Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 1852

July 24, 200525 counties in Iowa; 19 counties in Nebraska; Clay County, Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2005, 8:26 PM CDT for 25 counties in Iowa; 19 counties in Nebraska; Clay County, Union County, South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 24, 2005, 8:26 PM CDT (01:26 UTC)
Expired: Jul 24, 2005, 10:00 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 46 counties

Boone County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Cherokee County, IA, Crawford County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Monona County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Story County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Knox County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Clay County, SD, Union County, SD

The radar

The Omaha radar (KOAX), 126 km from the middle of the area, began a volume at 01:27 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.

Severe Thunderstorm Watch 674Jul 24, 9:45 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.4 hours before the alert went out and 126 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: 760 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 2517 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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.

Issued	Product	Office	Counties	Lasted
Jul 24, 8:20 PM CDT	Severe Thunderstorm Watch	SPC	Black Hawk, Bremer, Buchanan, Chickasaw, Clayton, Delaware and 2 more	5 hr
Jul 24, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	5 hr
Jul 24, 11:11 PM CDT	Mesoscale Discussion	SPC	Dubuque	64 min
Jul 24, 11:45 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	60 min
Jul 25, 10:05 AM CDT	Severe Thunderstorm Watch	SPC	Cedar, Clinton, Des Moines, Henry, Jackson, Johnson and 7 more	7 hr
Jul 25, 1:31 PM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Des Moines, Dubuque, Henry, Jackson and 7 more	89 min
Jul 25, 1:55 PM CDT	Mesoscale Discussion	SPC	Black Hawk, Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo and 32 more	2 hr
Jul 25, 3:30 PM CDT	Tornado Watch	SPC	Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee, Chickasaw and 19 more	7 hr
Jul 25, 4:40 PM CDT	Tornado Watch	SPC	Allamakee, Clayton, Fayette, Winneshiek	7 hr
Jul 25, 4:53 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 20 more	67 min
Jul 25, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 17 more	4 hr
Jul 25, 6:56 PM CDT	Mesoscale Discussion	SPC	Allamakee, Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee and 18 more	94 min
Jul 24, 7:13 PM CDT	Mesoscale Discussion	SPC	Butte, Harding, Lawrence, Meade, Perkins	2 hr
Jul 24, 9:53 PM CDT	Mesoscale Discussion	SPC	Bennett, Custer, Fall River, Jackson, Oglala Lakota, Pennington	67 min
Jul 24, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	Bennett, Custer, Fall River, Haakon, Jackson, Lawrence and 2 more	4 hr
Jul 24, 11:23 PM CDT	Mesoscale Discussion	SPC	Bennett, Custer, Fall River, Haakon, Jackson, Lawrence and 2 more	67 min
Jul 25, 2:39 AM CDT	Mesoscale Discussion	SPC	Butte, Corson, Harding, Perkins	2 hr

Nearby

Mesoscale Discussions in Iowa, 2005 Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in South Dakota, 2005 Every mesoscale discussion in 2005

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.