WATCHES: Severe Thunderstorm Watch Number 413

WWUS20 KWNS 132055
SEL3
SPC WW 132055
MTZ000-NDZ000-SDZ000-WYZ000-140500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 413
NWS STORM PREDICTION CENTER NORMAN OK
250 PM MDT SAT JUL 13 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
FAR EASTERN MONTANA
WESTERN AND CENTRAL NORTH DAKOTA
WESTERN SOUTH DAKOTA
NORTHEAST WYOMING

* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 250 PM UNTIL
1100 PM MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO
2.5 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 65 MILES NORTHWEST OF
MINOT NORTH DAKOTA TO 20 MILES WEST SOUTHWEST OF RAPID CITY SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 412...

DISCUSSION...TSTMS EXPECTED TO FORM IN THE NEXT 1-2 HOURS ALONG LEE
TROUGH IN FAR ERN MT/NE WY. OTHER STORMS MAY DEVELOP SWD INTO NW ND
FROM ACTIVITY NOW IN SE SK....WHILE ADDITIONAL STORMS MOVE AND
DEVELOP NEWD FROM THE BLACK HILLS. AMPLE DEEP SHEAR AND INSTABILITY
APPEAR PRESENT FOR SUPERCELLS WITH LARGE HAIL AND DMGG
WIND...ESPECIALLY IN WRN ND WHERE ASCENT WILL BE FOSTERED BY
GLANCING INFLUENCE OF SHORTWAVE IMPULSE NOW IN SW SK. A WEAKER
UPR-LVL DISTURBANCE NOW ENTERING WRN WY...AND TERRAIN
CIRCULATIONS...MAY FOSTER CONTINUED STORM DEVELOPMENT NEAR THE BLACK
HILLS. WHILE LOW-LVL SHEAR IS NOT STRONG THROUGHOUT THE WW...IT MAY
PROVE SUFFICIENT FOR LOW-LVL MESOCYCLONE DEVELOPMENT AND POSSIBLE
TORNADOES IN ND ...GIVEN PRESENCE OF A SUSTAINED...DISCRETE
SUPERCELL.

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 25030.


...CORFIDI

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