Tornado Watch 477

Issued

Jul 3, 2007, 12:10 PM CDT (17:10 UTC)

Expired

Jul 3, 2007, 8:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Minneapolis radar (KMPX), 66 km from the middle of the area, began a volume at 17:10 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.

Two or more tornadoes

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

80%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1365Jul 3, 11:34 AM CDT
• Mesoscale Discussion 1367Jul 3, 2:00 PM CDT
• Mesoscale Discussion 1369Jul 3, 3:36 PM CDT
• Mesoscale Discussion 1370Jul 3, 4:32 PM CDT
• Mesoscale Discussion 1371Jul 3, 5:50 PM CDT
• Mesoscale Discussion 1372Jul 3, 6:55 PM CDT

000
WWUS20 KWNS 031718
SEL7  
SPC WW 031718
MNZ000-WIZ000-040100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 477
NWS STORM PREDICTION CENTER NORMAN OK
1210 PM CDT TUE JUL 3 2007

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

       SOUTHERN AND EASTERN MINNESOTA
       WESTERN WISCONSIN

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1210 PM UNTIL
800 PM 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 APPROXIMATELY ALONG AND 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 115 MILES NORTH NORTHWEST OF
EAU CLAIRE WISCONSIN TO 30 MILES SOUTH SOUTHWEST OF ROCHESTER
MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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.

DISCUSSION...TSTMS ARE FORMING IN CNTRL MN ALONG LEADING EDGE OF
ARCHED OUTFLOW BOUNDARY FROM OVERNIGHT MCS IN SD...WITH ACTIVITY
POSSIBLY BEING ENHANCE BY APPARENT MCV NEAR STC.  STRONG HEATING AND
RICH LOW LEVEL MOISTURE INFLOW AHEAD OF BOUNDARY/MCV WILL YIELD
SUBSTANTIAL DESTABILIZATION OVER MUCH OF WW LATER TODAY.  WHILE
CURRENT WIND FIELD IS RATHER MODEST...SPEED/DIRECTIONAL SHEAR
EXPECTED TO INCREASE WITH TIME.  RESULTING SETUP COULD SUPPORT A FEW
SUPERCELLS WITH A THREAT FOR TORNADOES...IN ADDITION TO MORE
NUMEROUS STORMS WITH HAIL/WIND.

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
500. MEAN STORM MOTION VECTOR 28025.


...CORFIDI

Tornado Watches in Minnesota, 2007Tornado Watches in Wisconsin, 2007Every tornado watch in 2007

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.