Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 812

May 22, 200420 counties in Iowa; 35 counties in Nebraska; 4 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 22, 2004, 12:25 AM CDT for 20 counties in Iowa; 35 counties in Nebraska; 4 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 22, 2004, 12:25 AM CDT (05:25 UTC)
Expired
May 22, 2004, 2:30 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 59 counties

Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Monona County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Shelby County, IA, Webster County, IA, Woodbury County, IA, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Fillmore County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Kearney County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Clay County, SD, Minnehaha County, SD, Turner County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 103 km from the middle of the area, began a volume at 05:26 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 00:00Z, 5.4 hours before the alert went out and 103 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 00:00Z on 2004-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2589 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2004-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.19395878Sfc1 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
2589 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1462 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
166 m²/s²
Significant tornado parameter
0.6
Supercell composite
6.9

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
May 21, 7:37 PM CDTMesoscale DiscussionSPCAudubon, Benton, Black Hawk, Boone, Bremer, Buchanan and 48 more83 min
May 21, 9:55 PM CDTTornado WatchSPCAudubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 14 more4 hr
May 22, 12:05 AM CDTSevere Thunderstorm WatchSPCBenton, Black Hawk, Bremer, Buchanan, Butler, Cedar and 26 more6 hr
May 22, 12:55 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 17 more5 hr
May 22, 2:41 AM CDTMesoscale DiscussionSPCBenton, Black Hawk, Buchanan, Cedar, Clayton, Clinton and 24 more94 min
May 22, 3:44 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Cass, Dallas and 11 more61 min
May 22, 6:58 AM CDTMesoscale DiscussionSPCAppanoose, Davis, Decatur, Des Moines, Henry, Jefferson and 6 more62 min
May 22, 3:02 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 29 more58 min
May 22, 3:45 PM CDTTornado WatchSPCFremont, Harrison, Mills, Pottawattamie, Shelby7 hr
May 22, 5:52 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Benton, Black Hawk, Boone and 53 more113 min
May 22, 6:15 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Benton, Boone and 47 more6 hr
May 21, 7:40 PM CDTTornado WatchSPCAdams, Antelope, Boone, Boyd, Buffalo, Butler and 33 more5 hr
May 21, 10:01 PM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Butler and 33 more89 min
May 22, 1:13 PM CDTMesoscale DiscussionSPCBanner, Chase, Cheyenne, Deuel, Dundy, Keith and 2 more2 hr
May 22, 2:00 PM CDTTornado WatchSPCArthur, Banner, Chase, Cheyenne, Deuel, Dundy and 12 more6 hr
May 22, 3:04 PM CDTMesoscale DiscussionSPCBanner, Chase, Cheyenne, Deuel, Dundy, Keith and 2 more86 min

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in South Dakota, 2004Every mesoscale discussion in 2004

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.