WWUS20 KWNS 161851
SEL3
SPC WW 161851
KSZ000-NEZ000-170100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 163
NWS STORM PREDICTION CENTER NORMAN OK
155 PM CDT THU MAY 16 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  NORTHWEST KANSAS
  SOUTHWEST AND SOUTH CENTRAL NEBRASKA

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 155 PM UNTIL
  800 PM CDT.

* 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

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF
NORTH PLATTE NEBRASKA TO 40 MILES WEST SOUTHWEST OF HILL CITY
KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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.

&&

DISCUSSION...STORMS HAVE FORMED IN AN ARC IN ADVANCE OF A
SMALL-SCALE VORTICITY MAX MOVING ENEWD ACROSS NERN CO.  STEEP LAPSE
RATES...SUFFICIENT MOISTURE...AND ENHANCED SWLY FLOW ALOFT IN THE
WAKE OF AN MCV OVER NORTH CENTRAL NEB ARE PROVIDING A FAVORABLE
ENVIRONMENT FOR SEVERE STORMS TO CONTINUE INTO THE AFTERNOON.

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 25025.


...WEISS