Alert archive / Iowa / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 781

August 25, 20044 states

The Storm Prediction Center issued this severe thunderstorm watch at Aug 25, 2004, 8:50 AM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Aug 25, 2004, 8:50 AM CDT (13:50 UTC)
Expired: Aug 25, 2004, 2:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 46 counties

Adams County, IA, Clarke County, IA, Decatur County, IA, Fremont County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Brown County, KS, Clay County, KS, Cloud County, KS, Doniphan County, KS, Marshall County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Thayer County, NE

The radar

The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 13:52 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

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

Issued	Product	Office	Counties	Lasted
Aug 25, 9:03 AM CDT	Severe Thunderstorm Warning	OAX	Gage	42 min
Aug 25, 9:19 AM CDT	Severe Thunderstorm Warning	TOP	Marshall	56 min
Aug 25, 9:29 AM CDT	Severe Thunderstorm Warning	OAX	Jefferson	31 min
Aug 25, 9:46 AM CDT	Severe Thunderstorm Warning	TOP	Washington	29 min
Aug 25, 10:59 AM CDT	Severe Thunderstorm Warning	OAX	Richardson	31 min
Aug 25, 11:00 AM CDT	Severe Thunderstorm Warning	OAX	Richardson	30 min
Aug 25, 11:01 AM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt	59 min
Aug 25, 11:32 AM CDT	Severe Thunderstorm Warning	OAX	Page	28 min
Aug 25, 11:33 AM CDT	Severe Thunderstorm Warning	DMX	Taylor	42 min
Aug 25, 11:39 AM CDT	Severe Thunderstorm Warning	EAX	Nodaway	66 min
Aug 25, 11:51 AM CDT	Severe Thunderstorm Warning	DMX	Ringgold	54 min
Aug 25, 12:02 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Union	58 min
Aug 25, 12:17 PM CDT	Severe Thunderstorm Warning	EAX	Gentry	58 min
Aug 25, 12:34 PM CDT	Flash Flood Warning	EAX	Nodaway	8 hr
Aug 25, 12:35 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur	55 min
Aug 25, 12:41 PM CDT	Severe Thunderstorm Warning	EAX	Harrison, Worth	49 min
Aug 25, 1:15 PM CDT	Severe Thunderstorm Warning	EAX	Mercer	45 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 12:00Z, 1.8 hours before the alert went out and 109 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: 1754 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: -58 m²/s²
Significant tornado parameter: -0.4
Supercell composite: -3.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 25, 9:24 AM CDT	Mesoscale Discussion	SPC	Appanoose, Davis, Des Moines, Henry, Jefferson, Lee and 2 more	2 hr
Aug 25, 12:35 PM CDT	Tornado Watch	SPC	Appanoose, Davis, Decatur, Des Moines, Henry, Jefferson and 7 more	6 hr
Aug 25, 1:22 PM CDT	Mesoscale Discussion	SPC	Clinton, Jackson, Scott	113 min
Aug 25, 1:31 PM CDT	Mesoscale Discussion	SPC	Lyon, O'Brien, Osceola, Sioux	119 min
Aug 24, 8:20 PM CDT	Severe Thunderstorm Watch	SPC	Atchison, Brown, Clay, Dickinson, Doniphan, Douglas and 14 more	7 hr
Aug 24, 11:47 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Clay, Doniphan, Douglas, Geary and 12 more	118 min
Aug 25, 11:59 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Douglas, Jackson, Jefferson and 4 more	91 min
Aug 25, 4:50 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Chase, Coffey and 21 more	85 min
Aug 25, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Coffey, Douglas, Franklin, Jackson, Jefferson and 10 more	5 hr
Aug 25, 2:14 AM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Buchanan, Caldwell, Chariton, Clinton and 14 more	31 min
Aug 25, 2:20 PM CDT	Tornado Watch	SPC	Saint Charles, Saint Louis, City of Saint Louis	6 hr
Aug 25, 3:15 PM CDT	Severe Thunderstorm Watch	SPC	Camden, Carter, Christian, Cole, Crawford, Dallas and 25 more	6 hr
Aug 25, 5:14 PM CDT	Mesoscale Discussion	SPC	Saint Charles, Saint Louis, City of Saint Louis	91 min
Aug 24, 10:41 PM CDT	Mesoscale Discussion	SPC	Boone, Buffalo, Custer, Dawson, Frontier, Garfield and 11 more	2 hr
Aug 25, 1:44 AM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Butler, Clay and 23 more	91 min

Nearby

Severe Thunderstorm Watches in Iowa, 2004 Severe Thunderstorm Watches in Missouri, 2004 Severe Thunderstorm Watches in Nebraska, 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.