Alert archive / Nebraska / Mesoscale Discussions in 2020

Mesoscale Discussion 934

June 18, 202014 counties in Iowa; 16 counties in Kansas; 21 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2020, 3:48 PM CDT for 14 counties in Iowa; 16 counties in Kansas; 21 counties in Nebraska. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jun 18, 2020, 3:48 PM CDT (20:48 UTC)
Expired: Jun 18, 2020, 5:45 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

All 51 counties

Adair County, IA, Audubon County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Pottawattamie County, IA, Shelby County, IA, Barton County, KS, Clay County, KS, Cloud County, KS, Ellis County, KS, Ellsworth County, KS, Jewell County, KS, Lincoln County, KS, Marshall County, KS, Mitchell County, KS, Osborne County, KS, Ottawa County, KS, Republic County, KS, Rice County, KS, Russell County, KS, Saline County, KS, Washington County, KS, Burt County, NE, Butler County, NE, Cass County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 84 km from the middle of the area, began a volume at 20:50 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

Omaha, NE (KOAX), launched 12:00Z, 8.8 hours before the alert went out and 84 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: 154 J/kg
Mixed-layer CIN: -296 J/kg
Mixed-layer LCL: 1431 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 102 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 18, 3:39 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 13 more	96 min
Jun 18, 6:30 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Clarke, Dallas and 19 more	2 hr
Jun 17, 9:23 PM CDT	Mesoscale Discussion	SPC	Arthur, Brown, Cherry, Grant, Hooker, Keya Paha and 1 more	2 hr
Jun 17, 11:16 PM CDT	Mesoscale Discussion	SPC	Arthur, Blaine, Brown, Cherry, Grant, Hooker and 4 more	89 min

Nearby

Mesoscale Discussions in Nebraska, 2020 Mesoscale Discussions in Kansas, 2020 Mesoscale Discussions in Iowa, 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.