WATCHES: Tornado Watch Number 479

WWUS20 KWNS 032100
SEL9
SPC WW 032100
IAZ000-MNZ000-NEZ000-SDZ000-040500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 479
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT TUE JUL 3 2007

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

NORTHWEST AND NORTH CENTRAL IOWA
SOUTHWEST MINNESOTA
NORTHEAST NEBRASKA
SOUTHEAST SOUTH DAKOTA

EFFECTIVE THIS TUESDAY AFTERNOON FROM 400 PM UNTIL MIDNIGHT CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF NORFOLK
NEBRASKA TO 20 MILES NORTHEAST OF MASON CITY IOWA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 477...WW 478...

DISCUSSION...TSTMS/POSSIBLE SUPERCELLS EXPECTED TO DEVELOP IN THE
NEXT 1-2 HRS AS HEATING CONTINUES INVOF SE-MOVING FRONT. RICH
MOISTURE INFLOW AND STEEP MID LEVEL LAPSE RATES ARE CONTRIBUTING TO
SUBSTANTIAL CAPE AND POTENTIALLY LOW CLOUD BASES. THIS MAY SUPPORT
A THREAT FOR A COUPLE TORNADOES...DESPITE MODEST LOW LVL
SHEAR...BEFORE ACTIVITY EVOLVES INTO A CLUSTER WITH A CONTINUING
THREAT FOR LARGE HAIL/WIND.

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
550. MEAN STORM MOTION VECTOR 29025.

..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 chris@lib.siu.edu.