Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 805

May 21, 20047 counties in Kansas; 41 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 21, 2004, 5:35 PM CDT for 7 counties in Kansas; 41 counties in Nebraska. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
May 21, 2004, 5:35 PM CDT (22:35 UTC)
Expired
May 21, 2004, 7:30 PM CDT
In force
115 min
Issued by
the Storm Prediction Center
All 48 counties

Graham County, KS, Jewell County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Rooks County, KS, Smith County, KS, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dawson County, NE, Dixon County, NE, Dodge County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Kearney County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 32 km from the middle of the area, began a volume at 22:38 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, 10.6 hours before the alert went out and 230 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 2004-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 718 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 2004-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 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
718 J/kg
Mixed-layer CIN
-227 J/kg
Mixed-layer LCL
1161 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
160 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 20, 10:03 PM CDTMesoscale DiscussionSPCBrown, Cheyenne, Clay, Cloud, Decatur, Ellis and 23 more87 min
May 21, 4:50 PM CDTSevere Thunderstorm WatchSPCClark, Edwards, Ellis, Finney, Ford, Gove and 19 more5 hr
May 20, 10:30 PM CDTSevere Thunderstorm WatchSPCAdams, Buffalo, Butler, Chase, Clay, Colfax and 32 more6 hr
May 21, 1:11 AM CDTMesoscale DiscussionSPCAntelope, Arthur, Blaine, Boone, Boyd, Brown and 29 more34 min
May 21, 1:20 AM CDTSevere Thunderstorm WatchSPCAntelope, Boone, Boyd, Burt, Cedar, Colfax and 18 more6 hr
May 21, 2:22 AM CDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Burt, Cedar, Cuming and 11 more23 min
May 21, 2:22 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 3 more113 min
May 21, 3:05 PM CDTSevere Thunderstorm WatchSPCArthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 8 more5 hr
May 21, 4:57 PM CDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Hooker, Keya Paha, Logan and 2 more93 min
May 21, 6:33 PM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Burt and 44 more57 min

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Kansas, 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.