNAMOGENESIS
THE FORMATION OF A TSUNAMI.


TSUNAMOLYSIS
THE DISSIPATION OF A TSUNAMI.


VOLCANIC ERUPTION WARNING (VOL-W)
A VOLCANIC ERUPTION IS EXPECTED, IMMINENT, OR OCCURRING.


VOLCANO
AN EXPLODING MOUNTAIN, OR A PATCH OF GROUND WHICH BREAKS AND BECOMES AN EXPLODING MOUNTAIN.


VOLCANOGENESIS
THE FORMATION OF AN EXPLODING MOUNTAIN.


WATERSPOUT
A VIOLENTLY ROTATING COLUMN OF AIR EXTENDING FROM A CLOUD TO THE SURFACE OF WATER. IF A WATERSPOUT MAKES LANDFALL IT BECOMES A TORNADO.


WEATHER REPORT (WX-R)
A STATEMENT DISSEMINATING CURRENT WEATHER INFORMATION SUCH AS SNOWFALL TOTALS FROM AN ONGOING SNOW EVENT OR HAIL SIZE FROM A RECENT SEVERE STORM.


WIND ADVISORY (W-A)
(SEE ALSO HIGH WIND WARNING, STORM WIND WARNING, HURRICANE FORCE WIND WARNING, EXTREME WIND WARNING) SUSTAINED WINDS OF 25-35 MPH OR GUSTS 35-58 MPH ARE POSSIBLE IN YOUR AREA.


WINTER SEASON ADVISORY (WSE-W)
(OUTSIDE OF METEOROLOGICAL WINTER ONLY) A TRANSITION TO WINTRY CONDITIONS EARLIER THAN DECEMBER 1 OR A CONTINUATION OF WINTRY CONDITIONS BEYOND MARCH 1 IS LIKELY IN YOUR AREA.


WINTER SEASON WARNING (WSE-W)
(OUTSIDE OF METEOROLOGICAL WINTER ONLY) A LASTING TRANSITION TO WINTRY CONDITIONS EARLIER THAN DECEMBER 1 OR A SIGNIFICANT CONTINUATION OF WINTRY CONDITIONS BEYOND MARCH 1 IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA, AND WINTER APPEARS TO BE STARTING EARLY.


WINTER SEASON WATCH (WSE-WA)
(OUTSIDE OF METEOROLOGICAL WINTER ONLY) A LASTING TRANSITION TO WINTRY CONDITIONS EARLIER THAN DECEMBER 1 OR A SIGNIFICANT CONTINUATION OF WINTRY CONDITIONS BEYOND MARCH 1 IS POSSIBLE IN YOUR AREA.


