Alert archive / Iowa / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 169

May 8, 20044 states

The Storm Prediction Center issued this severe thunderstorm watch at May 8, 2004, 8:25 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 8, 2004, 8:25 PM CDT (01:25 UTC)
Expired: May 9, 2004, 2:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 121 counties

Adair County, IA, Adams County, IA, Allamakee County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Chickasaw County, IA, Clarke County, IA, Clayton County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Delaware County, IA, Fayette County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Muscatine County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Webster County, IA, Winneshiek County, IA, Brown County, KS, Clay County, KS, Cloud County, KS, Ellis County, KS, Jewell County, KS, Lincoln County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Russell County, KS, Smith County, KS, Washington County, KS, Atchison County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Adams County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Omaha radar (KOAX), 37 km from the middle of the area, began a volume at 01:28 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

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

Issued	Product	Office	Counties	Lasted
May 8, 8:29 PM CDT	Severe Thunderstorm Warning	ARX	Howard, Winneshiek	61 min
May 8, 8:31 PM CDT	Severe Thunderstorm Warning	OAX	Butler	19 min
May 8, 8:32 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	43 min
May 8, 8:41 PM CDT	Severe Thunderstorm Warning	GID	Furnas, Harlan	49 min
May 8, 8:43 PM CDT	Severe Thunderstorm Warning	DMX	Madison	47 min
May 8, 8:46 PM CDT	Severe Thunderstorm Warning	DMX	Adair	44 min
May 8, 8:52 PM CDT	Flash Flood Warning	ARX	Allamakee	3 hr
May 8, 8:56 PM CDT	Flash Flood Warning	DMX	Audubon, Emmet, Palo Alto	129 days
May 8, 9:01 PM CDT	Flash Flood Warning	DMX	Adair, Madison, Winnebago	129 days
May 8, 9:06 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	24 min
May 8, 9:13 PM CDT	Severe Thunderstorm Warning	DMX	Cass	47 min
May 8, 9:29 PM CDT	Severe Thunderstorm Warning	DMX	Madison	31 min
May 8, 9:41 PM CDT	Severe Thunderstorm Warning	DMX	Adair	49 min
May 8, 10:01 PM CDT	Severe Thunderstorm Warning	DMX	Madison	44 min
May 8, 10:12 PM CDT	Severe Thunderstorm Warning	OAX	Butler, Saunders	48 min
May 8, 10:29 PM CDT	Severe Thunderstorm Warning	DMX	Union	46 min
May 8, 11:21 PM CDT	Severe Thunderstorm Warning	OAX	Mills	39 min
May 8, 11:38 PM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona	37 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, 1.4 hours before the alert went out and 38 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2163 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 2150 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 8, 7:54 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Carroll, Cass, Clarke and 19 more	2 hr
May 8, 10:44 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Clarke, Decatur, Fremont and 12 more	2 hr
May 9, 1:22 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Cass, Cedar, Clarke and 30 more	23 min
May 9, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	Lyon, Sioux	6 hr
May 9, 4:46 PM CDT	Mesoscale Discussion	SPC	Allamakee, Buchanan, Clayton, Clinton, Delaware, Dubuque and 4 more	59 min
May 9, 5:38 PM CDT	Mesoscale Discussion	SPC	Dickinson, Emmet, Lyon, Osceola, Sioux	2 hr
May 9, 2:42 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Greeley, Logan, Rawlins, Sherman and 3 more	3 hr
May 9, 3:07 PM CDT	Mesoscale Discussion	SPC	Morton, Stevens	2 hr
May 9, 3:30 PM CDT	Severe Thunderstorm Watch	SPC	Decatur, Gove, Graham, Logan, Norton, Phillips and 7 more	6 hr
May 8, 9:17 PM CDT	Mesoscale Discussion	SPC	Boyd	88 min
May 9, 6:12 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Buffalo, Butler and 37 more	2 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2004 Severe Thunderstorm Watches in Nebraska, 2004 Severe Thunderstorm Watches in Kansas, 2004 Every 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.