

000 

WWUS20 KWNS 132217

SEL9

SPC WW 132217

ARZ000-MOZ000-OKZ000-TXZ000-140600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 109

NWS STORM PREDICTION CENTER NORMAN OK

415 PM CST THU MAR 13 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ARKANSAS

       SOUTHWEST MISSOURI

       EASTERN OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS THURSDAY AFTERNOON FROM 415 PM UNTIL MIDNIGHT CST.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES WEST

NORTHWEST OF MONETT MISSOURI TO 45 MILES SOUTHEAST OF PARIS

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...SLIGHTLY ELEVATED TSTMS...INCLUDING POSSIBLE

SUPERCELLS...EXPECTED TO DEVELOP/INCREASE IN COVERAGE OVER WW AREA

THROUGH LATE TONIGHT AS WRN OK/NW TX MID-LEVEL VORT CONTINUES EWD.

ASSOCIATED MID-LEVEL COLD ADVECTION...AND GRADUALLY INCREASING

LOW-LEVEL MOISTURE... SUGGEST THAT SUFFICIENT DESTABILIZATION WILL

OCCUR TO EVENTUALLY SUPPORT NEAR-SFC-BASED STORMS.  COUPLED WITH EML

SWEEPING EWD ON S SIDE OF VORT...SOME STORMS COULD YIELD LARGE HAIL

AND...POSSIBLY...HIGH WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 25030.





...CORFIDI



000 

WWUS20 KWNS 132217 CCA

SEL9

SPC WW 132217 CCA

ARZ000-MOZ000-OKZ000-TXZ000-140600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 109...CORRECTED

NWS STORM PREDICTION CENTER NORMAN OK

515 PM CDT THU MAR 13 2008



CORRECTED FOR CDT...NOT CST



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ARKANSAS

       SOUTHWEST MISSOURI

       EASTERN OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS THURSDAY EVENING FROM 515 PM UNTIL 1 AM CDT FRIDAY.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES WEST

NORTHWEST OF MONETT MISSOURI TO 45 MILES SOUTHEAST OF PARIS

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...SLIGHTLY ELEVATED TSTMS...INCLUDING POSSIBLE

SUPERCELLS...EXPECTED TO DEVELOP/INCREASE IN COVERAGE OVER WW AREA

THROUGH LATE TONIGHT AS WRN OK/NW TX MID-LEVEL VORT CONTINUES EWD.

ASSOCIATED MID-LEVEL COLD ADVECTION...AND GRADUALLY INCREASING

LOW-LEVEL MOISTURE... SUGGEST THAT SUFFICIENT DESTABILIZATION WILL

OCCUR TO EVENTUALLY SUPPORT NEAR-SFC-BASED STORMS.  COUPLED WITH EML

SWEEPING EWD ON S SIDE OF VORT...SOME STORMS COULD YIELD LARGE HAIL

AND...POSSIBLY...HIGH WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 25030.





...CORFIDI

