

112 

WWUS20 KWNS 182313

SEL9

SPC WW 182313

MTZ000-NDZ000-SDZ000-WYZ000-190600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 159

NWS STORM PREDICTION CENTER NORMAN OK

515 PM MDT SUN MAY 18 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN MONTANA

  WESTERN NORTH DAKOTA

  WESTERN SOUTH DAKOTA

  NORTHEASTERN WYOMING



* EFFECTIVE THIS SUNDAY AFTERNOON FROM 515 PM UNTIL MIDNIGHT MDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5

    INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTHWEST OF

RAPID CITY SOUTH DAKOTA TO 55 MILES NORTH OF WILLISTON NORTH

DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 158...



DISCUSSION...CONVECTION INCREASING IN AND JUST E OF WW 158...AND

MOVING INTO FAVORABLE BUOYANCY/SHEAR ENVIRONMENT FOR SUSTAINED SVR

POTENTIAL....WARRANTS ADDITIONAL WW.  SUPERCELLS AND

WIND-DAMAGE-PRODUCING BOWS ARE POSSIBLE. REF SPC MESOSCALE

DISCUSSION 616 FOR FURTHER INITIAL DETAILS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27030.





...EDWARDS

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