

126 

WWUS20 KWNS 210148

SEL9

SPC WW 210148

OKZ000-210900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 609

NWS STORM PREDICTION CENTER NORMAN OK

845 PM CDT MON JUL 20 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN AND EASTERN OKLAHOMA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 845 PM UNTIL

400 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 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF PONCA CITY

OKLAHOMA TO 5 MILES SOUTH OF MUSKOGEE OKLAHOMA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU9).



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 606...WW 607...WW 608...



DISCUSSION...SUPERCELL NOW IN EXTREME S CNTRL KS EXPECTED TO

CONTINUE SSE...WHILE ADDITIONAL STORMS FORM IN ERN OK AS LLJ

STRENGTHENS AND VEERS INVOF WARM FRONTAL SEGMENT IN THAT AREA.

INCREASING CIN WITH NIGHTFALL MAY CAUSE TO STORMS TO BECOME SLIGHTLY

ELEVATED WITH TIME...AND NEAR-SFC SHEAR WILL REMAIN MODEST.  BUT

COMBINATION OF EXISTING DISCRETE/SEMI-DISCRETE STORMS...FAVORABLY

ORIENTED BOUNDARIES...MOIST LOW-LVL ENVIRONMENT...AND STRENGTHENING

MID/UPR LVL FLOW SUGGEST POTENTIAL FOR ADDITIONAL SUSTAINED

STORMS/POSSIBLE SUPERCELLS POSING A THREAT FOR LARGE HAIL/WIND AND

ISOLD 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

550. MEAN STORM MOTION VECTOR 34030.





...CORFIDI

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