Severe Thunderstorm Watch (Nebraska, South Dakota)

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URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 462
NWS STORM PREDICTION CENTER NORMAN OK
125 PM MDT SUN AUG 17 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

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

* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 125 PM UNTIL
900 PM MDT.

* PRIMARY THREATS INCLUDE…
SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
TO 2 INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES EAST
NORTHEAST OF BUFFALO SOUTH DAKOTA TO 35 MILES SOUTH OF BROKEN BOW
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…STORMS ARE INCREASING FROM EXTREME SRN SD INTO FAR NRN
NEB AS AN OUTFLOW BOUNDARY INTERSECTS A LOW-LEVEL MOISTURE
FEED…WHILE ADDITIONAL STORMS ARE DEVELOPING OVER THE BLACK HILLS
AND INTO FAR NWRN SD. THE AIR MASS IS DESTABILIZING OVER WRN SD IN
THE WAKE OF EARLIER STORMS…WITH STRONG INSTABILITY NOTED SWD INTO
NEB WHERE MLCAPE REACHES 2500-3000 J/KG. SUFFICIENT VERTICAL SHEAR
/30-40 KT IN THE LOWEST 6 KM AGL/ OVER THE AREA IN ADVANCE OF A
SUBTLE SHORT WAVE TROUGH ADVANCING EWD ACROSS MT AND WY WILL ENHANCE
SEVERE POTENTIAL. STRONGER STORMS INCLUDING A FEW SUPERCELLS WILL
BE CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS…WITH
THE THREAT SPREADING SEWD THROUGH THE EVENING HOURS.

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Posted on August 17, 2014, in Nebraska, Severe Thunderstorm Watch, South Dakota and tagged , , , , , . Bookmark the permalink. Leave a comment.

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