Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1566

July 10, 20116 counties in Iowa; 33 counties in Nebraska; Clay County, Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2011, 10:27 PM CDT for 6 counties in Iowa; 33 counties in Nebraska; Clay County, Union County, South Dakota. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jul 10, 2011, 10:27 PM CDT (03:27 UTC)
Expired: Jul 10, 2011, 11:30 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center

All 41 counties

Cherokee County, IA, Harrison County, IA, Monona County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Clay County, SD, Union County, SD

The radar

The Omaha radar (KOAX), 113 km from the middle of the area, began a volume at 03:28 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.5 hours before the alert went out and 112 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: 4133 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1304 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.7

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 10, 7:51 PM CDT	Mesoscale Discussion	SPC	Allamakee, Howard, Mitchell, Winneshiek	84 min
Jul 10, 9:53 PM CDT	Mesoscale Discussion	SPC	Allamakee, Cerro Gordo, Chickasaw, Dickinson, Emmet, Floyd and 9 more	67 min
Jul 10, 10:10 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 13 more	6 hr
Jul 10, 10:57 PM CDT	Severe Thunderstorm Watch	SPC	Harrison, Mills, Monona, Montgomery, Pottawattamie, Shelby	4 hr
Jul 10, 11:45 PM CDT	Mesoscale Discussion	SPC	Allamakee, Bremer, Cerro Gordo, Chickasaw, Clayton, Delaware and 8 more	90 min
Jul 10, 11:56 PM CDT	Severe Thunderstorm Watch	SPC	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more	4 hr
Jul 11, 1:08 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 38 more	13 min
Jul 11, 1:21 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 38 more	4 hr
Jul 11, 2:36 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Benton, Black Hawk, Boone, Bremer and 52 more	114 min
Jul 11, 3:30 AM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Benton, Buchanan, Cedar, Chickasaw, Clayton and 18 more	6 hr
Jul 11, 5:07 AM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Buchanan, Cedar, Clayton, Clinton and 15 more	113 min
Jul 10, 7:21 PM CDT	Mesoscale Discussion	SPC	Adams, Blaine, Brown, Buffalo, Chase, Custer and 29 more	84 min
Jul 10, 7:24 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Blaine, Boyd, Brown, Buffalo, Chase and 38 more	6 hr
Jul 11, 2:50 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 8 more	85 min
Jul 11, 3:07 PM CDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	7 hr
Jul 11, 5:01 PM CDT	Mesoscale Discussion	SPC	Cherry, Dawes, Sheridan	29 min
Jul 11, 5:06 PM CDT	Tornado Watch	SPC	Box Butte, Cherry, Dawes, Sheridan, Sioux	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Iowa, 2011 Mesoscale Discussions in South Dakota, 2011 Every mesoscale discussion in 2011

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.