Alert archive / Wisconsin / Tornado Watches in 2000

Tornado Watch 730

September 11, 20004 counties in Iowa; 6 counties in Minnesota; 12 counties in Wisconsin

The Storm Prediction Center issued this tornado watch at Sep 11, 2000, 3:30 PM CDT for 4 counties in Iowa; 6 counties in Minnesota; 12 counties in Wisconsin. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Sep 11, 2000, 3:30 PM CDT (20:30 UTC)
Expired
Sep 11, 2000, 8:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 22 counties

Allamakee County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Pepin County, WI, Rusk County, WI, Taylor County, WI, Trempealeau County, WI

Warnings issued inside it

13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Sep 11, 3:41 PM CDTTornado WarningMPXChippewa, Eau Claire49 min
Sep 11, 3:56 PM CDTTornado WarningMPXDunn19 min
Sep 11, 4:03 PM CDTSevere Thunderstorm WarningMPXRusk42 min
Sep 11, 4:16 PM CDTTornado WarningMPXDunn14 min
Sep 11, 4:26 PM CDTTornado WarningMPXChippewa, Eau Claire49 min
Sep 11, 4:27 PM CDTSevere Thunderstorm WarningARXTaylor63 min
Sep 11, 4:57 PM CDTSevere Thunderstorm WarningARXAllamakee63 min
Sep 11, 4:57 PM CDTSevere Thunderstorm WarningARXClark63 min
Sep 11, 5:01 PM CDTSevere Thunderstorm WarningARXWinona59 min
Sep 11, 5:46 PM CDTSevere Thunderstorm WarningARXJackson74 min
Sep 11, 5:56 PM CDTSevere Thunderstorm WarningARXClark64 min
Sep 11, 6:17 PM CDTSevere Thunderstorm WarningARXTrempealeau28 min
Sep 11, 6:32 PM CDTSevere Thunderstorm WarningARXLa Crosse, Monroe58 min

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.5 hours before the alert went out and 161 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2000-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 277 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2000-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
277 J/kg
Mixed-layer CIN
-297 J/kg
Mixed-layer LCL
1331 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

080 
WWUS9 KMKC 112013
SEL0  

SEL0  
MKC WW 112006
IAZ000-MNZ000-WIZ000-120100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 730
STORM PREDICTION CENTER NORMAN OK
306 PM CDT MON SEP 11 2000

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

   EXTREME NORTHEAST IOWA                               
   SOUTHEAST MINNESOTA                          
   WESTERN WISCONSIN                          

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 330 PM UNTIL 800
PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES EAST AND WEST
OF A LINE FROM 60 MILES SOUTH SOUTHEAST OF ROCHESTER MINNESOTA TO
55 MILES NORTH NORTHEAST 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 728...WW 729...

DISCUSSION...STORMS CONTINUE TO INTENSIFY RAPIDLY JUST AHEAD OF
SURFACE LOW IN VERY UNSTABLE AIR OVER WRN WI.  SFC BASED CAPES ARE
3000 TO 4500 J/KG IN THE WARM SECTOR JUSTAHEAD APPROACHING COLD
FRONT.  FAVORABLE 0-6 KM SHEAR OF 50-70 KT IS ALSO PRESENT TO
PROMOTE SUPERCELLS.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 25035.


...MCCARTHY

453,0900 430,0910 430,0930 453,0920

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 10, 8:15 PM CDTSevere Thunderstorm WatchSPCAllamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 9 more6 hr
Sep 11, 1:15 PM CDTTornado WatchSPCBenton, Black Hawk, Bremer, Buchanan, Butler, Cedar and 21 more6 hr
Sep 11, 4:45 PM CDTSevere Thunderstorm WatchSPCAppanoose, Clarke, Davis, Decatur, Henry, Jefferson and 8 more5 hr
Sep 11, 1:30 PM CDTSevere Thunderstorm WatchSPCGreen, Kenosha, Rock, Walworth6 hr
Sep 11, 5:15 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Calumet, Columbia, Crawford, Dodge and 26 more6 hr

Nearby

Tornado Watches in Wisconsin, 2000Tornado Watches in Minnesota, 2000Tornado Watches in Iowa, 2000Every tornado watch in 2000

Sources

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.