

587 

WWUS20 KWNS 221946

SEL2

SPC WW 221946

OKZ000-TXZ000-230300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 702

NWS STORM PREDICTION CENTER NORMAN OK

245 PM CDT FRI OCT 22 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST AND SOUTH-CENTRAL OKLAHOMA

       NORTHWEST TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 245 PM UNTIL

1000 PM 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 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 130 MILES WEST SOUTHWEST OF

WICHITA FALLS TEXAS TO 75 MILES EAST OF WICHITA FALLS TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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.



DISCUSSION...TSTMS DEVELOPING INVOF DRYLINE/OUTFLOW BOUNDARY TRIPLE

POINT ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY THIS

AFTERNOON WITHIN A MODERATELY UNSTABLE AIR MASS WITH MLCAPE OF

1000-1500 J/KG.  SOME BOUNDARY LAYER DRYING HAS BEEN NOTED IN OPEN

WARM SECTOR WHERE DEWPOINTS HAVE MIXED IN THE UPPER 50S.

HOWEVER...LOCAL ENVIRONMENT INVOF OUTFLOW BOUNDARY IS LIKELY

CHARACTERIZED BY COOLER AND MORE MOIST CONDITIONS...YIELDING LOWER

LCL HEIGHTS.  WHEN COUPLED WITH LOCALLY BACKED NEAR-SURFACE FLOW AND

40-50 KT OF DEEP-LAYER SHEAR...SETUP APPEARS FAVORABLE FOR THE

DEVELOPMENT OF A FEW SUPERCELLS CAPABLE OF LARGE HAIL AND A COUPLE

TORNADOES.



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 24030.





...MEAD

