Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1097

June 20, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2014, 5:40 PM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2014, 5:40 PM CDT (22:40 UTC)
Expired: Jun 20, 2014, 7:15 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center

All 69 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Crawford County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Webster County, IA, Woodbury County, IA, Jewell County, KS, Smith County, KS, Adams County, NE, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar 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, Franklin County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Otoe County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Union County, SD

The radar

The Omaha radar (KOAX), 88 km from the middle of the area, began a volume at 22:44 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 watches that followed

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

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.7 hours before the alert went out and 88 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: 2428 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 114 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
Jun 20, 2:20 PM CDT	Severe Thunderstorm Watch	SPC	Buena Vista, Cherokee, Clay, Ida, Monona, O'Brien and 3 more	9 hr
Jun 20, 5:44 PM CDT	Severe Thunderstorm Watch	SPC	Audubon, Boone, Calhoun, Carroll, Crawford, Dallas and 16 more	5 hr
Jun 20, 11:02 AM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boone, Buffalo, Butler, Colfax and 27 more	118 min
Jun 20, 3:18 PM CDT	Severe Thunderstorm Watch	SPC	Roberts	6 hr

Nearby

Mesoscale Discussions in Nebraska, 2014 Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Kansas, 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.