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000 

WWUS20 KWNS 190552

SEL5

SPC WW 190552

OKZ000-TXZ000-191300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 575

NWS STORM PREDICTION CENTER NORMAN OK

1250 AM CDT THU JUN 19 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST OKLAHOMA

       WESTERN AND NORTHERN TEXAS



EFFECTIVE THIS THURSDAY MORNING FROM 1250 AM UNTIL 800 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 80

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

ALTUS OKLAHOMA TO 20 MILES SOUTH OF ABILENE TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



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 573...WW 574...



DISCUSSION...FORWARD-PROPAGATING MCS IN SE TX PANHANDLE EXPECTED TO

MOVE GENERALLY SSE.  CONSIDERABLE W TO E VARIATION IN MOISTURE

AVAILABILITY APPEARS TO EXIST WARM SECTOR AHEAD OF SYSTEM...LENDING

SOME QUESTION AS TO SPEED AND CHARACTER OF FORWARD PROPAGATION

DURING THE NEXT SEVERAL HOURS.  NEVERTHELESS...AREA VWP DATA WITH

25+ KT SSE LLJ...AND PRESENCE OF STEEP LAPSE RATES IN A DEEP LAYER

ABOVE NOCTURNAL INVERSION...SUGGEST POTENTIAL FOR CONTINUED SVR

THREAT WITH EMBEDDED SUSTAINED OR BRIEFLY ROTATING STORMS.



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 34030.





...CORFIDI

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