Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1037

May 30, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 30, 2011, 10:38 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 30, 2011, 10:38 PM CDT (03:38 UTC)
Expired: May 31, 2011, 12:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 66 counties

Cherokee County, IA, Harrison County, IA, Ida County, IA, Monona County, IA, Plymouth County, IA, Woodbury County, IA, Barber County, KS, Barton County, KS, Clay County, KS, Cloud County, KS, Comanche County, KS, Dickinson County, KS, Edwards County, KS, Ellsworth County, KS, Ford County, KS, Geary County, KS, Jewell County, KS, Kiowa County, KS, Lincoln County, KS, Marshall County, KS, McPherson County, KS, Mitchell County, KS, Osborne County, KS, Ottawa County, KS, Pawnee County, KS, Pratt County, KS, Republic County, KS, Rice County, KS, Riley County, KS, Rush County, KS, Russell County, KS, Saline County, KS, Stafford County, KS, Washington County, KS, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, York County, NE, Union County, SD

The radar

The Grand Island radar (KUEX), 81 km from the middle of the area, began a volume at 03:39 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, 3.6 hours before the alert went out and 183 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: 2253 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 998 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 331 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 4.9

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 30, 8:37 PM CDT	Severe Thunderstorm Watch PDS	SPC	Cherokee, Harrison, Monona, Plymouth, Woodbury	5 hr
May 30, 8:43 PM CDT	Tornado Watch	SPC	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	5 hr
May 30, 10:09 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	2 hr
May 30, 8:13 PM CDT	Mesoscale Discussion	SPC	Barton, Cloud, Edwards, Ellis, Ellsworth, Ford and 24 more	92 min

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Kansas, 2011 Mesoscale Discussions in Iowa, 2011 Every mesoscale discussion in 2011

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.