05/25/2013 03:55 PM EDT
WW 217 TORNADO MT ND SD WY 251955Z - 260400Z
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 217
NWS STORM PREDICTION CENTER NORMAN OK 155 PM
MDT SAT MAY 25 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* TORNADO WATCH FOR PORTIONS OF
SOUTHEAST MONTANA
SOUTHWEST NORTH DAKOTA
WESTERN AND CENTRAL SOUTH DAKOTA
NORTHEAST WYOMING
* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING
FROM 155 PM UNTIL 1000 PM MDT.
* PRIMARY THREATS INCLUDE...
SEVERAL TORNADOES POSSIBLE SEVERAL VERY LARGE
HAIL EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG
AND 115 STATUTE MILES EAST AND WEST OF A LINE
FROM 75 MILES SOUTH SOUTHEAST OF RAPID CITY
SOUTH DAKOTA TO 45 MILES NORTH NORTHEAST OF
BAKER MONTANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...
A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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
DISCUSSION...
TSTMS IN PROGRESS OVER SWRN ND/NWRN SD SHOULD CONTINUE
TO INTENSIFY THIS AFTERNOON WITH ADDITIONAL
SURFACE-BASED STORMS DEVELOPING OVER THE BLACK HILLS
AND HIGH TERRAIN OF SERN MT.
LOCAL ENVIRONMENT IS CHARACTERIZED BY STEEP LAPSE RATES...
MODERATE INSTABILITY...AND VERTICALLY VEERING WIND
PROFILES WITH 40-50 KT OF DEEP-LAYER SHEAR.
AS SUCH...THE POTENTIAL WILL EXIST FOR DISCRETE
SUPERCELLS AND BOWING STRUCTURES WITH A RISK FOR
SIGNIFICANT HAIL...A FEW TORNADOES...AND DAMAGING WINDS.
AVIATION...
TORNADOES AND 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 26020. ...MEADRead more
05/25/2013 03:55 PM EDT
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