WATCHES: Tornado Watch Number 170

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

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