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887 

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

