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SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 83
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT WED MAR 28 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
WESTERN KANSAS
EXTREME SOUTHWEST NEBRASKA
EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 400 PM UNTIL MIDNIGHT CDT.
TORNADOES...HAIL TO 3 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 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHWEST OF MCCOOK
NEBRASKA TO 5 MILES EAST SOUTHEAST OF LIBERAL KANSAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).
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 80...WW 81...WW 82...
DISCUSSION...LOW-LEVEL MOISTURE /BOUNDARY LAYER DEWPOINTS OF 56-62
F/ CONTINUES TO SURGE NWD/NNWWD INTO WRN KS FROM OK...TO THE E OF A
CONFLUENCE BOUNDARY FROM W OF LBL TO NEAR GLD. THE DEEPER MIXED
LAYER AND MUCH DRIER BOUNDARY LAYER IS LOCATED TO THE W ACROSS ERN
CO. THE SURFACE MOISTURE GRADIENT MAY TEND TO CONSOLIDATE THROUGH
THE EVENING ACROSS EXTREME WRN KS...PROVIDING A FOCUS FOR STORM
INITIATION. THE MOISTENING BOUNDARY LAYER AND TEMPERATURES IN THE
LOW-MID 70S WILL SUPPORT STRONG INSTABILITY /MLCAPE VALUES IN EXCESS
OF 2000 J/KG/. AT THE SAME TIME...VERTICAL SHEAR WILL BECOME
INCREASINGLY FAVORABLE FOR SUPERCELLS INTO THIS EVENING. GIVEN THAT
THE INITIAL DEVELOPMENT SHOULD BE DISCRETE SUPERCELLS ACROSS WRN
KS...WITH THE POTENTIAL FOR VERY LARGE HAIL AND A COUPLE OF STRONG
TORNADOES. LATER THIS EVENING INTO TONIGHT...STORMS MAY GRADUALLY
MERGE INTO A LARGER N-S CONVECTIVE BAND WITH MORE OF A DAMAGING WIND
AND LARGE HAIL THREAT.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 21040.
...THOMPSON
