Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 829

May 22, 200421 counties in Iowa; Atchison County, Missouri; 27 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 22, 2004, 7:11 PM CDT for 21 counties in Iowa; Atchison County, Missouri; 27 counties in Nebraska. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: May 22, 2004, 7:11 PM CDT (00:11 UTC)
Expired: May 22, 2004, 8:45 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 49 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Atchison County, MO, Adams County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax 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, Nemaha County, NE, Nuckolls County, NE, Otoe 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), 34 km from the middle of the area, began a volume at 00:12 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.

Tornado Watch 256May 22, 10:40 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.2 hours before the alert went out and 34 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2882 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1091 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 260 m²/s²
Significant tornado parameter: 4.2
Supercell composite: 16.7

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.

Issued	Product	Office	Counties	Lasted
May 22, 7:23 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Dallas, Fremont and 9 more	67 min
May 22, 8:58 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Boone and 49 more	92 min
May 22, 10:40 PM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Benton, Cedar, Clarke and 33 more	5 hr
May 22, 11:33 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Benton, Cedar, Clarke and 33 more	87 min
May 23, 12:24 AM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Des Moines, Dubuque, Jackson, Jones and 3 more	66 min
May 23, 12:40 AM CDT	Severe Thunderstorm Watch	SPC	Clinton, Dubuque, Jackson, Scott	5 hr
May 23, 2:21 AM CDT	Mesoscale Discussion	SPC	Appanoose, Buchanan, Cedar, Davis, Delaware, Des Moines and 14 more	54 min
May 23, 4:30 AM CDT	Mesoscale Discussion	SPC	Clinton, Des Moines, Jackson, Lee, Louisa, Muscatine and 1 more	60 min
May 23, 12:25 PM CDT	Mesoscale Discussion	SPC	Cedar, Clinton, Delaware, Des Moines, Dubuque, Henry and 7 more	95 min
May 23, 1:15 PM CDT	Tornado Watch	SPC	Des Moines, Lee	6 hr
May 23, 2:05 PM CDT	Tornado Watch	SPC	Allamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 14 more	8 hr
May 23, 5:10 PM CDT	Mesoscale Discussion	SPC	Clinton, Dubuque, Jackson, Scott	95 min
May 23, 1:21 AM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Audrain, Boone, Buchanan, Caldwell and 35 more	24 min
May 23, 1:40 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Buchanan, Caldwell, Clark, Clinton, Daviess and 11 more	4 hr
May 23, 4:35 PM CDT	Severe Thunderstorm Watch	SPC	Barry, Camden, Christian, Crawford, Dade, Dallas and 24 more	5 hr
May 23, 5:00 PM CDT	Mesoscale Discussion	SPC	Callaway, Cole, Crawford, Franklin, Gasconade, Jefferson and 15 more	2 hr
May 23, 5:30 PM CDT	Tornado Watch	SPC	Jefferson, Saint Charles, Saint Louis, City of Saint Louis	6 hr
May 23, 6:50 PM CDT	Mesoscale Discussion	SPC	Dawes, Sioux	85 min

Nearby

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