Alert archive / Iowa / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 160

May 7, 20044 states

The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2004, 10:20 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2004, 10:20 PM CDT (03:20 UTC)
Expired
May 8, 2004, 4:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 92 counties

Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Marshall County, IA, Mitchell County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Brown County, MN, Cottonwood County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nobles County, MN, Olmsted County, MN, Pipestone County, MN, Rice County, MN, Rock County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Antelope County, NE, Boone County, NE, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Bon Homme County, SD, Clay County, SD, Davison County, SD, Hanson County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 86 km from the middle of the area, began a volume at 03:23 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

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

IssuedProductOfficeCountiesLasted
May 7, 11:20 PM CDTSevere Thunderstorm WarningFSDCottonwood, Jackson25 min
May 7, 11:41 PM CDTSevere Thunderstorm WarningFSDJackson, Nobles34 min
May 7, 11:55 PM CDTSevere Thunderstorm WarningARXDodge, Mower50 min
May 8, 12:16 AM CDTSevere Thunderstorm WarningFSDJackson29 min
May 8, 12:16 AM CDTSevere Thunderstorm WarningMPXMartin, Watonwan44 min
May 8, 12:24 AM CDTSevere Thunderstorm WarningFSDSioux36 min
May 8, 12:36 AM CDTSevere Thunderstorm WarningMPXBlue Earth, Waseca39 min
May 8, 12:55 AM CDTSevere Thunderstorm WarningARXFillmore, Olmsted35 min
May 8, 12:56 AM CDTSevere Thunderstorm WarningFSDO'Brien34 min
May 8, 12:59 AM CDTSevere Thunderstorm WarningFSDSioux16 min
May 8, 1:03 AM CDTSevere Thunderstorm WarningMPXFaribault42 min
May 8, 1:05 AM CDTSevere Thunderstorm WarningFSDOsceola25 min
May 8, 1:11 AM CDTSevere Thunderstorm WarningARXDodge64 min
May 8, 1:21 AM CDTSevere Thunderstorm WarningMPXGoodhue, Steele39 min
May 8, 1:30 AM CDTSevere Thunderstorm WarningFSDClay, O'Brien30 min
May 8, 1:30 AM CDTSevere Thunderstorm WarningARXFillmore, Olmsted30 min
May 8, 1:38 AM CDTSevere Thunderstorm WarningMPXMartin37 min
May 8, 1:38 AM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn52 min
May 8, 2:00 AM CDTSevere Thunderstorm WarningFSDClay30 min
May 8, 2:07 AM CDTSevere Thunderstorm WarningDMXPalo Alto38 min
May 8, 2:25 AM CDTSevere Thunderstorm WarningDMXKossuth35 min
May 8, 2:40 AM CDTSevere Thunderstorm WarningDMXWinnebago50 min
May 8, 3:03 AM CDTSevere Thunderstorm WarningDMXHancock42 min
May 8, 3:15 AM CDTSevere Thunderstorm WarningDMXCerro Gordo, Worth45 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

Omaha, NE (KOAX), launched 00:00Z, 3.3 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, Omaha, NE at 00:00Z on 2004-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 989 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 00:00Z on 2004-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 299 square meters per square second.193958Sfc1 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
989 J/kg
Mixed-layer CIN
-384 J/kg
Mixed-layer LCL
1306 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
299 m²/s²
0-3 km storm-relative helicity
532 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 7, 8:20 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Buchanan, Clayton, Delaware, Dubuque and 5 more85 min
May 7, 9:53 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Cerro Gordo, Cherokee, Clay, Crawford and 21 more97 min
May 8, 12:26 AM CDTMesoscale DiscussionSPCAllamakee, Clayton, Winneshiek64 min
May 8, 12:50 AM CDTSevere Thunderstorm WatchSPCAllamakee, Winneshiek6 hr
May 8, 2:27 AM CDTMesoscale DiscussionSPCBlack Hawk, Boone, Bremer, Buena Vista, Butler, Calhoun and 27 more93 min
May 8, 3:36 AM CDTMesoscale DiscussionSPCAllamakee, Winneshiek54 min
May 8, 5:35 AM CDTMesoscale DiscussionSPCAllamakee, Winneshiek55 min
May 8, 2:27 PM CDTMesoscale DiscussionSPCAdair, Audubon, Black Hawk, Boone, Bremer, Buena Vista and 37 more3 hr
May 8, 3:45 PM CDTSevere Thunderstorm WatchSPCAudubon, Benton, Black Hawk, Boone, Bremer, Buchanan and 38 more5 hr
May 8, 5:45 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Benton, Boone, Buena Vista and 33 more2 hr
May 8, 4:50 PM CDTSevere Thunderstorm WatchSPCAdams, Buffalo, Butler, Clay, Dawson, Franklin and 14 more4 hr
May 8, 6:56 PM CDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Hall, Hamilton, Howard and 5 more2 hr
May 7, 7:34 PM CDTMesoscale DiscussionSPCButte, Lawrence, Meade86 min
May 8, 12:44 PM CDTMesoscale DiscussionSPCButte, Harding, Lawrence, Meade, Pennington, Perkins3 hr
May 8, 2:35 PM CDTSevere Thunderstorm WatchSPCButte, Dewey, Harding, Meade, Perkins, Stanley and 1 more5 hr
May 8, 5:11 PM CDTMesoscale DiscussionSPCButte, Dewey, Harding, Meade, Perkins, Stanley and 1 more64 min

Nearby

Severe Thunderstorm Watches in Iowa, 2004Severe Thunderstorm Watches in Minnesota, 2004Severe Thunderstorm Watches in Nebraska, 2004Every severe thunderstorm 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.