WATCHES: Severe Thunderstorm Watch Number 515

WWUS20 KWNS 072224
SEL5
SPC WW 072224
MTZ000-NDZ000-SDZ000-WYZ000-080500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 515
NWS STORM PREDICTION CENTER NORMAN OK
420 PM MDT SAT SEP 7 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEASTERN MONTANA
SOUTHWESTERN NORTH DAKOTA
NORTHWESTERN SOUTH DAKOTA
NORTHEASTERN WYOMING

* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 420 PM UNTIL
1100 PM MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75
MPH POSSIBLE
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 140
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST
NORTHEAST OF BAKER MONTANA TO 90 MILES SOUTH OF BUFFALO SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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...INITIALLY ISOLATED STG-SVR TSTMS OVER SERN MT ARE
BECOMING EMBEDDED WITHIN LARGER CLUSTER OF INTENSIFYING CONVECTION
ALONG/AHEAD OF ITS OUTFLOW BOUNDARY. ITS AGGREGATE WIND/HAIL THREAT
SHOULD BE FOCUSED ESEWD WITHIN BAROCLINIC ZONE...ROUGHLY INVOF US-12
ACROSS NWRN SD AND SWRN ND. ADDITIONAL SVR CONVECTION MAY FORM
ALONG OUTFLOW/CONVERGENCE BOUNDARIES EVIDENT IN VIS IMAGERY OVER
NERN WY...AND TRAILING FROM MT CLUSTER BACK INTO ROSEBUD COUNTY.
REF SPC MESOSCALE DISCUSSION 1851 FOR ADDITIONAL METEOROLOGICAL
DETAILS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 28025.


...EDWARDS

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