WATCHES: Severe Thunderstorm Watch Number 401

WWUS20 KWNS 082204
SEL1
SPC WW 082204
MTZ000-SDZ000-WYZ000-090500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 401
NWS STORM PREDICTION CENTER NORMAN OK
400 PM MDT MON JUL 8 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEAST MONTANA
WESTERN SOUTH DAKOTA
NORTHEAST WYOMING

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 400 PM UNTIL
1100 PM MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL VERY LARGE HAIL EVENTS TO 4 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 95
STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH OF
MILES CITY MONTANA TO 75 MILES SOUTH SOUTHEAST OF GILLETTE
WYOMING. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 398...WW 399...WW 400...

DISCUSSION...WIDESPREAD THUNDERSTORMS INCLUDING EMBEDDED SUPERCELLS
ARE ONGOING ATTM ACROSS THE NRN INTERMOUNTAIN REGION AND ADJACENT
NORTHERN HIGH PLAINS...WITH THE MOST INTENSE STORMS OVER CENTRAL AND
EASTERN MONTANA. WITH THE AXIS OF GREATEST INSTABILITY EXTENDING
SSEWD ACROSS SOUTHEASTERN MT/NORTHEASTERN WY AND INTO PARTS OF
WESTERN SOUTH DAKOTA...EXPECT STORMS TO CONTINUE MOVING
EASTWARD/EAST-SOUTHEASTWARD ACROSS THIS AREA. SHEAR REMAINS
SUPPORTIVE OF SEVERE/SUPERCELL STORMS...AND MAY INCREASE WITH TIME
AS A MID-LEVEL JET STREAK SHIFTS EWD ACROSS THE NORTHERN
INTERMOUNTAIN REGION. GIVEN THE FAVORABLE SHEAR AND MODERATE
INSTABILITY...VERY LARGE HAIL AND STRONG/DAMAGING WIND GUSTS ARE
EXPECTED WITH THE MOST INTENSE STORMS OVER THE NEXT SEVERAL HOURS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 4 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 28035.


...GOSS

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