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000 

WWUS20 KWNS 080035

SEL5

SPC WW 080035

OKZ000-TXZ000-080800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 255

NWS STORM PREDICTION CENTER NORMAN OK

735 PM CDT MON MAY 7 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND EASTERN OKLAHOMA

       NORTH CENTRAL AND NORTHEAST TEXAS



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 735 PM UNTIL

300 AM CDT.



TORNADOES...HAIL TO 2 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 65 STATUTE

MILES EITHER SIDE OF A LINE FROM 35 MILES EAST NORTHEAST OF PARIS

TEXAS TO 65 MILES WEST SOUTHWEST OF ARDMORE OKLAHOMA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



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 253...WW 254...



DISCUSSION...TSTMS ARE FORMING JUST DOWNSTREAM OF APPARENT MCV NEAR

FWD.  THIS ACTIVITY IS DEVELOPING IN A DEEPLY MOIST ENVIRONMENT OF

MODERATE 0-6 KM SHEAR.  LOW LEVEL DIRECTIONAL SHEAR IS ENHANCED JUST

NE OF MCV...WHERE NEAR-SFC FLOW REMAINS BACKED N OF WSW/ENE ORIENTED

OUTFLOW BOUNDARY ACROSS N TX.  EXPECT STORMS TO INCREASE IN COVERAGE

AS LLJ NOCTURNALLY STRENGTHENS.  EMBEDDED SUPERCELLS MAY POSE A

THREAT FOR TORNADOES...GIVEN UPSTREAM INFLOW ENVIRONMENT OF VERY

WARM/MOIST AIR...AND BACKED FLOW N OF OUTFLOW BOUNDARY.



AVIATION...TORNADOES AND 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

500. MEAN STORM MOTION VECTOR 22025.





...CORFIDI

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