WATCHES: Severe Thunderstorm Watch Number 688

WWUS20 KWNS 250038
SEL8
SPC WW 250038
IAZ000-NEZ000-250800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 688
NWS STORM PREDICTION CENTER NORMAN OK
735 PM CDT MON SEP 24 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHWEST IOWA
SOUTHEAST NEBRASKA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 735 PM UNTIL
300 AM CDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 35
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST
NORTHWEST OF BEATRICE NEBRASKA TO 35 MILES NORTH NORTHEAST OF
SHENANDOAH IOWA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 687...

DISCUSSION...SMALL AREA OF STRONG STORMS/POTENTIAL SUPERCELLS
EXPECTED TO PERSIST W OF BIE...NEAR INTERSECTION OF SE-MOVING COLD
FRONT AND N/S CONFLUENCE AXIS ACROSS KS. AS SSWLY LLJ SLIGHTLY
STRENGTHENS THIS EVENING...ACTIVITY MAY CONTINUE TO FORM AND SPREAD
ENE ALONG THE FRONT TOWARD THE LNK/OMA AREA. GIVEN DEGREE OF
LINGERING INSTABILITY AND MODERATE WIND FIELD...POTENTIAL WILL EXIST
FOR LOCALLY DAMAGING WIND AND HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25030.

..CORFIDI

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@PO.UIUC.EDU with
"unsub wx-storm" in the body of your message. For more information write cnovy@cox.net.