WATCHES: Severe Thunderstorm Watch Number 612

WWUS20 KWNS 082149
SEL2
SPC WW 082149
COZ000-KSZ000-NEZ000-SDZ000-090500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 612
NWS STORM PREDICTION CENTER NORMAN OK
350 PM MDT FRI JUL 8 2011

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

NORTHEAST COLORADO
NORTHWEST KANSAS
WESTERN NEBRASKA INCLUDING THE PANHANDLE
WESTERN AND CENTRAL SOUTH DAKOTA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 350 PM UNTIL
1100 PM MDT.

HAIL TO 2 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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHWEST OF
LEMMON SOUTH DAKOTA TO 40 MILES SOUTH SOUTHWEST OF BURLINGTON
COLORADO. 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.

OTHER WATCH INFORMATION...CONTINUE...WW 610...WW 611...

DISCUSSION...MULTIPLE CLUSTERS OF SEVERE TSTMS ARE EXPECTED TO
EVOLVE THIS EVENING AS ONGOING STORMS MOVE/DEVELOP EWD INTO A
MODERATELY UNSTABLE AIR MASS WHERE MLCAPE HAS INCREASED TO 2000-3000
J/KG. AREA VAD/PROFILER DATA SHOW THE PRESENCE OF 25-35 KT WSWLY
MIDLEVEL FLOW ATOP SELY BOUNDARY-LAYER WINDS...RESULTING IN
SUFFICIENT VERTICAL SHEAR FOR ORGANIZED MULTICELLS AND SUPERCELLS.
LARGE HAIL WILL BE THE PRIMARY HAZARD OVER THE HIGH PLAINS THIS
EVENING WITH THE DAMAGING WIND THREAT INCREASING THIS EVENING INTO
TONIGHT AS STORMS COALESCE INTO LARGE CLUSTERS AND GROW COLD POOLS.

AVIATION...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 27030.

...MEAD

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