Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 811

May 21, 20048 counties in Kansas; 39 counties in Nebraska; 14 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 21, 2004, 10:01 PM CDT for 8 counties in Kansas; 39 counties in Nebraska; 14 counties in South Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
May 21, 2004, 10:01 PM CDT (03:01 UTC)
Expired
May 21, 2004, 11:30 PM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 61 counties

Cloud County, KS, Jewell County, KS, Mitchell County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Fillmore County, NE, Franklin County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Loup 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, Rock County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD, Yankton County, SD

The radar

The Grand Island radar (KUEX), 88 km from the middle of the area, began a volume at 03:01 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 3.0 hours before the alert went out and 170 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, N. Platte/Lee Bi, NE at 00:00Z on 2004-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2197 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, N. Platte/Lee Bi, NE at 00:00Z on 2004-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 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
2197 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1985 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
266 m²/s²
Significant tornado parameter
0.0
Supercell composite
19.7

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 21, 7:40 PM CDTTornado WatchSPCCloud, Jewell, Mitchell, Osborne, Phillips, Republic and 2 more5 hr
May 21, 8:40 PM CDTMesoscale DiscussionSPCClark, Edwards, Ellis, Ford, Gray, Hodgeman and 8 more95 min
May 22, 1:13 PM CDTMesoscale DiscussionSPCCheyenne2 hr
May 22, 2:00 PM CDTTornado WatchSPCCheyenne, Rawlins, Sherman, Thomas6 hr
May 22, 3:04 PM CDTMesoscale DiscussionSPCCheyenne86 min
May 22, 3:52 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Clay, Cloud, Comanche and 20 more83 min
May 22, 5:50 PM CDTTornado WatchSPCBarton, Clay, Cloud, Dickinson, Ellsworth, Geary and 13 more5 hr
May 21, 9:55 PM CDTTornado WatchSPCBurt, Cuming, Dakota, Dixon, Dodge, Thurston and 1 more4 hr
May 22, 12:25 AM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Buffalo, Burt, Butler and 29 more2 hr
May 22, 12:55 AM CDTSevere Thunderstorm WatchSPCAdams, Boone, Buffalo, Burt, Butler, Cass and 31 more5 hr
May 22, 3:44 AM CDTMesoscale DiscussionSPCAdams, Buffalo, Burt, Butler, Cass, Clay and 20 more61 min
May 22, 3:02 PM CDTMesoscale DiscussionSPCAdams, Butler, Cass, Clay, Douglas, Fillmore and 22 more58 min
May 22, 3:45 PM CDTTornado WatchSPCAdams, Boone, Buffalo, Burt, Butler, Cass and 44 more7 hr

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in South Dakota, 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.