Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 1009

July 4, 2018Monona County, Plymouth County, Woodbury County, Iowa; 22 counties in Nebraska; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2018, 2:01 PM CDT for Monona County, Plymouth County, Woodbury County, Iowa; 22 counties in Nebraska; 6 counties in South Dakota. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2018, 2:01 PM CDT (19:01 UTC)
Expired: Jul 4, 2018, 4:00 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 31 counties

Monona County, IA, Plymouth County, IA, Woodbury County, IA, Antelope County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Garfield County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Pierce County, NE, Rock County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Gregory County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 164 km from the middle of the area, began a volume at 19:04 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, 7.0 hours before the alert went out and 198 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: 762 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1648 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -53 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 9:56 AM CDT	Mesoscale Discussion	SPC	Allamakee, Chickasaw, Howard, Mitchell, Winneshiek	2 hr
Jul 4, 10:27 AM CDT	Mesoscale Discussion	SPC	Audubon, Black Hawk, Boone, Bremer, Buena Vista, Butler and 35 more	2 hr
Jul 4, 5:35 PM CDT	Mesoscale Discussion	SPC	Plymouth	115 min
Jul 3, 7:36 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Chase, Cheyenne, Deuel, Dundy and 11 more	54 min
Jul 4, 2:51 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cheyenne, Deuel, Garden and 7 more	54 min
Jul 3, 9:38 PM CDT	Mesoscale Discussion	SPC	Bennett, Butte, Custer, Fall River, Haakon, Harding and 7 more	2 hr
Jul 3, 10:38 PM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Clark, Corson, Day, Dewey and 14 more	97 min
Jul 3, 11:02 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Campbell, Clark, Corson, Day, Dewey and 13 more	6 hr
Jul 4, 3:14 AM CDT	Mesoscale Discussion	SPC	Beadle, Brown, Clark, Codington, Day, Edmunds and 14 more	91 min

Nearby

Mesoscale Discussions in Nebraska, 2018 Mesoscale Discussions in South Dakota, 2018 Mesoscale Discussions in Iowa, 2018 Every mesoscale discussion in 2018

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.