WATCHES: Severe Thunderstorm Watch Number 400

WWUS20 KWNS 082100
SEL0
SPC WW 082100
NEZ000-SDZ000-090200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 400
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT MON JUL 8 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

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

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 400 PM UNTIL
900 PM CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 85 MILES WEST
NORTHWEST OF MULLEN NEBRASKA TO 35 MILES NORTH NORTHEAST OF
ONEILL NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 398...WW 399...

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO FORM SOON OVER NORTH
CENTRAL NEB AND SOUTH CENTRAL SD...SPREADING EASTWARD ACROSS THE
WATCH AREA THROUGH THE EARLY EVENING HOURS. STRONG INSTABILITY
COUPLED WITH SUFFICIENT VERTICAL SHEAR WILL PROMOTE ORGANIZED
MULTICELL TO SUPERCELL STORMS CAPABLE OF LARGE HAIL AND DAMAGING
WINDS. STORMS WILL LIKELY ORGANIZE INTO BOWING SEGMENTS THIS
EVENING AS THEY TRACK ACROSS THE WATCH.

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 500. MEAN STORM
MOTION VECTOR 27030.


...HART

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