

372 

WWUS20 KWNS 181952

SEL0

SPC WW 181952

COZ000-KSZ000-NEZ000-190400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 170

NWS STORM PREDICTION CENTER NORMAN OK

245 PM CDT SAT MAY 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  NORTHEAST AND EAST CENTRAL COLORADO

  WESTERN AND CENTRAL KANSAS

  WESTERN NEBRASKA



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 245 PM UNTIL

  1100 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES LIKELY

  NUMEROUS LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL

    EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE

MILES EAST AND WEST OF A LINE FROM 5 MILES NORTH NORTHEAST OF

CHADRON NEBRASKA TO 30 MILES SOUTHEAST OF MEDICINE LODGE KANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



DISCUSSION...INITIATION OF SEVERE STORMS IS EXPECTED DURING THE NEXT

FEW HOURS...BOTH WITHIN MOIST UPSLOPE FLOW NEAR THE LEE SURFACE

TROUGH ACROSS PARTS OF WESTERN NEBRASKA INTO NORTHEAST/EAST CENTRAL

COLORADO...AND ALONG THE DRYLINE ACROSS PARTS OF WESTERN KANSAS.  AS

ACTIVITY SPREADS NORTHWARD/NORTHEASTWARD WITHIN A VERY UNSTABLE

ENVIRONMENT...VERY LARGE HAIL AND A FEW TORNADOES APPEAR POSSIBLE

WITH STRONGEST STORMS INTO EARLY EVENING.  TORNADIC POTENTIAL MAY BE

A BIT SLOWER TO DEVELOP AHEAD OF THE DRYLINE ACROSS KANSAS...THAN IN

THE COOLER UPSLOPE REGIME TO THE NORTHWEST...BUT LOW-LEVEL JET

STRENGTHENING AND INCREASING BOUNDARY LAYER RELATIVE HUMIDITY WILL

SUPPORT A WINDOW OF OPPORTUNITY FOR ONE OR TWO STRONG TORNADOES

ACROSS PARTS OF WESTERN INTO CENTRAL KANSAS NEAR/SHORTLY AFTER

SUNSET.



AVIATION...TORNADOES AND 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 25025.





...KERR

