WATCHES: Severe Thunderstorm Watch Number 506

WWUS20 KWNS 302058
SEL6
SPC WW 302058
NDZ000-310400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 506
NWS STORM PREDICTION CENTER NORMAN OK
300 PM MDT FRI AUG 30 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN NORTH DAKOTA

* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
1000 PM MDT.

* 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

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH
NORTHWEST OF MINOT NORTH DAKOTA TO 60 MILES SOUTH SOUTHEAST OF
DICKINSON NORTH DAKOTA. 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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 504...WW 505...

DISCUSSION...INCREASING CUMULUS IS INDICATED IN A N-S BAND ACROSS
WRN ND...NEAR A PRE-FRONTAL TROUGH AND AHEAD OF THE MAIN COLD FRONT
ADVANCING FROM THE NORTHWEST. WITH MODERATE DESTABILIZATION HAVING
YIELDED A FAVORABLE ENVIRONMENT FOR STORM DEVELOPMENT...AND WITH
MODERATE MID-LEVEL FLOW SUPPORTIVE OF STORM
SUSTENANCE/ORGANIZATION...EXPECT STORM DEVELOPMENT AND SUBSEQUENT
INCREASE OVER THE NEXT 1-2 HOURS. PRIMARY SEVERE THREATS WILL BE
LARGE HAIL AND DAMAGING WINDS...AS STORMS SPREAD EWD THROUGH THE
EVENING HOURS.

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 28030.


...GOSS

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