Alert archive / Iowa / Mesoscale Discussions in 2008

Mesoscale Discussion 1087

May 29, 200831 counties in Iowa; 8 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at May 29, 2008, 7:37 PM CDT for 31 counties in Iowa; 8 counties in Missouri. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
May 29, 2008, 7:37 PM CDT (00:37 UTC)
Expired
May 29, 2008, 8:30 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 39 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Decatur County, IA, Greene County, IA, Guthrie County, IA, Ida County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Story County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Atchison County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 72 km from the middle of the area, began a volume at 00:37 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 00:00Z, 0.6 hours before the alert went out and 156 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, 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 29, 11:34 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Black Hawk, Boone and 38 more56 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 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, 2:23 PM CDTMesoscale DiscussionSPCBates, Caldwell, Carroll, Cass, Chariton, Clay and 15 more97 min
May 30, 2:42 PM CDTTornado WatchSPCAdair, Barton, Bates, Benton, Caldwell, Camden and 36 more7 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 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.