WATCHES: Tornado Watch Number 156

WWUS20 KWNS 212014
SEL6
SPC WW 212014
COZ000-KSZ000-NEZ000-220500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 156
NWS STORM PREDICTION CENTER NORMAN OK
310 PM CDT SAT APR 21 2007

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

EASTERN COLORADO
WESTERN KANSAS
SOUTHWEST NEBRASKA

EFFECTIVE THIS SATURDAY AFTERNOON FROM 310 PM UNTIL MIDNIGHT CDT.

TORNADOES...HAIL TO 2.5 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 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES WEST NORTHWEST OF
MCCOOK NEBRASKA TO 20 MILES WEST OF LIBERAL KANSAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

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 154...WW 155...

DISCUSSION...TSTMS EXPECTED TO FORM IN THE NEXT HOUR OR SO ALONG LEE
TROUGH/DRY LINE SEGMENTS IN ERN CO/NE NM. STORMS SHOULD QUICKLY
BECOME SUPERCELLS AND POSE A THREAT FOR TORNADOES/LARGE HAIL AS THEY
MOVE TOWARD HEATED/INCREASINGLY MOIST ENVIRONMENT ALONG WRN EDGE OF
STRATOCU FIELD IN WRN KS. ARRIVAL OF STRENGTHENING WIND FIELD AND
LARGE SCALE ASCENT WITH POTENT NM UPR VORT WILL FAVOR EVENTUAL
DEVELOPMENT OF BROKEN LINES OF SUPERCELLS. BUT STRENGTH OF LOW
LEVEL SHEAR AND POTENTIAL INCREASE IN SAME WITH NOCTURNAL DECOUPLING
OF LLJ MAY EXTEND TORNADO THREAT INTO MID/LATE EVENING IN ERN PARTS
OF WW.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22040.

..CORFIDI

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