Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 785

May 20, 20045 states

The Storm Prediction Center issued this mesoscale discussion at May 20, 2004, 9:03 PM MDT for 5 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 20, 2004, 9:03 PM MDT (03:03 UTC)
Expired
May 20, 2004, 10:30 PM MDT
In force
87 min
Issued by
the Storm Prediction Center
All 89 counties

Cheyenne County, CO, Kit Carson County, CO, Phillips County, CO, Yuma County, CO, Fremont County, IA, Harrison County, IA, Mills County, IA, Pottawattamie County, IA, Brown County, KS, Cheyenne County, KS, Clay County, KS, Cloud County, KS, Decatur County, KS, Ellis County, KS, Gove County, KS, Graham County, KS, Jewell County, KS, Lincoln County, KS, Logan County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Norton County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Rawlins County, KS, Republic County, KS, Rooks County, KS, Russell County, KS, Sheridan County, KS, Sherman County, KS, Smith County, KS, Thomas County, KS, Trego County, KS, Wallace County, KS, Washington County, KS, Atchison County, MO, Holt County, MO, Adams County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Chase County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Dundy County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Perkins County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Red Willow County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 61 km from the middle of the area, began a volume at 03:03 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, 3.1 hours before the alert went out and 164 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 2004-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 49 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 2004-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 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
49 J/kg
Mixed-layer CIN
-385 J/kg
Mixed-layer LCL
1444 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
215 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, 6:15 PM MDTTornado WatchSPCAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 9 more5 hr
May 20, 9:04 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 9 more86 min
May 20, 9:30 PM MDTSevere Thunderstorm WatchSPCPhillips, Sedgwick, Yuma6 hr
May 20, 6:32 PM MDTMesoscale DiscussionSPCCedar, Clinton, Des Moines, Henry, Jefferson, Keokuk and 5 more88 min
May 21, 12:11 AM MDTMesoscale DiscussionSPCAudubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 27 more34 min
May 21, 12:20 AM MDTSevere Thunderstorm WatchSPCAudubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 19 more6 hr
May 21, 1:22 AM MDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 47 more23 min
May 21, 1:35 AM MDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 22 more4 hr
May 21, 3:34 AM MDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Buena Vista, Butler and 35 more56 min
May 21, 5:23 AM MDTMesoscale DiscussionSPCAllamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clay and 20 more67 min
May 21, 8:44 AM MDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Buena Vista and 38 more3 hr
May 21, 9:25 AM MDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 37 more6 hr
May 21, 12:59 PM MDTMesoscale DiscussionSPCBenton, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 9 more2 hr
May 21, 1:45 PM MDTTornado WatchSPCAllamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 59 more7 hr
May 21, 5:33 PM MDTMesoscale DiscussionSPCLyon, Plymouth, Sioux, Woodbury57 min
May 21, 3:50 PM MDTSevere Thunderstorm WatchSPCClark, Edwards, Ellis, Finney, Ford, Gove and 19 more5 hr
May 21, 4:35 PM MDTMesoscale DiscussionSPCGraham, Jewell, Norton, Osborne, Phillips, Rooks and 1 more115 min
May 21, 1:22 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 3 more113 min
May 21, 2:05 PM MDTSevere Thunderstorm WatchSPCArthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 8 more5 hr
May 21, 3:57 PM MDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Hooker, Keya Paha, Logan and 2 more93 min

Nearby

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