Tornado Watch 748

Issued

Jul 14, 2003, 7:40 PM CDT (00:40 UTC)

Expired

Jul 15, 2003, 12:00 AM CDT

In force

4 hr

Issued by

the Storm Prediction Center

The Minneapolis radar (KMPX), 108 km from the middle of the area, began a volume at 00:43 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 1839Jul 14, 5:05 PM CDT
• Mesoscale Discussion 1845Jul 14, 7:16 PM CDT
• Mesoscale Discussion 1846Jul 14, 7:42 PM CDT
• Mesoscale Discussion 1849Jul 14, 11:05 PM CDT

000 
WWUS20 KWNS 150045
SEL8  
SPC WW 150040
IAZ000-MNZ000-WIZ000-150500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 748 
NWS STORM PREDICTION CENTER NORMAN OK 
740 PM CDT MON JUL 14 2003

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

       NORTH CENTRAL AND NORTHEAST IOWA
       SOUTHEAST MINNESOTA
       WESTERN WISCONSIN

EFFECTIVE THIS MONDAY NIGHT FROM 740 PM UNTIL MIDNIGHT CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 100 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 30 MILES WEST NORTHWEST OF MASON CITY IOWA TO
35 MILES SOUTHEAST OF EAU CLAIRE WISCONSIN.

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 744...WW 745...WW 746...WW
747...


DISCUSSION...BAND OF SEVERE STORMS FROM EXTREME EAST CENTRAL MN SWWD
INTO SOUTH CENTRAL MN HAS SLOWLY BEEN DEVELOPING SWD DURING THE LAST
SEVERAL HOURS. STORMS ARE EXPECTED TO CONTINUE TO DEVELOP AND
INTENSIFY ALONG/EAST OF SURFACE TROUGH EXTENDING INTO WRN IA IN
RESPONSE TO INCREASING DYNAMIC FORCING ALOFT ASSOCIATED WITH NWLY
JET STREAK MOVING INTO THE UPPER MS VALLEY.  AIR MASS EAST OF THE
TROUGH LINE REMAINS VERY UNSTABLE WITH MLCAPE OF 3000-4000 J/KG INTO
IA...HOWEVER 00Z OAX SOUNDING SHOWS A WEAK CAP EXISTS BELOW 700 MB. 
THE CAP IS EXPECTED TO GRADUALLY WEAKEN EWD INTO CENTRAL PARTS OF IA
WHICH SHOULD ALLOW STORMS TO DEVELOP SWD OVER THE NEXT FEW HOURS. 
WINDS VEER/INCREASE WITH HEIGHT OVER THE REGION WHICH SUPPORT
OCCASIONAL SUPERCELLS.

AVIATION...TORNADOES AND 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 550.
MEAN STORM MOTION VECTOR 28035.


...WEISS

444,0935 455,0905 430,0905 415,0935

Tornado Watches in Iowa, 2003Tornado Watches in Minnesota, 2003Tornado Watches in Wisconsin, 2003Every tornado watch in 2003

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.