WATCHES: Severe Thunderstorm Watch Number 449

WWUS20 KWNS 272225
SEL9
SPC WW 272225
COZ000-KSZ000-280500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 449
NWS STORM PREDICTION CENTER NORMAN OK
420 PM MDT SAT JUL 27 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN COLORADO
SOUTHWEST KANSAS

* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 420 PM UNTIL
1100 PM MDT.

* 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 90
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF LIMON COLORADO TO 65 MILES SOUTH SOUTHWEST OF GARDEN
CITY KANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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...TSTMS EXPECTED TO CONTINUE FORMING IN SEASONABLY STRONG
ESELY UPSLOPE FLOW OVER THE CO FOOTHILLS...AND POSSIBLY ALONG SFC
BOUNDARY ARCING GENERALLY WNW ACROSS WRN KS INTO E CNTRL CO. AMPLE
LOW-LVL MOISTURE IS PRESENT N OF BOUNDARY TO SUPPORT STRONG
STORMS...ALTHOUGH SFC TEMPS ARE COOL BY LATE JULY STANDARDS.
LARGE-SCALE FORCING FOR ASCENT WILL BE MODEST...BUT WILL INCREASE
LATER THIS EVE WITH THE APPROACH OF UPR IMPULSE NOW CRESTING FLAT
RIDGE OVER WRN PARTS OF CO/WY. AT THE SAME TIME...SOME DEGREE OF
HIGH-LVL STORM VENTING WILL BE PROVIDED...ESPECIALLY IN KS...BY SWRN
FRINGE 100+ KT 250 MB NWLY JET STREAK CENTERED OVER SE NEB. OVERALL
SETUP APPEARS TO BE ONE THAT COULD SUPPORT A FEW SUSTAINED
STORMS/SUPERCELLS CAPABLE OF LARGE HAIL AND LOCALLY DMGG WIND. SOME
OF THE STORMS COULD MERGE INTO CLUSTERS OVER SE CO/SW KS LATER THIS
EVE AS SWLY LLJ STRENGTHENS WITH THE CONTINUED EWD MOTION OF UPR
IMPULSE.

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 30020.


...CORFIDI

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