PDS issued, but of course
Posted by JAC on 5/24/2011, 2:35 pm


URGENT - IMMEDIATE BROADCAST REQUESTED
  TORNADO WATCH NUMBER 356
  NWS STORM PREDICTION CENTER NORMAN OK
  1250 PM CDT TUE MAY 24 2011
 
  THE NWS STORM PREDICTION CENTER HAS ISSUED A
  TORNADO WATCH FOR PORTIONS OF
 
         WESTERN AND CENTRAL OKLAHOMA
         NORTHWEST AND NORTH-CENTRAL TEXAS
 
  EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
  1000 PM CDT.
 
 ...THIS IS A PARTICULARLY DANGEROUS SITUATION...
 
  DESTRUCTIVE TORNADOES...LARGE HAIL TO 3 INCHES IN DIAMETER...
  THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE
  POSSIBLE IN THESE AREAS.
 
  THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
  MILES EAST AND WEST OF A LINE FROM 45 MILES WEST NORTHWEST OF
  PONCA CITY OKLAHOMA TO 25 MILES SOUTH SOUTHWEST OF FORT WORTH
  TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
  WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
 
  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.
 
  OTHER WATCH INFORMATION...CONTINUE...WW 352...WW 354...WW 355...
 
  DISCUSSION...TSTM INITIATION IS ANTICIPATED WITHIN THE NEXT HOUR OR
  TWO ALONG THE DRYLINE FROM WRN OK INTO W-CNTRL TX.  STRONG HEIGHT
  FALLS/DYNAMIC FORCING FOR ASCENT ASSOCIATED WITH NEGATIVELY TILTED
  MIDLEVEL TROUGH EMERGING INTO THE PLAINS SHOULD SUPPORT A RAPID
  INCREASE IN STORM COVERAGE THROUGH THE AFTERNOON.  WARM SECTOR AIR
  MASS IS CHARACTERIZED BY A VERY MOIST BOUNDARY LAYER WITH DEWPOINTS
  IN THE UPPER 60S TO LOWER 70S.  WHEN COUPLED WITH STEEP MIDLEVEL
  LAPSE RATES...ENVIRONMENT IS MODERATELY TO STRONGLY UNSTABLE WITH
  MLCAPE VALUES OF 2500-4000 J/KG.  DEEP-LAYER SHEAR STRENGTHENING TO
  40-50 KT WILL PROMOTE RAPID SUPERCELL DEVELOPMENT WITH THE INITIAL
  HAZARD BEING VERY LARGE HAIL.  INITIAL VEER-BACK WIND PROFILE
  OBSERVED IN CURRENT VADS/PROFILERS IS EXPECTED TO TRANSITION TO
  LARGE CLOCKWISE CURVED HODOGRAPHS BY 00Z WHERE 0-1 KM SRH WILL
  APPROACH 400-500 M2/S2.  AS SUCH...EXPECT A RAPID INCREASE IN THE
  THREAT FOR TORNADOES THIS AFTERNOON INTO EVENING...SOME OF WHICH
  COULD BE LONG-TRACKED AND STRONG TO VIOLENT.
 
  AVIATION...TORNADOES AND 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
  550. MEAN STORM MOTION VECTOR 23035.
 
 
  ...MEAD
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OK & KS Under High Risk for Severe Weather Today - JAC, 5/24/2011, 5:44 am
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