Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1857

August 3, 200414 counties in Iowa; 17 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 3:00 PM CDT for 14 counties in Iowa; 17 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 3, 2004, 3:00 PM CDT (20:00 UTC)
Expired
Aug 3, 2004, 5:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 31 counties

Adair County, IA, Audubon County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Monona County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Woodbury County, IA, Boone County, NE, Burt County, NE, Butler County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dodge County, NE, Douglas County, NE, Greeley County, NE, Madison County, NE, Nance County, NE, Platte County, NE, Saunders County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 58 km from the middle of the area, began a volume at 20:02 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, 8.0 hours before the alert went out and 58 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 2004-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1625 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 12:00Z on 2004-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
1625 J/kg
Mixed-layer CIN
-306 J/kg
Mixed-layer LCL
1720 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
106 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
Aug 3, 2:02 AM CDTMesoscale DiscussionSPCBenton, Black Hawk, Boone, Buena Vista, Butler, Calhoun and 30 more118 min
Aug 3, 7:21 AM CDTMesoscale DiscussionSPCLyon54 min
Aug 3, 10:48 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Buena Vista, Butler and 32 more87 min
Aug 3, 11:05 AM CDTSevere Thunderstorm WatchSPCBremer, Buena Vista, Butler, Calhoun, Cerro Gordo, Cherokee and 25 more6 hr
Aug 3, 1:16 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 46 more89 min
Aug 3, 2:25 PM CDTSevere Thunderstorm WatchSPCAllamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more5 hr
Aug 3, 3:55 PM CDTMesoscale DiscussionSPCAdair, Appanoose, Benton, Black Hawk, Boone, Buchanan and 43 more95 min
Aug 3, 4:25 PM CDTTornado WatchSPCAppanoose, Benton, Black Hawk, Boone, Buchanan, Cedar and 39 more6 hr
Aug 3, 4:52 PM CDTMesoscale DiscussionSPCAdams, Audubon, Cass, Fremont, Harrison, Mills and 5 more53 min
Aug 3, 5:00 PM CDTTornado WatchSPCAdair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more5 hr
Aug 3, 5:07 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette, Winneshiek53 min
Aug 3, 5:39 PM CDTMesoscale DiscussionSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 32 more66 min
Aug 3, 6:34 PM CDTMesoscale DiscussionSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 28 more86 min
Aug 3, 6:45 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more90 min
Aug 2, 7:47 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Boyd, Brown, Cedar and 15 more58 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.