Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 605

May 8, 200425 counties in Iowa; Atchison County, Missouri; 26 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 8, 2004, 7:54 PM CDT for 25 counties in Iowa; Atchison County, Missouri; 26 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 8, 2004, 7:54 PM CDT (00:54 UTC)
Expired
May 8, 2004, 10:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 52 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Atchison County, MO, Butler County, NE, Cass County, NE, Clay County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee 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), 56 km from the middle of the area, began a volume at 00:54 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, 0.9 hours before the alert went out and 56 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 2004-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2163 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 2004-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
2163 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
2150 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
104 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
May 8, 8:25 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Allamakee, Appanoose, Audubon, Benton and 58 more6 hr
May 8, 10:44 PM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Clarke, Decatur, Fremont and 12 more2 hr
May 9, 1:22 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Cass, Cedar, Clarke and 30 more23 min
May 9, 2:30 PM CDTSevere Thunderstorm WatchSPCLyon, Sioux6 hr
May 9, 4:46 PM CDTMesoscale DiscussionSPCAllamakee, Buchanan, Clayton, Clinton, Delaware, Dubuque and 4 more59 min
May 9, 5:38 PM CDTMesoscale DiscussionSPCDickinson, Emmet, Lyon, Osceola, Sioux2 hr
May 8, 9:17 PM CDTMesoscale DiscussionSPCBoyd88 min
May 9, 2:42 PM CDTMesoscale DiscussionSPCArthur, Blaine, Brown, Chase, Cherry, Custer and 19 more3 hr
May 9, 3:30 PM CDTSevere Thunderstorm WatchSPCAdams, Antelope, Blaine, Boone, Boyd, Buffalo and 29 more6 hr
May 9, 6:12 PM CDTMesoscale DiscussionSPCAdams, Antelope, Blaine, Boone, Buffalo, Butler and 37 more2 hr

Nearby

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