Alert archive / Nebraska / Mesoscale Discussions in 2020

Mesoscale Discussion 580

May 13, 20204 states

The Storm Prediction Center issued this mesoscale discussion at May 13, 2020, 11:48 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 13, 2020, 11:48 PM CDT (04:48 UTC)
Expired: May 14, 2020, 2:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 44 counties

Adams County, IA, Decatur County, IA, Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Doniphan County, KS, Jewell County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Republic County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Cass 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, Richardson County, NE, Saline County, NE, Thayer County, NE

The radar

The Topeka radar (KTWX), 128 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

Topeka, KS (KTOP), launched 00:00Z, 4.8 hours before the alert went out and 125 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: 100 J/kg
Mixed-layer CIN: -405 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 258 m²/s²
0-3 km storm-relative helicity: 392 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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
May 14, 3:55 PM CDT	Mesoscale Discussion	SPC	Appanoose, Clarke, Davis, Decatur, Jefferson, Lucas and 6 more	95 min
May 14, 4:24 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Clarke, Dallas, Davis, Decatur, Jasper and 13 more	9 hr
May 14, 5:19 PM CDT	Mesoscale Discussion	SPC	Des Moines, Henry, Jefferson, Lee, Louisa, Muscatine and 3 more	116 min
May 14, 6:01 PM CDT	Mesoscale Discussion	SPC	Appanoose, Clarke, Decatur, Lucas, Ringgold, Wayne	119 min
May 14, 6:15 PM CDT	Severe Thunderstorm Watch	SPC	Cedar, Clinton, Des Moines, Henry, Iowa, Jefferson and 8 more	8 hr
May 14, 1:41 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Camden, Cedar and 29 more	2 hr

Nearby

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