Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 1390

June 15, 20086 counties in Iowa; 24 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 15, 2008, 6:41 AM CDT for 6 counties in Iowa; 24 counties in Nebraska. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 15, 2008, 6:41 AM CDT (11:41 UTC)
Expired: Jun 15, 2008, 7:45 AM CDT
In force: 64 min
Issued by: the Storm Prediction Center

All 30 counties

Crawford County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Pottawattamie County, IA, Shelby County, IA, Adams County, NE, 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, Howard County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Washington County, NE, York County, NE

The radar

The Omaha radar (KOAX), 69 km from the middle of the area, began a volume at 11:41 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 537Jun 15, 6:55 AM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 11.7 hours before the alert went out and 69 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: 308 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 2405 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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 15, 1:02 AM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Buchanan, Buena Vista, Butler and 14 more	58 min
Jun 15, 2:01 AM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 44 more	5 hr
Jun 15, 3:35 AM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Buchanan, Cedar, Clinton, Delaware and 7 more	55 min
Jun 15, 5:10 AM CDT	Severe Thunderstorm Watch	SPC	Des Moines, Louisa	5 hr
Jun 15, 6:54 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Cass, Clarke, Dallas and 17 more	7 hr
Jun 15, 11:17 AM CDT	Mesoscale Discussion	SPC	Davis, Des Moines, Henry, Jefferson, Lee, Louisa and 2 more	88 min
Jun 15, 11:42 AM CDT	Severe Thunderstorm Watch	SPC	Des Moines, Henry, Iowa, Jefferson, Johnson, Keokuk and 6 more	7 hr
Jun 15, 1:16 PM CDT	Mesoscale Discussion	SPC	Richardson	119 min

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.