

050 

WWUS20 KWNS 282053

SEL6

SPC WW 282053

MTZ000-WYZ000-290400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 196

NWS STORM PREDICTION CENTER NORMAN OK

250 PM MDT WED MAY 28 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND SOUTHERN MONTANA

  NORTHERN WYOMING



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 250 PM

  UNTIL 1000 PM MDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 130

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH

NORTHEAST OF HARLOWTON MONTANA TO 75 MILES SOUTH OF BILLINGS

MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 195...



DISCUSSION...HIGH-BASED TSTMS FORMING OVER THE HIGHER TERRAIN OF NRN

CNTRL/NRN WY...WITH A AN ATTENDANT RISK FOR ISOLD DMGG

WIND...EXPECTED TO MOVE/DEVELOP NEWD INTO LESS DEEPLY-MIXED

ENVIRONMENT OVER SRN MT. STORM BASES MAY LOWER IN THIS REGION...WITH

AN INCREASING RISK FOR SVR HAIL AND A CONTINUING RISK FOR DMGG WIND.

OTHER STRONG TO SVR STORMS EXPECTED TO FORM OVER THE HIGHER TERRAIN

AND INVOF COLD FRONT SW OF HELENA IN W CNTRL MT. THIS ACTIVITY

SHOULD MOVE RAPIDLY NNE ALONG/AHEAD OF THE FRONT. STRENGTHENING WIND

FIELD IN THIS REGION ALSO SUGGESTS THE LIKELIHOOD FOR DMGG WIND.

THE SRN MT STORMS LIKELY WILL EVOLVE INTO SUPERCELLS AS THEY

CONTINUE NEWD AND ENCOUNTER MOIST AXIS/ZONE OF ENHANCED LOW-LVL

DIRECTIONAL SHEAR ALONG DEVELOPING WARM FRONT LYING WNW-ESE THROUGH

THE CNTRL PART OF THE STATE. THESE STORMS COULD YIELD

TORNADOES...VERY LARGE HAIL...AND MORE WIDESPREAD DMGG WIND...LIKELY

REQUIRING THE ADDITION OF A TORNADO WATCH TO THE N OF THE PRESENT

SVR WW LATER THIS EVE.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

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

MOTION VECTOR 21035.





...CORFIDI

