Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 707

April 23, 20087 counties in Iowa; Atchison County, Gentry County, Nodaway County, Missouri; 57 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2008, 4:34 PM CDT for 7 counties in Iowa; Atchison County, Gentry County, Nodaway County, Missouri; 57 counties in Nebraska. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2008, 4:34 PM CDT (21:34 UTC)
Expired
Apr 23, 2008, 6:30 PM CDT
In force
116 min
Issued by
the Storm Prediction Center
All 67 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Taylor County, IA, Atchison County, MO, Gentry County, MO, Nodaway County, MO, Adams County, NE, Antelope County, NE, Blaine County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass 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, Gage County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Rock 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 Omaha radar (KOAX), 99 km from the middle of the area, began a volume at 21:34 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, 9.6 hours before the alert went out and 99 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2008-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2008-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2107 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
66 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.

IssuedProductOfficeCountiesLasted
Apr 23, 4:04 PM CDTMesoscale DiscussionSPCFremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more2 hr
Apr 23, 12:13 PM CDTMesoscale DiscussionSPCBates, Cass, Jackson, Vernon92 min
Apr 23, 3:37 PM CDTMesoscale DiscussionSPCBarton, Jasper, McDonald, Newton, Vernon53 min
Apr 23, 1:16 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more2 hr
Apr 23, 2:25 PM CDTTornado WatchSPCArthur, Box Butte, Chase, Cherry, Cheyenne, Dawes and 17 more8 hr
Apr 23, 5:58 PM CDTTornado WatchSPCBlaine, Brown, Custer, Garfield, Holt, Keya Paha and 2 more4 hr

Nearby

Mesoscale Discussions in Nebraska, 2008Mesoscale Discussions in Iowa, 2008Mesoscale Discussions in Missouri, 2008Every 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.