WATCHES: Severe Thunderstorm Watch Number 452

WWUS20 KWNS 301930
SEL2
SPC WW 301930
NEZ000-SDZ000-310400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 452
NWS STORM PREDICTION CENTER NORMAN OK
130 PM MDT TUE JUL 30 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTH-CENTRAL AND WESTERN NEBRASKA
WESTERN AND CENTRAL SOUTH DAKOTA

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 130 PM UNTIL
1000 PM MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER
POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES EAST
NORTHEAST OF BUFFALO SOUTH DAKOTA TO 35 MILES SOUTHEAST OF MULLEN
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON FROM THE VICINITY OF A COLD FRONT OVER NWRN
SD SWD ALONG A LEE TROUGH INTO WRN AND N-CNTRL PARTS OF NEB.
HERE...A MODERATELY UNSTABLE AIR MASS COINCIDES WITH A KINEMATIC
ENVIRONMENT FEATURING A VERTICALLY VEERING WIND PROFILE WITH
DEEP-LAYER SHEAR RANGING FROM 45-55 KT ACROSS SD TO 30-35 KT ACROSS
NEB. AS SUCH...THE POTENTIAL WILL EXIST FOR SUPERCELLS CAPABLE OF
VERY LARGE HAIL AND PERHAPS A TORNADO OR TWO /NAMELY OVER WRN SD/.
STORMS MAY COALESCE INTO SEWD-MOVING CLUSTERS BY THIS EVENING WITH A
CONTINUED RISK FOR LARGE HAIL AND DAMAGING WINDS.

AVIATION...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 550. MEAN STORM
MOTION VECTOR 30020.


...MEAD

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