WATCHES: Severe Thunderstorm Watch Number 72

WWUS20 KWNS 212047
SEL2
SPC WW 212047
COZ000-NMZ000-OKZ000-TXZ000-220300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 72
NWS STORM PREDICTION CENTER NORMAN OK
250 PM MDT WED APR 21 2010

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

SOUTHEAST COLORADO
NORTHEAST NEW MEXICO
THE EXTREME WESTERN OKLAHOMA PANHANDLE
EXTREME NORTHWEST TEXAS PANHANDLE

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 250 PM UNTIL
900 PM MDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES WEST
NORTHWEST OF LA JUNTA COLORADO TO 50 MILES SOUTHWEST OF DALHART
TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

DISCUSSION...WIDELY SCATTERED THUNDERSTORMS ARE DEVELOPING IN THE
ZONE OF STRONGER SURFACE HEATING AND LOW-LEVEL UPSLOPE FLOW ACROSS
NE NM/SE CO. THE ENVIRONMENT THROUGH THE EVENING WILL BE
CHARACTERIZED BY SUFFICIENT INSTABILITY AND DEEP-LAYER VERTICAL
SHEAR FOR SUPERCELLS...WITH LARGE HAIL THE PRIMARY SEVERE STORM
THREAT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 32015.

..THOMPSON

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