05/26/2013 05:50 PM EDT
05/26/2013 05:50 PM EDT
WW 222 SEVERE TSTM MT WY 262150Z - 270400Z
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 F
EW 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.
...THOMPSONRead more
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