WATCHES: Severe Thunderstorm Watch Number 222

WWUS20 KWNS 262147
SEL2
SPC WW 262147
MTZ000-WYZ000-270400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 222
NWS STORM PREDICTION CENTER NORMAN OK
350 PM MDT SUN MAY 26 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF CENTRAL AND SOUTHEAST MONTANA
NORTHEAST WYOMING

* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 350 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
A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHEAST OF
LEWISTOWN MONTANA TO 60 MILES SOUTH SOUTHWEST OF BROADUS MONTANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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...ONGOING STORMS FROM CENTRAL MT INTO NE WY ARE EXPECTED
TO INTENSIFY SOME THE NEXT FEW HOURS AS SURFACE HEATING CONTINUES IN
THE DOWNSTREAM AIR MASS...AND ADDITIONAL STORMS WILL LIKELY DEVELOP
AS THIS AREA IS BRUSHED BY AN EJECTING SPEED MAX OVER THE NRN
ROCKIES. THE COMBINATION OF MODERATE INSTABILITY AND SUFFICIENT
VERTICAL SHEAR WILL SUPPORT THE RISK FOR A FEW SUPERCELLS WITH LARGE
HAIL THE NEXT FEW HOURS. LATER THIS EVENING...STORM MERGERS COULD
LEAD TO THE GROWTH OF A CLUSTER OR LINE SEGMENTS...WITH THE RISK FOR
DAMAGING WINDS.

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 26025.


...THOMPSON

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