Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 1852

August 22, 20077 counties in Iowa; 9 counties in Kansas; 53 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2007, 6:33 PM CDT for 7 counties in Iowa; 9 counties in Kansas; 53 counties in Nebraska. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Aug 22, 2007, 6:33 PM CDT (23:33 UTC)
Expired: Aug 22, 2007, 8:00 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 69 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Decatur County, KS, Graham County, KS, Jewell County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Sheridan County, KS, Smith County, KS, Thomas County, KS, Adams County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gage County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Lincoln County, NE, Logan County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Red Willow County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Washington County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The Omaha radar (KOAX), 89 km from the middle of the area, began a volume at 23:35 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.6 hours before the alert went out and 88 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: 1071 J/kg
Mixed-layer CIN: -277 J/kg
Mixed-layer LCL: 1229 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Aug 21, 8:14 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Buchanan, Chickasaw, Clayton, Delaware, Dubuque and 5 more	8 hr
Aug 21, 10:49 PM CDT	Mesoscale Discussion	SPC	Allamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 37 more	86 min
Aug 22, 2:13 AM CDT	Mesoscale Discussion	SPC	Jackson	62 min
Aug 22, 6:45 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 13 more	60 min
Aug 22, 10:12 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Cherokee, Clay, Crawford, Humboldt and 8 more	93 min
Aug 22, 2:37 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 40 more	83 min
Aug 22, 3:20 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more	6 hr
Aug 21, 8:28 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Ellis, Gove, Graham, Jewell and 15 more	92 min
Aug 22, 6:48 PM CDT	Severe Thunderstorm Watch	SPC	Greeley, Logan, Sherman, Wallace, Wichita	5 hr
Aug 22, 5:31 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cheyenne, Deuel, Garden and 5 more	89 min

Nearby

Mesoscale Discussions in Nebraska, 2007 Mesoscale Discussions in Kansas, 2007 Mesoscale Discussions in Iowa, 2007 Every mesoscale discussion in 2007

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.