WATCHES: Tornado Watch Number 312

WWUS20 KWNS 311805
SEL2
SPC WW 311805
COZ000-KSZ000-NEZ000-010100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 312
NWS STORM PREDICTION CENTER NORMAN OK
1205 PM MDT THU MAY 31 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

EASTERN COLORADO
WESTERN KANSAS
SOUTHWEST NEBRASKA

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1205 PM UNTIL
700 PM MDT.

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 135 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHEAST OF IMPERIAL
NEBRASKA TO 75 MILES SOUTH SOUTHEAST OF BURLINGTON COLORADO. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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.

DISCUSSION...STRONG/SEVERE STORMS CONTINUE IN ALLEY OF FAVORABLE
MOISTURE CONVERGENCE AS A MID/UPPER LEVEL SHORTWAVE TROUGH BEGINS TO
MOVE SEWD FROM SERN WY. AIR MASS CONTINUES TO DESTABILIZE AS MUCAPE
VALUES ARE BETWEEN 100-2000 J/KG. DEEP LAYER IS ALSO ON THE
INCREASE AT 50-60 KT FROM CENTRAL CO INTO W CENTRAL KS JUST AHEAD OF
MID LEVEL JET EXIT REGION. EXPECT MORE STORM DEVELOPMENT NEXT
SEVERAL HOURS ACROSS THIS AREA AHEAD OF SHORTWAVE TROUGH/MID LEVEL
JET EXIT REGION AS AIR MASS CONTINUES TO DESTABILIZE AND LOW LEVEL
JET BECOMES MORE DEFINED BETWEEN NOW AND 00Z.

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
450. MEAN STORM MOTION VECTOR 27030.

..MCCARTHY

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