Alert archive / Minnesota / Tornado Watches in 2004

Tornado Watch 870

October 29, 2004Emmet County, Winnebago County, Worth County, Iowa; 40 counties in Minnesota; 4 counties in Wisconsin

The Storm Prediction Center issued this tornado watch at Oct 29, 2004, 3:35 PM CDT for Emmet County, Winnebago County, Worth County, Iowa; 40 counties in Minnesota; 4 counties in Wisconsin. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Oct 29, 2004, 3:35 PM CDT (20:35 UTC)
Expired
Oct 29, 2004, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 47 counties

Emmet County, IA, Winnebago County, IA, Worth County, IA, Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Pine County, MN, Ramsey County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Todd County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Burnett County, WI, Pierce County, WI, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 44 km from the middle of the area, began a volume at 20:39 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 29, 5:21 PM CDTSevere Thunderstorm WarningMPXCarver, Scott24 min
Oct 29, 5:40 PM CDTSevere Thunderstorm WarningMPXHennepin35 min
Oct 29, 5:44 PM CDTSevere Thunderstorm WarningMPXScott26 min
Oct 29, 5:53 PM CDTTornado WarningMPXBenton, Morrison52 min
Oct 29, 5:57 PM CDTSevere Thunderstorm WarningMPXAnoka33 min
Oct 29, 5:59 PM CDTSevere Thunderstorm WarningMPXIsanti61 min
Oct 29, 6:03 PM CDTTornado WarningMPXIsanti27 min
Oct 29, 6:05 PM CDTTornado WarningMPXPolk25 min
Oct 29, 6:10 PM CDTSevere Thunderstorm WarningMPXSteele20 min
Oct 29, 6:29 PM CDTSevere Thunderstorm WarningARXMower61 min
Oct 29, 6:29 PM CDTSevere Thunderstorm WarningDLHPine61 min
Oct 29, 6:31 PM CDTTornado WarningMPXIsanti29 min
Oct 29, 6:33 PM CDTSevere Thunderstorm WarningMPXGoodhue42 min
Oct 29, 6:38 PM CDTTornado WarningDLHPine52 min
Oct 29, 6:38 PM CDTTornado WarningMPXKanabec22 min
Oct 29, 6:48 PM CDTTornado WarningMPXChisago42 min
Oct 29, 6:50 PM CDTSevere Thunderstorm WarningMPXPierce, Saint Croix40 min
Oct 29, 7:08 PM CDTSevere Thunderstorm WarningARXFillmore67 min
Oct 29, 7:09 PM CDTSevere Thunderstorm WarningMPXPolk51 min
Oct 29, 7:22 PM CDTSevere Thunderstorm WarningMPXChisago23 min
Oct 29, 7:26 PM CDTTornado WarningDLHPine64 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.6 hours before the alert went out and 45 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 2004-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1021 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2004-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 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
1021 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
508 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 29, 2:12 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Buena Vista, Butler and 46 more3 hr
Oct 29, 2:50 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 46 more6 hr
Oct 29, 5:24 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Boone, Bremer, Butler and 33 more96 min
Oct 29, 5:46 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 18 more89 min
Oct 29, 6:30 PM CDTTornado WatchSPCAllamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 19 more6 hr
Oct 29, 10:08 AM CDTMesoscale DiscussionSPCBig Stone, Grant, Lac qui Parle, Pope, Stevens, Swift and 1 more3 hr
Oct 29, 2:57 PM CDTMesoscale DiscussionSPCAitkin, Becker, Carlton, Cass, Clay, Crow Wing and 10 more3 hr
Oct 29, 3:19 PM CDTMesoscale DiscussionSPCAnoka, Benton, Blue Earth, Carver, Chisago, Dakota and 23 more116 min
Oct 29, 6:10 PM CDTMesoscale DiscussionSPCAnoka, Benton, Chisago, Dakota, Dodge, Fillmore and 18 more95 min

Nearby

Tornado Watches in Minnesota, 2004Tornado Watches in Wisconsin, 2004Tornado Watches in Iowa, 2004Every tornado watch in 2004

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; radar from the NEXRAD Level II archive.