Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 811

May 26, 201333 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 26, 2013, 6:55 PM CDT for 33 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 26, 2013, 6:55 PM CDT (23:55 UTC)
Expired: May 26, 2013, 9:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 33 counties

Adams County, NE, Blaine County, NE, Boone County, NE, Buffalo County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Kearney County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Seward County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 118 km from the middle of the area, began a volume at 23:56 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 223May 26, 7:35 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.9 hours before the alert went out and 225 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: 563 J/kg
Mixed-layer CIN: -131 J/kg
Mixed-layer LCL: 525 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 25, 7:36 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Blaine, Buffalo, Custer, Dawson, Franklin and 16 more	4 hr
May 25, 9:43 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Buffalo, Butler and 35 more	92 min
May 25, 10:59 PM CDT	Mesoscale Discussion	SPC	Cedar, Dakota, Dixon, Knox, Thurston, Wayne	91 min
May 26, 3:03 PM CDT	Mesoscale Discussion	SPC	Arthur, Blaine, Buffalo, Custer, Dawson, Garden and 8 more	87 min
May 26, 3:49 PM CDT	Mesoscale Discussion	SPC	Banner, Kimball, Scotts Bluff, Sioux	56 min
May 26, 6:47 PM CDT	Mesoscale Discussion	SPC	Cass, Douglas, Johnson, Lancaster, Nemaha, Otoe and 3 more	88 min

Nearby

Mesoscale Discussions in Nebraska, 2013 Every mesoscale discussion in 2013

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.