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165 

WWUS20 KWNS 201930

SEL8

SPC WW 201930

COZ000-MTZ000-NEZ000-SDZ000-WYZ000-210300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 358

NWS STORM PREDICTION CENTER NORMAN OK

230 PM CDT SUN JUN 20 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST COLORADO

       SMALL PART OF SOUTHEAST MONTANA

       NEBRASKA PANHANDLE

       PARTS OF WESTERN SOUTH DAKOTA

       EASTERN WYOMING



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 3.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH OF BROADUS

MONTANA TO 25 MILES WEST SOUTHWEST OF LIMON COLORADO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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 356...WW 357...



DISCUSSION...AIR MASS BECOMING VERY UNSTABLE AND WEAKLY CAPPED

ACROSS ERN WY SWD ALONG FRONT RANGE TO PALMER DIVIDE.  WITH VERY

STEEP LAPSE RATES IN PLACE AND APPROACH OF MID LEVEL UPPER SYSTEM

ALONG WITH THE VEERING SHEAR PROFILES...EXPECT RAPID DEVELOPMENT OF

SEVERE THUNDERSTORMS FROM WEST TO EAST ACROSS THE WATCH.  CONDITIONS

WILL BE FAVORABLE FOR SUPERCELLS INCLUDING VERY LARGE HAIL AND

TORNADO POTENTIAL.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24025.





...HALES

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