SEL8
SPC WW 010054
OKZ000-010600-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 218
NWS STORM PREDICTION CENTER NORMAN OK
755 PM CDT THU APR 30 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND NORTHWEST OKLAHOMA
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 755 PM
UNTIL 100 AM CDT.
HAIL TO 3 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 40
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH
SOUTHWEST OF GAGE OKLAHOMA TO 20 MILES SOUTHEAST OF CHANDLER
OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
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 217...
DISCUSSION...SCATTERED THUNDERSTORMS HAVE BEGUN TO FORM OVER
NORTHWEST OK ALONG A WEAK OUTFLOW BOUNDARY. THESE STORMS MAY TRACK
SOUTHEASTWARD INTO CENTRAL OK THROUGH THE EVENING. A VERY
MOIST/UNSTABLE AIRMASS AND SUFFICIENT EFFECTIVE SHEAR SUGGEST A RISK
OF SUPERCELLS CAPABLE OF VERY LARGE HAIL AND DAMAGING WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 28025.
...HART
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