Severe Local Storm Watch and Watch Cancellation Msg
Issued by NWS

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000
WWUS20 KWNS 240822
SEL8
SPC WW 240822
MTZ000-NDZ000-241600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 438
NWS STORM PREDICTION CENTER NORMAN OK
320 AM CDT THU JUL 24 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
  EASTERN MONTANA
  WESTERN AND NORTHERN NORTH DAKOTA

* EFFECTIVE THIS THURSDAY MORNING FROM 320 AM UNTIL 1100 AM CDT.

* PRIMARY THREATS INCLUDE...
  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 125
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF
WILLISTON NORTH DAKOTA TO 15 MILES SOUTHWEST OF DICKINSON NORTH
DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 437...

DISCUSSION...LOOSELY-ORGANIZED SQLN NOW IN NE MT EXPECTED TO
CONTINUE GENERALLY EWD. WHILE THE STORMS MAY BECOME INCREASINGLY
ELEVATED WITH EWD EXTENT...THEY MAY REMAIN STRONG TO SVR AS SUPPORT
IS PROVIDED BY /1/ WEAK IMPULSE TOPPING UPR RIDGE...AND /2/
STRENGTHENING 850 MB WAA/MOISTURE TRANSPORT. AS THE UPR IMPULSE
CONTINUES ENEWD INTO ND LATER THIS MORNING...ADDITIONAL STORMS MAY
FORM ATOP THE FRONTAL SFC OVER WRN AND NRN PARTS OF THAT STATE.
GIVEN DEGREE OF EXPECTED ELEVATED BUOYANCY /2500 J PER KG/
ASSOCIATED WITH DEEP EML...AND SIZABLE CLOUD-LAYER SHEAR...THESE
STORMS ALSO MAY BECOME SVR...MAINLY WITH A RISK FOR LARGE HAIL.

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 28025.


...CORFIDI



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