WATCHES: Severe Thunderstorm Watch Number 296

WWUS20 KWNS 111913
SEL6
SPC WW 111913
MTZ000-WYZ000-120300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 296
NWS STORM PREDICTION CENTER NORMAN OK
110 PM MDT TUE JUN 11 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN AND EASTERN MONTANA
NORTHEAST WYOMING

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 110 PM UNTIL
900 PM MDT.

* PRIMARY THREATS INCLUDE...
NUMEROUS LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL
EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75
MPH POSSIBLE
A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 115
STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES NORTH
NORTHWEST OF MILES CITY MONTANA TO 65 MILES SOUTHWEST OF GILLETTE
WYOMING. 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.

&&

DISCUSSION...TSTMS EXPECTED TO FORM OVER THE HIGHER TERRAIN OF NRN
WY AND SRN MT DURING THE NEXT FEW HOURS IN RESPONSE TO CONTINUED SFC
HEATING...PERSISTENT LOW-LVL MOISTURE INFLOW...AND ASCENT ASSOCIATED
WITH PASSING UPR-LVL TROUGH. CURRENT AND FORECAST WIND PROFILES AND
THERMODYNAMIC DATA APPEAR FAVORABLE FOR SUPERCELLS WITH VERY LARGE
HAIL AND LOCALLY DMGG WIND...ESPECIALLY IN SE MT AND NE WY. IN THE
LATTER AREA...AN INCREASING RISK FOR TORNADOES IS ALSO EXPECTED AS
LOW-LVL MOISTURE CONTINUES TO INCREASE BENEATH STRENGTHENING MID-LVL
COLD ADVECTION AND ASCENT. THIS PART OF THE WW LIKELY WILL REQUIRE
UPGRADE TO TORNADO A BIT LATER THIS AFTN.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 29020.


...CORFIDI

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