Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 118

February 20, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2014, 5:28 AM CST for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Feb 20, 2014, 5:28 AM CST (11:28 UTC)
Expired: Feb 20, 2014, 10:00 AM CST
In force: 5 hr
Issued by: the Storm Prediction Center

All 36 counties

Cherokee County, IA, Harrison County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Murray County, MN, Nobles County, MN, Rock County, MN, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Otoe County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Clay County, SD, Lincoln County, SD, Union County, SD

The radar

The Omaha radar (KOAX), 47 km from the middle of the area, began a volume at 11:30 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, 11.5 hours before the alert went out and 47 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2198 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 332 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Feb 20, 4:24 AM CST	Mesoscale Discussion	SPC	Decatur, Ringgold	2 hr
Feb 20, 10:20 AM CST	Mesoscale Discussion	SPC	Appanoose, Benton, Buchanan, Cedar, Clarke, Clinton and 31 more	85 min
Feb 20, 11:20 AM CST	Mesoscale Discussion	SPC	Adair, Audubon, Black Hawk, Boone, Bremer, Buena Vista and 39 more	6 hr

Nearby

Mesoscale Discussions in Nebraska, 2014 Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Minnesota, 2014 Every mesoscale discussion in 2014

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.