

504 

WWUS20 KWNS 041933

SEL8

SPC WW 041933

COZ000-NMZ000-OKZ000-TXZ000-050300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 328

NWS STORM PREDICTION CENTER NORMAN OK

125 PM MDT THU JUN 4 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN COLORADO

       NORTHEASTERN NEW MEXICO

       WESTERN OKLAHOMA PANHANDLE

       NORTHWESTERN TEXAS PANHANDLE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 125 PM UNTIL

900 PM MDT.



HAIL TO 2.5 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHWEST OF

AKRON COLORADO TO 25 MILES SOUTH OF TUCUMCARI NEW MEXICO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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 327...



DISCUSSION...CONVECTION HAS DEVELOPED OVER THE HIGHER TERRAIN OF

COLORADO AND NRN NEW MEXICO...AND SHOULD INTENSIFY AS THE STORMS

MOVE SEWD INTO A WARMING AND DESTABILIZING AIR MASS ALONG AND EAST

OF THE FOOTHILLS. MODERATE INSTABILITY AND 30-40 KT DEEP LAYER SHEAR

WILL BE SUPPORTIVE OF SUPERCELLS. THE COMBINATION OF STEEP LAPSE

RATES AND EXPECTED MID LEVEL ROTATION IN STORMS FAVORS LARGE HAIL AS

THE MAIN THREAT. HOWEVER...A BRIEF TORNADO IS ALSO POSSIBLE ALONG

E-W ORIENTED BOUNDARY LOCATED ALONG THE PALMER DIVIDE.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 32025.





...IMY

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