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Severe Thunderstorm Watch 218
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WW0218 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL8
   
   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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Page last modified: May 01, 2009
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