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WWUS20 KWNS 232246

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SPC WW 232246

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 352

NWS STORM PREDICTION CENTER NORMAN OK

440 PM MDT SUN JUN 23 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN COLORADO



* EFFECTIVE THIS SUNDAY AFTERNOON FROM 440 PM UNTIL MIDNIGHT MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH

NORTHWEST OF AKRON COLORADO TO 50 MILES SOUTH SOUTHEAST OF LA

JUNTA COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 351...



DISCUSSION...TSTMS NOW FORMING OVER THE HIGHER TERRAIN OF CNTRL

CO...AND IN THE LEE OF THE RCKY MTN FOOTHILLS...EXPECTED TO INCREASE

AND MOVE/DEVELOP GENERALLY NEWD THROUGH LATE TNGT/EARLY MON AS

LOW-LVL SELY FLOW PERSISTS AHEAD OF APPROACHING DISTURBANCE ON SRN

FRINGE OF UPR JET. 35-40 KT WLY DEEP SHEAR SHOULD SUPPORT A FEW

SUSTAINED STORMS/SUPERCELLS WITH LARGE HAIL/LOCALLY DMGG WIND

DESPITE SOMEWHAT MODEST MOISTURE NOW PRESENT. INCREASING UPR-LVL

DIVERGENCE WITH THE CONTINUED ENE MOTION OF UPR IMPULSE...AND

ARRIVAL OF SOMEWHAT MORE SUBSTANTIAL BOUNDARY LAYER MOISTURE FROM

KS...SUGGEST THAT THE ACTIVITY COULD EVOLVE INTO AN E OR ESE-MOVING

CLUSTER BY MID-EVE.



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 24020.





...CORFIDI

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