Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 677

June 8, 2018Plymouth County, Iowa; 37 counties in Nebraska; 13 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2018, 11:51 PM CDT for Plymouth County, Iowa; 37 counties in Nebraska; 13 counties in South Dakota. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jun 8, 2018, 11:51 PM CDT (04:51 UTC)
Expired: Jun 9, 2018, 1:15 AM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 51 counties

Plymouth County, IA, Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Keya Paha County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Rock County, NE, Sherman County, NE, Stanton County, NE, Thomas County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 169 km from the middle of the area, began a volume at 04:50 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.9 hours before the alert went out and 229 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: 3615 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1405 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.5

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
Jun 9, 2:51 AM CDT	Mesoscale Discussion	SPC	Audubon, Carroll, Cass, Crawford, Fremont, Greene and 10 more	114 min
Jun 9, 1:46 PM CDT	Mesoscale Discussion	SPC	Bremer, Butler, Cerro Gordo, Chickasaw, Floyd, Franklin and 6 more	119 min
Jun 9, 2:26 PM CDT	Tornado Watch	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 18 more	5 hr
Jun 9, 3:52 PM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 23 more	83 min
Jun 9, 6:30 PM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 22 more	2 hr
Jun 8, 8:40 PM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boyd, Brown, Cedar, Cherry and 7 more	95 min
Jun 9, 1:16 AM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Burt, Butler, Clay, Colfax and 30 more	89 min
Jun 9, 3:50 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Lawrence	2 hr

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.