Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 800

May 6, 200810 counties in Iowa; 53 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 6, 2008, 6:23 PM CDT for 10 counties in Iowa; 53 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 6, 2008, 6:23 PM CDT (23:23 UTC)
Expired: May 6, 2008, 8:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 63 counties

Audubon County, IA, Cass County, IA, Crawford County, IA, Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Pottawattamie County, IA, Shelby County, IA, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Chase County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Howard County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Otoe County, NE, Phelps 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, Valley County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 83 km from the middle of the area, began a volume at 23:22 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.

Severe Thunderstorm Watch 270May 6, 7:10 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.4 hours before the alert went out and 175 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: 468 J/kg
Mixed-layer CIN: -331 J/kg
Mixed-layer LCL: 1005 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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
May 6, 10:56 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 6 more	94 min
May 6, 12:03 PM CDT	Severe Thunderstorm Watch	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 15 more	7 hr
May 6, 2:22 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more	113 min
May 6, 2:50 PM CDT	Severe Thunderstorm Watch	SPC	Harrison, Monona, Pottawattamie, Shelby	7 hr
May 6, 1:58 PM CDT	Mesoscale Discussion	SPC	Arthur, Blaine, Boone, Brown, Chase, Cherry and 21 more	92 min
May 6, 3:46 PM CDT	Severe Thunderstorm Watch	SPC	Dundy, Hitchcock, Red Willow	6 hr

Nearby

Mesoscale Discussions in Nebraska, 2008 Mesoscale Discussions in Iowa, 2008 Every mesoscale discussion in 2008

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.