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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 228

NWS STORM PREDICTION CENTER NORMAN OK

120 PM MDT MON MAY 27 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHEAST COLORADO

  NORTHWEST KANSAS

  WESTERN NEBRASKA INCLUDING THE PANHANDLE



* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 120 PM UNTIL

  900 PM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL VERY LARGE HAIL EVENTS TO 2.5 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 15 MILES NORTH

NORTHEAST OF CHADRON NEBRASKA TO 45 MILES SOUTH SOUTHEAST OF

BURLINGTON COLORADO.  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 227...



DISCUSSION...TSTMS WILL CONTINUE TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON AS REGION IS GLANCED BY A MIDLEVEL IMPULSE

MOVING OUT OF THE ROCKIES.  STEEP LAPSE RATES AND A RELATIVELY MOIST

BOUNDARY LAYER ARE YIELDING A MODERATELY UNSTABLE AIR MASS THIS

AFTERNOON AMIDST A KINEMATIC ENVIRONMENT FEATURING VERTICALLY

VEERING WIND PROFILES WITH SUFFICIENT SHEAR FOR SUPERCELLS.  WHILE

LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY HAZARDS...A

TORNADO IS POSSIBLE.  THIS IS ESPECIALLY THE CASE ACROSS NWRN KS

WHERE PORTIONS OF THE WATCH MAY NEED TO BE UPGRADED TO A TORNADO

WATCH LATER THIS AFTERNOON.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 26020.





...MEAD

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