WATCHES: Tornado Watch Number 387

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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