Tornado Watch 698

Issued

Aug 3, 2004, 4:25 PM CDT (21:25 UTC)

Expired

Aug 3, 2004, 10:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Des Moines radar (KDMX), 122 km from the middle of the area, began a volume at 21:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

• Mesoscale Discussion 1855Aug 3, 1:16 PM CDT
• Mesoscale Discussion 1858Aug 3, 3:55 PM CDT
• Mesoscale Discussion 1862Aug 3, 5:39 PM CDT
• Mesoscale Discussion 1864Aug 3, 6:34 PM CDT
• Mesoscale Discussion 1868Aug 3, 7:38 PM CDT
• Mesoscale Discussion 1869Aug 3, 8:19 PM CDT

000 
WWUS20 KWNS 032125
SEL8  
SPC WW 032125
IAZ000-ILZ000-040300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 698
NWS STORM PREDICTION CENTER NORMAN OK
425 PM CDT TUE AUG 3 2004

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

       CENTRAL AND EASTERN IOWA
       NORTHWEST ILLINOIS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 425 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 90 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 25 MILES WEST NORTHWEST OF DES MOINES IOWA TO
55 MILES EAST NORTHEAST OF MOLINE ILLINOIS.

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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 696. WATCH NUMBER 696 WILL NOT BE IN EFFECT AFTER 425
PM CDT. CONTINUE...WW 697...

DISCUSSION...WITH EXTREME INSTABILITY AVAILABLE AHEAD OF SEVERE
STORMS NOW ACROSS CENTRAL IA...COUPLED WITH A FAVORABLE VEERING
SHEAR PROFILE...TORNADIC SUPERCELLS ARE LIKELY.  PRIMARY THREAT WILL
BE VERY DAMAGING WINDS GIVEN MLCAPES TO 4500  BUT TORNADOES ALSO
POSSIBLE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 80 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 27030.


...HALES

424,0940 424,0893 404,0893 403,0940

Tornado Watches in Iowa, 2004Tornado Watches in Illinois, 2004Every tornado watch in 2004

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.