Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 1091

May 29, 20084 states

The Storm Prediction Center issued this mesoscale discussion at May 29, 2008, 11:34 PM CDT for 4 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued
May 29, 2008, 11:34 PM CDT (04:34 UTC)
Expired
May 30, 2008, 12:30 AM CDT
In force
56 min
Issued by
the Storm Prediction Center
All 91 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Doniphan County, KS, Jackson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Linn County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Sullivan County, MO, Worth County, MO, Burt County, NE, Cass County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thurston County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 115 km from the middle of the area, began a volume at 04:34 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.6 hours before the alert went out and 115 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 2008-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3876 joules per kilogram.LCLEL10008507005003002001001 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 2008-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 236 square meters per square second.1939587897Sfc1 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
3876 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
824 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
236 m²/s²
0-3 km storm-relative helicity
285 m²/s²
Significant tornado parameter
6.4
Supercell composite
26.8

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 29, 7:37 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Calhoun and 25 more53 min
May 29, 8:13 PM CDTTornado WatchSPCAdair, Adams, Appanoose, Audubon, Boone, Calhoun and 29 more8 hr
May 29, 10:21 PM CDTMesoscale DiscussionSPCPlymouth, Sioux, Woodbury24 min
May 30, 1:19 AM CDTTornado WatchSPCAppanoose, Benton, Cedar, Clarke, Clinton, Davis and 25 more8 hr
May 30, 1:37 AM CDTMesoscale DiscussionSPCFremont, Harrison, Mills, Monona, Montgomery, Page and 2 more53 min
May 30, 2:17 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Boone and 49 more88 min
May 30, 6:00 AM CDTMesoscale DiscussionSPCAppanoose, Cedar, Clinton, Davis, Des Moines, Henry and 13 more2 hr
May 30, 7:56 AM CDTTornado WatchSPCDes Moines, Henry, Lee, Louisa, Muscatine, Van Buren6 hr
May 30, 4:29 PM CDTMesoscale DiscussionSPCDavis, Des Moines, Henry, Jefferson, Lee, Louisa and 3 more61 min
May 30, 4:58 PM CDTSevere Thunderstorm WatchSPCAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more3 hr
May 29, 9:19 PM CDTMesoscale DiscussionSPCFinney, Grant, Gray, Greeley, Hamilton, Haskell and 12 more56 min
May 29, 9:38 PM CDTMesoscale DiscussionSPCCloud, Decatur, Ellis, Ellsworth, Gove, Graham and 14 more37 min
May 29, 9:46 PM CDTSevere Thunderstorm WatchSPCEllis, Finney, Gove, Graham, Grant, Greeley and 12 more5 hr
May 29, 10:02 PM CDTTornado WatchSPCCloud, Jewell, Mitchell, Osborne, Phillips, Republic and 2 more4 hr
May 30, 2:25 AM CDTMesoscale DiscussionSPCFinney, Grant, Gray, Haskell, Hodgeman, Kearny and 4 more65 min
May 30, 2:23 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Butler, Chautauqua, Coffey and 16 more97 min
May 30, 2:42 PM CDTTornado WatchSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 15 more7 hr
May 30, 1:14 PM CDTMesoscale DiscussionSPCLincoln, Pike, Saint Charles, Saint Louis, City of Saint Louis2 hr
May 30, 1:56 PM CDTTornado WatchSPCAudrain, Boone, Callaway, Cole, Franklin, Gasconade and 16 more8 hr
May 30, 5:18 PM CDTMesoscale DiscussionSPCAudrain, Boone, Callaway, Carroll, Chariton, Cole and 24 more87 min

Nearby

Mesoscale Discussions in Iowa, 2008Mesoscale Discussions in Nebraska, 2008Mesoscale Discussions in Missouri, 2008Every mesoscale discussion in 2008

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.