Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1645

August 31, 20145 states

The Storm Prediction Center issued this mesoscale discussion at Aug 31, 2014, 2:20 PM CDT for 5 states. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Aug 31, 2014, 2:20 PM CDT (19:20 UTC)
Expired: Aug 31, 2014, 3:45 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 118 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Fremont County, IA, Greene County, IA, Hancock County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Cloud County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Washington County, KS, Blue Earth County, MN, Brown County, MN, Carver County, MN, Cottonwood County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Le Sueur County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Yellow Medicine County, MN, Adams 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, Gage County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Pierce 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, Webster County, NE, York County, NE, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Union County, SD

The radar

The Omaha radar (KOAX), 75 km from the middle of the area, began a volume at 19:21 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 479Aug 31, 3:35 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.3 hours before the alert went out and 75 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: 282 J/kg
Mixed-layer CIN: -342 J/kg
Mixed-layer LCL: 1715 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 227 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
Aug 31, 3:31 PM CDT	Tornado Watch	SPC	Buena Vista, Cherokee, Clay, Crawford, Dickinson, Emmet and 14 more	5 hr
Aug 31, 6:07 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 28 more	83 min
Aug 31, 6:56 PM CDT	Severe Thunderstorm Watch	SPC	Bremer, Butler, Cerro Gordo, Chickasaw, Floyd, Franklin and 8 more	6 hr
Aug 31, 3:46 PM CDT	Mesoscale Discussion	SPC	Finney, Gray, Haskell, Kearny, Meade, Seward	119 min
Aug 31, 5:17 PM CDT	Mesoscale Discussion	SPC	Barton, Edwards, Ellsworth, Ford, Gray, Harvey and 12 more	58 min
Aug 31, 5:34 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Barton, Brown, Chase, Clark, Coffey and 33 more	9 hr
Aug 31, 5:44 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Blue Earth, Brown, Carlton and 31 more	91 min
Aug 30, 7:27 PM CDT	Severe Thunderstorm Watch	SPC	Butte, Corson, Dewey, Haakon, Harding, Lawrence and 5 more	4 hr
Aug 30, 11:00 PM CDT	Mesoscale Discussion	SPC	Campbell, Dewey, Edmunds, Hughes, McPherson, Potter and 3 more	90 min

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.