

173 

WWUS20 KWNS 200706

SEL3

SPC WW 200706

ARZ000-OKZ000-TXZ000-201400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 193

NWS STORM PREDICTION CENTER NORMAN OK

205 AM CDT THU MAY 20 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF SOUTHWEST ARKANSAS

       LARGE PART OF SOUTHEAST OKLAHOMA

       PARTS OF NORTH CENTRAL AND NORTHEAST TEXAS



EFFECTIVE THIS THURSDAY MORNING FROM 205 AM UNTIL 900 AM CDT.



HAIL TO 2 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHWEST

OF ARDMORE OKLAHOMA TO 40 MILES SOUTH SOUTHEAST OF HOT SPRINGS

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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.



DISCUSSION...THUNDERSTORMS...SOME SEVERE CONTINUE TO TRACK EWD

ACROSS SERN OK INTO AR WITH A PERSISTING SWLY FLOW OF MOIST UNSTABLE

AIR.  ADDITIONAL STRONG/SEVERE THUNDERSTORMS EXPECTED TO DEVELOP

AHEAD OF COLD FRONT AND UPPER TROUGH MOVING EWD SWRN OK/NWRN TX.

STORMS WILL FORM VICINITY RED RIVER VALLEY AND WITH MLCAPES AOA 2000

J/KG AND 40-50 KT OF SHEAR...POSE A THREAT OF LARGE HAIL AND

DAMAGING WINDS.



AVIATION...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 26030.





...HALES

