Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 2269

September 24, 200519 counties in Iowa; 31 counties in Nebraska; 4 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 24, 2005, 3:26 PM CDT for 19 counties in Iowa; 31 counties in Nebraska; 4 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Sep 24, 2005, 3:26 PM CDT (20:26 UTC)
Expired: Sep 24, 2005, 5:00 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 54 counties

Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Garfield County, NE, Greeley County, NE, Howard County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saunders County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, Clay County, SD, Lincoln County, SD, Union County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 129 km from the middle of the area, began a volume at 20:30 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 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, 8.4 hours before the alert went out and 129 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: 58 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 332 m²/s²
0-3 km storm-relative helicity: 397 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.5

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
Sep 24, 7:14 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Dickinson, Emmet, Hancock and 10 more	2 hr
Sep 24, 3:55 PM CDT	Tornado Watch	SPC	Cherokee, Harrison, Ida, Lyon, Monona, O'Brien and 5 more	7 hr
Sep 24, 1:03 AM CDT	Mesoscale Discussion	SPC	Boyd, Cedar, Dakota, Dixon, Knox, Wayne	57 min
Sep 24, 5:57 PM CDT	Mesoscale Discussion	SPC	Dawson, Dundy, Frontier, Furnas, Gosper, Hayes and 3 more	93 min

Nearby

Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in Iowa, 2005 Mesoscale Discussions in South Dakota, 2005 Every mesoscale discussion in 2005

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.