PDS Severe Thunderstorm Watch in OK; Derecho likely
Posted: Thu Jun 16, 2005 9:37 pm
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 491
NWS STORM PREDICTION CENTER NORMAN OK
930 PM CDT THU JUN 16 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
MUCH OF OKLAHOMA
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 930 PM UNTIL
500 AM CDT.
...THIS IS A PARTICULARLY DANGEROUS SITUATION...
EXTREMELY DAMAGING THUNDERSTORM WIND GUSTS TO 90 MPH...LARGE HAIL
TO 2 INCHES IN DIAMETER...AND DANGEROUS LIGHTNING ARE POSSIBLE IN
THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH
SOUTHWEST OF GAGE OKLAHOMA TO 40 MILES NORTH NORTHEAST OF
MCALESTER OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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.
OTHER WATCH INFORMATION...CONTINUE...WW 487...WW 488...WW 489...WW
490...
DISCUSSION...INTENSE LINE OF THUNDERSTORMS OVER NORTHWEST OK WILL
TRACK SOUTHEASTWARD ACROSS THE STATE DURING THE NEXT SEVERAL HOURS.
STORMS HAVE ORGANIZED INTO MULTIPLE BOW ECHOES...AND WILL LIKELY
MAINTAIN INTENSITY THROUGH THE EARLY MORNING HOURS. GIVEN EXTREME
INSTABILITY AND MESOSCALE ORGANIZATION OF STORMS...POTENTIAL EXISTS
FOR A DERECHO WITH WIDESPREAD DAMAGING WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 80
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 31040.
