Sunday, June 16, 2013

WATCHES: Severe Thunderstorm Watch Number 316

WWUS20 KWNS 161908
SEL6
SPC WW 161908
NEZ000-SDZ000-170200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 316
NWS STORM PREDICTION CENTER NORMAN OK
205 PM CDT SUN JUN 16 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN AND CENTRAL NEBRASKA
EXTREME SOUTHWESTERN SOUTH DAKOTA

* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 205 PM UNTIL
900 PM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF
VALENTINE NEBRASKA TO 35 MILES EAST OF MCCOOK NEBRASKA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

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...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE
ALONG AN OUTFLOW BOUNDARY OVER EXTREME SOUTHWESTERN SOUTH DAKOTA AND
NORTHWESTERN NEBRASKA. ACTIVITY WILL THEN SPREAD SOUTHEASTWARD
ACROSS THE REMAINDER OF WESTERN NEBRASKA INTO PORTIONS OF CENTRAL
NEBRASKA. SUPERCELLS WILL BE POSSIBLE INITIALLY...BUT UPSCALE GROWTH
INTO AN MCS IS EXPECTED LATER THIS AFTERNOON INTO THE EVENING. LARGE
HAIL AND DAMAGING WIND GUSTS WILL BE THE PRIMARY THREATS...BUT A
TORNADO OR TWO WILL ALSO BE POSSIBLE ALONG AN OUTFLOW BOUNDARY OVER
WESTERN AND NORTH CENTRAL NEBRASKA.

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 500. MEAN STORM
MOTION VECTOR 33030.


...THOMPSON

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