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000 

WWUS20 KWNS 121717

SEL7

SPC WW 121717

COZ000-KSZ000-NEZ000-130000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 387

NWS STORM PREDICTION CENTER NORMAN OK

1220 PM CDT TUE JUN 12 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST COLORADO

       PARTS OF NORTHWEST KANSAS

       MUCH OF WESTERN NEBRASKA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1220 PM UNTIL

700 PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 70 MILES SOUTH OF GOODLAND

KANSAS TO 10 MILES WEST NORTHWEST OF VALENTINE NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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 384...WW 385...WW 386...



DISCUSSION...WITH A VERY MOIST/UNSTABLE AIRMASS IN PLACE AND THE

APPROACH OF THE UPPER TROUGH FROM THE SRN ROCKIES...STORMS ARE

INCREASING RAPIDLY IN WRN PORTION OF THE WATCH.  LOW LEVEL SHEAR/LOW

LCL AND STRONG INSTABILITY SUPPORT POTENTIAL FOR TORNADIC

SUPERCELLS.  INITIAL SUPERCELLS DEVELOPING NERN CO W OF GLD AND WILL

TRACK INTO SWRN NEB WITH ADDITIONAL SUPERCELL POTENTIAL DURING

AFTERNOON ACROSS WATCH.



AVIATION...TORNADOES AND 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

550. MEAN STORM MOTION VECTOR 20030.





...HALES

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