

213 

WWUS20 KWNS 181953

SEL5

SPC WW 181953

COZ000-NMZ000-190300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 325

NWS STORM PREDICTION CENTER NORMAN OK

155 PM MDT TUE JUN 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN COLORADO

  NORTHEAST NEW MEXICO



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL

  900 PM 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 65

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

NORTHWEST OF AKRON COLORADO TO 55 MILES SOUTHWEST OF CLAYTON NEW

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 324...



DISCUSSION...THUNDERSTORMS ARE FORMING ALONG THE FRONT RANGE IN ERN

CO AND NE NM...AND THESE STORMS SHOULD SPREAD TO THE EAST ACROSS THE

HIGH PLAINS THROUGH THIS EVENING.  INSTABILITY AND VERTICAL WIND

SHEAR WILL BE SUFFICIENT FOR ORGANIZED STORM CLUSTERS...AS WELL AS A

FEW SUPERCELLS...WITH THE RISK FOR LARGE HAIL AND DAMAGING WINDS.  A

TORNADO OR TWO CANNOT BE RULED OUT WITH STORMS DEVELOPING ALONG A

WEAK DENVER CONVERGENCE ZONE...AND WHERE MOISTURE AND VERTICAL SHEAR

ARE A LITTLE LARGER IN THE ARKANSAS RIVER VALLEY IN SE CO.



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 29015.





...THOMPSON

