Alert archive / Iowa / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 696

August 3, 200431 counties in Iowa; 5 counties in Minnesota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 3, 2004, 11:05 AM CDT for 31 counties in Iowa; 5 counties in Minnesota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Aug 3, 2004, 11:05 AM CDT (16:05 UTC)
Expired: Aug 3, 2004, 5:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 36 counties

Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Lyon County, IA, Marshall 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, Wright County, IA, Jackson County, MN, Martin County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN

The radar

The Sioux Falls radar (KFSD), 164 km from the middle of the area, began a volume at 16:07 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

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

Issued	Product	Office	Counties	Lasted
Aug 3, 11:28 AM CDT	Flash Flood Warning	FSD	Rock	92 min
Aug 3, 11:42 AM CDT	Severe Thunderstorm Warning	FSD	Rock	63 min
Aug 3, 12:12 PM CDT	Severe Thunderstorm Warning	FSD	Nobles	48 min
Aug 3, 12:25 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Osceola	50 min
Aug 3, 12:46 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	44 min
Aug 3, 12:57 PM CDT	Severe Thunderstorm Warning	FSD	Nobles	18 min
Aug 3, 1:11 PM CDT	Severe Thunderstorm Warning	MPX	Martin	64 min
Aug 3, 1:12 PM CDT	Severe Thunderstorm Warning	DMX	Emmet	63 min
Aug 3, 1:25 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	20 min
Aug 3, 1:45 PM CDT	Severe Thunderstorm Warning	FSD	Jackson	30 min
Aug 3, 1:53 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	52 min
Aug 3, 2:11 PM CDT	Severe Thunderstorm Warning	MPX	Martin	64 min
Aug 3, 2:34 PM CDT	Severe Thunderstorm Warning	DMX	Winnebago	56 min
Aug 3, 2:44 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	31 min
Aug 3, 3:05 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac	55 min
Aug 3, 3:34 PM CDT	Severe Thunderstorm Warning	DMX	Webster	56 min
Aug 3, 3:56 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun	34 min
Aug 3, 4:17 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton	43 min
Aug 3, 4:19 PM CDT	Severe Thunderstorm Warning	DMX	Franklin	41 min
Aug 3, 4:27 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	48 min
Aug 3, 4:38 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Grundy	52 min
Aug 3, 4:42 PM CDT	Severe Thunderstorm Warning	DMX	Story	33 min
Aug 3, 4:52 PM CDT	Severe Thunderstorm Warning	DMX	Marshall	53 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, 4.1 hours before the alert went out and 211 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: 485 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 957 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 3, 2:02 AM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Boone, Buena Vista, Butler, Calhoun and 30 more	118 min
Aug 3, 7:21 AM CDT	Mesoscale Discussion	SPC	Lyon	54 min
Aug 3, 10:48 AM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Buena Vista, Butler and 32 more	87 min
Aug 3, 1:16 PM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 46 more	89 min
Aug 3, 2:25 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more	5 hr
Aug 3, 3:00 PM CDT	Mesoscale Discussion	SPC	Adair, Audubon, Carroll, Cass, Crawford, Greene and 8 more	2 hr
Aug 3, 3:55 PM CDT	Mesoscale Discussion	SPC	Adair, Appanoose, Benton, Black Hawk, Boone, Buchanan and 43 more	95 min
Aug 3, 4:25 PM CDT	Tornado Watch	SPC	Appanoose, Benton, Black Hawk, Boone, Buchanan, Cedar and 39 more	6 hr
Aug 3, 4:52 PM CDT	Mesoscale Discussion	SPC	Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more	53 min
Aug 3, 5:00 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more	5 hr
Aug 3, 5:07 PM CDT	Mesoscale Discussion	SPC	Allamakee, Clayton, Fayette, Winneshiek	53 min
Aug 3, 5:39 PM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 32 more	66 min
Aug 3, 6:34 PM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 28 more	86 min
Aug 3, 6:45 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more	90 min

Nearby

Severe Thunderstorm Watches in Iowa, 2004 Severe Thunderstorm Watches in Minnesota, 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.