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120 

WWUS20 KWNS 181944

SEL1

SPC WW 181944

COZ000-NMZ000-OKZ000-TXZ000-190300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 601

NWS STORM PREDICTION CENTER NORMAN OK

245 PM CDT SAT JUL 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHEAST COLORADO

       LARGE PART OF EASTERN NEW MEXICO

       PARTS OF OKLAHOMA PANHANDLE

       PARTS OF TEXAS PANHANDLE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 245 PM UNTIL

1000 PM CDT.



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 95

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH

NORTHWEST OF LA JUNTA COLORADO TO 65 MILES SOUTH OF CANNON AFB

NEW MEXICO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER/INTENSITY

OVER HIGHER TERRAIN AND MOVE SEWD ACROSS THE HIGH PLAINS.  40-50KT

OF DEEP LAYER SHEAR...STEEP LAPSE RATES AND MLCAPES TO 1500 J/KG

SUPPORT SUPERCELL POTENTIAL.  LARGE HAIL AND DOWNBURSTS WINDS WILL

BE ASSOCIATED WITH ANY SUPERCELL AND AS STORMS DEVELOP INTO

CLUSTERS...WIND DAMAGE WILL INCREASE BY THIS EVENING AS ACTIVITY

DEVELOPS SEWD ACROSS THE WATCH



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 550. MEAN STORM

MOTION VECTOR 33025.





...HALES

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