Alert archive / Iowa / Mesoscale Discussions in 2004

Mesoscale Discussion 2366

October 29, 200452 counties in Iowa; Faribault County, Jackson County, Martin County, Minnesota; 5 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Oct 29, 2004, 2:12 PM CDT for 52 counties in Iowa; Faribault County, Jackson County, Martin County, Minnesota; 5 counties in Missouri. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Oct 29, 2004, 2:12 PM CDT (19:12 UTC)
Expired
Oct 29, 2004, 4:45 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 60 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Clarke County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Jasper County, IA, Kossuth County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Faribault County, MN, Jackson County, MN, Martin County, MN, Gentry County, MO, Harrison County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 44 km from the middle of the area, began a volume at 19:11 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.

The watches that followed

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

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.2 hours before the alert went out and 193 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, Omaha, NE at 12:00Z on 2004-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1500 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, Omaha, NE at 12:00Z on 2004-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 227 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
1500 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
695 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
227 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
1.2
Supercell composite
7.8

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, 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, 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
Oct 29, 12:39 PM CDTMesoscale DiscussionSPCAndrew, Buchanan, Caldwell, Cass, Clay, Clinton and 6 more3 hr
Oct 29, 5:10 PM CDTTornado WatchSPCAdair, Barton, Bates, Benton, Boone, Caldwell and 41 more5 hr
Oct 29, 6:00 PM CDTTornado WatchSPCBarry, Christian, McDonald, Newton, Stone5 hr

Nearby

Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Missouri, 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; radar from the NEXRAD Level II archive.