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Last Updated: 3:29 PM GMT on August 26, 2012
— Last Comment: 8:37 PM GMT on August 28, 2012
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 URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 589 NWS STORM PREDICTION CENTER NORMAN OK 830 AM EDT SUN AUG 26 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHERN FLORIDA AND FLORIDA KEYS COASTAL WATERS EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 830 AM UNTIL 500 PM EDT. TORNADOES...THUNDERSTORM WIND GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTH OF MARATHON FLORIDA TO 65 MILES NORTHEAST OF FORT MEYERS FLORIDA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9). REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. DISCUSSION...SUPERCELL/TORNADO POTENTIAL WILL INCREASE THROUGH AT LEAST MID-LATE AFTERNOON AS CENTER OF ISAAC MOVES TOWARD LOWER KEYS...STRENGTHENS FURTHER...AND LOW-LEVEL WIND FIELDS EXPAND PER LATEST NHC GUIDANCE. MEANWHILE INSTABILITY ALREADY IS FAVORABLE OVER COASTAL SE FL WITH MLCAPE GREATER THAN 1500 J/KG IN 12Z MFL RAOB. RICHEST BOUNDARY-LAYER THETAE WILL SPREAD FARTHER WWD ACROSS SRN FL WITH TIME...AS WILL PROGRESSIVELY MORE FAVORABLE LOW-LEVEL HODOGRAPHS. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 10040. ...EDWARDS
MESOSCALE DISCUSSION 1804 NWS STORM PREDICTION CENTER NORMAN OK 0233 PM CDT FRI AUG 24 2012 AREAS AFFECTED...SERN CO...SWRN KS...OK PANHANDLE...NRN TX PANHANDLE CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 241933Z - 242100Z PROBABILITY OF WATCH ISSUANCE...5 PERCENT SUMMARY...THUNDERSTORMS WILL CONTINUE TO FORM AND INCREASE IN COVERAGE OVER SERN CO...SWRN KS...THE OK PANHANDLE AND THE NRN TX PANHANDLE THIS AFTERNOON. MARGI...
MESOSCALE DISCUSSION 1801 NWS STORM PREDICTION CENTER NORMAN OK 0320 PM CDT THU AUG 23 2012 AREAS AFFECTED...WRN KS / OK PANHANDLE / NRN TX PANHANDLE CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 232020Z - 232115Z PROBABILITY OF WATCH ISSUANCE...60 PERCENT SUMMARY...ISOLD STRONG-SEVERE STORMS ARE EXPECTED TO DEVELOP LATER THIS AFTERNOON THROUGH THE EVENING HOURS. A SEVERE WATCH IS BEING CONSIDERED FOR PORTIONS OF NWRN AND...
MESOSCALE DISCUSSION 1797 NWS STORM PREDICTION CENTER NORMAN OK 0345 PM CDT TUE AUG 21 2012 AREAS AFFECTED...NORTHERN ID/WESTERN MT CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 212045Z - 212245Z PROBABILITY OF WATCH ISSUANCE...20 PERCENT SUMMARY...ISOLATED DAMAGING WIND AND POSSIBLY SOME SEVERE HAIL POTENTIAL WILL EXIST LATE THIS AFTERNOON/EARLY EVENING FROM PORTIONS OF NORTHERN ID INTO WESTERN MT. DISCUSSION...VISIB...
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