

990 

WWUS20 KWNS 311013

SEL0

SPC WW 311013

ARZ000-OKZ000-TXZ000-311700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 70

NWS STORM PREDICTION CENTER NORMAN OK

510 AM CDT SUN MAR 31 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHWESTERN ARKANSAS

       PARTS OF SOUTHERN OKLAHOMA OKLAHOMA

       NORTH CENTRAL AND NORTHEAST TEXAS



EFFECTIVE THIS SUNDAY MORNING FROM 510 AM UNTIL NOON 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 90

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH OF

WICHITA FALLS TEXAS TO 30 MILES SOUTH SOUTHEAST OF TEXARKANA

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...AN INTENSIFYING AND INCREASINGLY ORGANIZED CLUSTER OF

THUNDERSTORMS WILL CONTINUE TO DEVELOP SOUTHEASTWARD THROUGH PARTS

OF THE RED RIVER VALLEY THIS MORNING.  THE RISK FOR SEVERE HAIL WILL

CONTINUE IN STRONGER CELLS...WITH POTENTIAL FOR DAMAGING WIND GUSTS

ALSO INCREASING...ESPECIALLY AS SURFACE TEMPERATURES BEGIN TO WARM

AHEAD OF IT AFTER DAYBREAK.  ADDITIONAL STRONG/SEVERE STORMS MAY

DEVELOP IN ADVANCE OF THE CONVECTIVE SYSTEM...ACROSS NORTH CENTRAL

AND NORTHEAST TEXAS.



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 450. MEAN STORM

MOTION VECTOR 29035.





...KERR