WINTER STORM WARNING (WS-W)
(ISSUED BY THE DCWS WINTER STORM CENTER) A DANGEROUS SEVERE WINTER STORM IS EXPECTED, IMMINENT, OR OCCURRING IN YOUR AREA. TYPICALLY WINTER STORM CONDITIONS ARE EXPECTED TO BEGIN WITHIN 36-48 HOURS OR LESS.
-FOR HEAVY SNOW
SNOW OF 4-6 INCHES WITHIN 12 HOURS OR A TOTAL OF 6 INCHES OR MORE.
-FOR HEAVY SLEET
A HALF INCH OR MORE OF SLEET
-FOR SNOW AND HEAVY SLEET
A HALF INCH OR MORE OF SLEET AND SNOW BELOW WARNING LEVEL.
-FOR SLEET AND HEAVY SNOW
SNOW OF 4-6 INCHES WITHIN 12 HOURS OR A TOTAL OF 6 INCHES OR MORE AND LESS THAN A HALF INCH OF SLEET.
-FOR HEAVY SNOW AND SLEET
SNOW OF 4-6 INCHES WITHIN 12 HOURS OR A TOTAL OF 6 INCHES OR MORE AND A HALF INCH OR MORE OF SLEET
-FOR HEAVY SNOW AND BLOWING SNOW
SNOW OF 4-6 INCHES WITHIN 12 HOURS OR A TOTAL OF 6 INCHES OR MORE, COMBINING WITH WINDS TO CREATE NEAR-BLIZZARD CONDITIONS.
-FOR SNOW AND BLOWING SNOW
SNOW COMBINING WITH WINDS TO CREATE NEAR-BLIZZARD CONDITIONS.
-FOR HEAVY SNOW AND ICE
AT LEAST A QUARTER INCH OF FREEZING RAIN AND SNOW OF 4-6 INCHES WITHIN 12 HOURS OR A TOTAL OF 6 INCHES OR MORE.
-FOR SNOW AND ICE
AT LEAST A QUARTER INCH OF FREEZING RAIN AND ENOUGH SNOW FOR THE SNOW TO BE CONSIDERED AT LEAST AS MUCH OF A HAZARD AS THE ICE. IF THE SNOW IS LESS HAZARDOUS, AN ICE STORM WARNING WILL BE ISSUED.
-FOR THE EFFECTS OF A NAMED BLIZZARD
SEVERE WINTER WEATHER SHORT OF BLIZZARD CONDITIONS ASSOCIATED WITH A NAMED BLIZZARD. MAY ALSO BE LABLED WITH ONE OF THE ABOVE IF APPLICABLE.
-FOR SNOW, SLEET, AND FREEZING RAIN
A COMBINATION OF SNOW, SLEET, AND FREEZING RAIN CAUSING SEVERE WINTER WEATHER.


WINTER STORM WATCH (WS-WA)
(ISSUED BY THE DCWS WINTER STORM CENTER) A DANGEROUS SEVERE WINTER STORM IS POSSIBLE IN YOUR AREA.


WINTER WEATHER ADVISORY (WW-A)
(ISSUED BY THE DCWS WINTER STORM CENTER) A WINTER WEATHER EVENT IS POSSIBLE IN YOUR AREA WHICH MAY CAUSE TRAVEL DIFFICULTIES.
-FOR SNOW
SNOW OF 2-4 INCHES WITHIN 12 HOURS OR A TOTAL OF 4-6 INCHES.
-FOR SLEET
A LESS THAN A HALF INCH OF SLEET
-FOR SNOW AND SLEET
SNOW, USUALLY 2-4 INCHES WITHIN 12 HOURS OR A TOTAL OF 4-6, AND A HALF INCH OR LESS OF SLEET
-FOR SNOW AND BLOWING SNOW
SNOW COMBINING WITH WINDS TO CREATE REDUCED VISIBILITY CONDITIONS.
-FOR SNOW AND FREEZING RAIN
LESS THAN A QUARTER INCH OF FREEZING RAIN AND ENOUGH SNOW FOR THE SNOW TO BE CONSIDERED AT LEAST AS MUCH OF A HAZARD AS THE ICE. IF THE SNOW IS LESS HAZARDOUS, A FREEZING RAIN ADVISORY WILL BE ISSUED.
-FOR THE EFFECTS OF A NAMED BLIZZARD OR WINTER STORM
WINTER WEATHER SHORT OF WINTER STORM CONDITIONS ASSOCIATED WITH A NAMED BLIZZARD OR WINTER STORM. MAY ALSO BE LABLED WITH ONE OF THE ABOVE IF APPLICABLE.
-FOR SNOW, SLEET, AND FREEZING RAIN
A COMBINATION OF SNOW, SLEET, AND FREEZING RAIN CAUSING HAZARDOUS WINTER WEATHER.


WINTER WEATHER STATEMENT (WW-S)
A WINTER WEATHER EVENT IS POSSIBLE IN YOUR AREA WHICH IS WORTH NOTING, BUT WILL NOT CAUSE A SIGNIFICANT HAZARD..




ZR
(ABBR.) FREEZING RAIN.