SPC Severe Thunderstorm Watch 228

WW 228 SEVERE TSTM CO KS NE 271920Z – 280300Z

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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