

517 

WWUS20 KWNS 210331

SEL0

SPC WW 210331

OKZ000-TXZ000-211100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 610

NWS STORM PREDICTION CENTER NORMAN OK

1030 PM CDT MON JUL 20 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL OKLAHOMA

       THE NORTHEASTERN TEXAS PANHANDLE



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1030 PM

UNTIL 600 AM CDT.



HAIL TO 1.5 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 115

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH

NORTHWEST OF GAGE OKLAHOMA TO 20 MILES SOUTHWEST OF OKLAHOMA CITY

OKLAHOMA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 607...WW 608...WW 609...



DISCUSSION...TSTMS/SUPERCELLS NOW IN SW KS...AND ALONG CNTRL PARTS

OF THE KS/OK BORDER...SHOULD MOVE/DEVELOP GENERALLY SSE THROUGH

EARLY TUESDAY AS MID LVL NWLY FLOW STRENGTHENS AND DEEPENS IN

ASSOCIATION WITH AMPLIFYING LARGER SCALE TROUGH.  GIVEN EXISTING

THERMODYNAMIC SETUP AND EXPECTED VEERING/STRENGHTENING  OF LLJ...A

THREAT FOR ISOLD SVR HAIL/WIND SHOULD SPREAD FARTHER SSE AS ACTIVITY

EVOLVES INTO A FORWARD-PROPAGATING CLUSTER.  INCREASING CIN SHOULD

ULTIMATELY WEAKEN STORMS LATER TUESDAY MORNING.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 35030.





...CORFIDI

