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564 

WWUS20 KWNS 062007

SEL5

SPC WW 062007

COZ000-NEZ000-WYZ000-070200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 555

NWS STORM PREDICTION CENTER NORMAN OK

205 PM MDT MON JUL 6 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTH CENTRAL AND NORTHEASTER COLORADO

       WESTERN PORTIONS OF THE NEBRASKA PANHANDLE

       PARTS OF EAST CENTRAL AND SOUTHEAST WYOMING



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 800

PM MDT.



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 45 MILES EAST

NORTHEAST OF DOUGLAS WYOMING TO 45 MILES WEST SOUTHWEST OF LIMON

COLORADO.  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 553...WW 554...



DISCUSSION...CONVECTION CONTINUES TO INCREASE ACROSS THE CENTRAL

ROCKIES AHEAD OF A VIGOROUS MID-LEVEL SHORT-WAVE TROUGH CROSSING THE

NORTHERN INTERMOUNTAIN REGION ATTM.  NWWD ADVECTION OF UPPER 50S TO

LOW 60S SURFACE DEWPOINTS INTO THE HIGH PLAINS COMBINED WITH DAYTIME

HEATING HAVE RESULTED IN MODERATE DESTABILIZATION...WHICH WILL

SUPPORT AN INTENSIFICATION OF STORMS MOVING SEWD OFF THE HIGHER

TERRAIN.

STORM INTENSIFICATION WILL ALSO BE AIDED BY INCREASING MID-LEVEL

FLOW WITH TIME...CONTRIBUTING TO SHEAR SUFFICIENT FOR MULTICELL

ORGANIZATION -- AND EVENTUALLY PERHAPS SOME MID-LEVEL UPDRAFT

ROTATION.  ALONG WITH THE THREAT FOR LARGE HAIL...LOCALLY

STRONG/GUSTY WINDS WILL BE POSSIBLE.



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 450. MEAN STORM

MOTION VECTOR 30025.





...GOSS

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