Alert archive / Nebraska / Mesoscale Discussions in 2020

Mesoscale Discussion 1648

August 30, 202011 counties in Kansas; 24 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 30, 2020, 11:42 PM CDT for 11 counties in Kansas; 24 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 30, 2020, 11:42 PM CDT (04:42 UTC)
Expired: Aug 31, 2020, 1:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

All 35 counties

Cloud County, KS, Jewell County, KS, Lincoln County, KS, Mitchell County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Washington County, KS, Adams County, NE, Buffalo County, NE, Butler County, NE, Clay County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Seward County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 23 km from the middle of the area, began a volume at 04:44 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, 4.7 hours before the alert went out and 195 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: 204 J/kg
Mixed-layer CIN: -312 J/kg
Mixed-layer LCL: 1578 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 174 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
Aug 31, 4:18 AM CDT	Mesoscale Discussion	SPC	Cherokee, Crawford, Labette, Neosho	117 min
Aug 31, 4:56 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Douglas, Franklin, Jackson and 8 more	2 hr
Aug 31, 8:41 AM CDT	Severe Thunderstorm Watch	SPC	Bourbon, Crawford, Linn, Miami	5 hr
Aug 31, 3:34 PM CDT	Mesoscale Discussion	SPC	Bourbon, Cherokee, Crawford, Labette, Montgomery, Neosho	86 min
Aug 31, 3:53 PM CDT	Severe Thunderstorm Watch	SPC	Chautauqua, Cherokee, Crawford, Labette, Montgomery, Neosho	10 hr
Aug 31, 6:13 PM CDT	Mesoscale Discussion	SPC	Chautauqua, Cherokee, Labette, Montgomery	92 min
Aug 30, 8:00 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Buffalo and 18 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 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.