WATCHES: Severe Thunderstorm Watch Number 498

WWUS20 KWNS 231701
SEL8
SPC WW 231701
IAZ000-MNZ000-232300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 498
NWS STORM PREDICTION CENTER NORMAN OK
1200 PM CDT TUE JUN 23 2009

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

NORTHERN INTO CENTRAL IOWA
SOUTHERN MINNESOTA

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM NOON UNTIL 600
PM CDT.

HAIL TO 2 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 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES WEST OF
SPENCER IOWA TO 55 MILES NORTHEAST OF WATERLOO 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 495...WW 496...WW 497...

DISCUSSION...LONG-LIVED COMPLEX OF THUNDERSTORMS MOVING OUT OF THE
CENTRAL PLAINS SHOULD CONTINUE GENERALLY EWD AT 35-40 KT ALONG
COMMON OUTFLOW INTO EXTREME INSTABILITY IN PLACE ACROSS WW.
DAMAGING WINDS COULD BECOME MORE ORGANIZED THIS AFTERNOON AS COLD
POOL INTENSIFIES...WITH LARGE HAIL POSSIBLE WITH THE STRONGER CORES.

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 27035.

...EVANS

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