Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 831

May 22, 200415 counties in Iowa; 24 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 22, 2004, 7:23 PM CDT for 15 counties in Iowa; 24 counties in Nebraska. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
May 22, 2004, 7:23 PM CDT (00:23 UTC)
Expired
May 22, 2004, 8:30 PM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 39 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Dallas County, IA, Fremont County, IA, Guthrie County, IA, Jasper County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Polk County, IA, Pottawattamie County, IA, Union County, IA, Warren County, IA, Adams County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nuckolls County, NE, Otoe County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Omaha radar (KOAX), 49 km from the middle of the area, began a volume at 00:25 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, 0.4 hours before the alert went out and 49 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 2004-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2882 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 2004-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
2882 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1091 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
260 m²/s²
Significant tornado parameter
4.2
Supercell composite
16.7

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 22, 7:11 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Cass, Clarke, Dallas and 15 more94 min
May 22, 8:58 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Boone and 49 more92 min
May 22, 10:40 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Benton, Cedar, Clarke and 33 more5 hr
May 22, 11:33 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Benton, Cedar, Clarke and 33 more87 min
May 23, 12:24 AM CDTMesoscale DiscussionSPCCedar, Clinton, Des Moines, Dubuque, Jackson, Jones and 3 more66 min
May 23, 12:40 AM CDTSevere Thunderstorm WatchSPCClinton, Dubuque, Jackson, Scott5 hr
May 23, 2:21 AM CDTMesoscale DiscussionSPCAppanoose, Buchanan, Cedar, Davis, Delaware, Des Moines and 14 more54 min
May 23, 4:30 AM CDTMesoscale DiscussionSPCClinton, Des Moines, Jackson, Lee, Louisa, Muscatine and 1 more60 min
May 23, 12:25 PM CDTMesoscale DiscussionSPCCedar, Clinton, Delaware, Des Moines, Dubuque, Henry and 7 more95 min
May 23, 1:15 PM CDTTornado WatchSPCDes Moines, Lee6 hr
May 23, 2:05 PM CDTTornado WatchSPCAllamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 14 more8 hr
May 23, 5:10 PM CDTMesoscale DiscussionSPCClinton, Dubuque, Jackson, Scott95 min
May 23, 1:21 AM CDTMesoscale DiscussionSPCRichardson24 min
May 23, 6:50 PM CDTMesoscale DiscussionSPCDawes, Sioux85 min

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Iowa, 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.