Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 1668

August 6, 200716 counties in Iowa; 25 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2007, 10:28 PM CDT for 16 counties in Iowa; 25 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 6, 2007, 10:28 PM CDT (03:28 UTC)
Expired: Aug 7, 2007, 1:30 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 41 counties

Adair County, IA, Audubon County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Woodbury County, IA, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Hall County, NE, Hamilton County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Otoe County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, York County, NE

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.5 hours before the alert went out and 14 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: 2407 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1157 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 362 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 22.6

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 6, 7:24 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 42 more	96 min
Aug 7, 1:58 PM CDT	Mesoscale Discussion	SPC	Adams, Appanoose, Cedar, Clarke, Clinton, Davis and 29 more	2 hr
Aug 7, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Cass, Cedar, Clarke and 32 more	6 hr
Aug 7, 1:46 AM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Franklin, Hall, Harlan and 3 more	89 min
Aug 7, 2:24 PM CDT	Mesoscale Discussion	SPC	Dawes, Sioux	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2007 Mesoscale Discussions in Iowa, 2007 Every mesoscale discussion in 2007

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.