Alert archive / Nebraska / Mesoscale Discussions in 2020

Mesoscale Discussion 1064

June 30, 202039 counties in Nebraska; 22 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2020, 9:26 PM CDT for 39 counties in Nebraska; 22 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 30, 2020, 9:26 PM CDT (02:26 UTC)
Expired: Jun 30, 2020, 11:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 320

All 61 counties

Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Dixon County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Yankton County, SD

The radar

The Grand Island radar (KUEX), 166 km from the middle of the area, began a volume at 02:25 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 00:00Z, 2.4 hours before the alert went out and 187 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: 3121 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1165 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 59 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
Jun 30, 10:46 PM CDT	Mesoscale Discussion	SPC	Burt, Butler, Cass, Colfax, Cuming, Dakota and 12 more	89 min
Jun 30, 11:25 PM CDT	Severe Thunderstorm Watch	SPC	Burt, Cass, Dodge, Douglas, Gage, Jefferson and 9 more	7 hr
Jul 1, 1:48 AM CDT	Mesoscale Discussion	SPC	Gage, Jefferson, Johnson, Lancaster, Nemaha, Otoe and 4 more	87 min
Jun 30, 8:38 PM CDT	Mesoscale Discussion	SPC	Brown, Clark, Codington, Day, Hamlin, Marshall and 2 more	67 min

Nearby

Mesoscale Discussions in Nebraska, 2020 Mesoscale Discussions in South Dakota, 2020 Every mesoscale discussion in 2020

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.