Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 2370

October 29, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Oct 29, 2004, 5:46 PM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Oct 29, 2004, 5:46 PM CDT (22:46 UTC)
Expired
Oct 29, 2004, 7:15 PM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 62 counties

Allamakee County, IA, Benton County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Winneshiek County, IA, Jo Daviess County, IL, Houston County, MN, Winona County, MN, Adams County, WI, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dunn County, WI, Eau Claire County, WI, Grant County, WI, Iowa County, WI, Iron County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Monroe County, WI, Oneida County, WI, Pepin County, WI, Portage County, WI, Price County, WI, Richland County, WI, Rusk County, WI, Sauk County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Vilas County, WI, Washburn County, WI, Wood County, WI

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.8 hours before the alert went out and 209 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

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 29, 6:16 PM CDTMesoscale DiscussionSPCBond, Brown, Cass, Champaign, Christian, Coles and 33 more119 min
Oct 29, 6:30 PM CDTTornado WatchSPCBureau, Carroll, Fulton, Hancock, Henderson, Henry and 11 more6 hr
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, 3:35 PM CDTTornado WatchSPCEmmet, Winnebago, Worth5 hr
Oct 29, 5:24 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Boone, Bremer, Butler and 33 more96 min
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

Mesoscale Discussions in Wisconsin, 2004Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Minnesota, 2004Every mesoscale discussion 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.