Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 411

April 2, 200792 counties in Iowa; 7 counties in Missouri; Douglas County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2007, 8:05 PM CDT for 92 counties in Iowa; 7 counties in Missouri; Douglas County, Nebraska. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Apr 2, 2007, 8:05 PM CDT (01:05 UTC)
Expired
Apr 2, 2007, 10:00 PM CDT
In force
115 min
Issued by
the Storm Prediction Center
All 100 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clarke County, IA, Clay County, IA, Clayton County, IA, Clinton County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dickinson County, IA, Dubuque County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Henry County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Kossuth County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Mitchell County, IA, Monona County, IA, Monroe County, IA, Montgomery County, IA, Muscatine County, IA, O'Brien County, IA, Page County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Scott County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Atchison County, MO, Harrison County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Worth County, MO, Douglas County, NE

The radar

The Des Moines radar (KDMX), 30 km from the middle of the area, began a volume at 01:04 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, 1.1 hours before the alert went out and 222 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 2007-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 74 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, Omaha, NE at 00:00Z on 2007-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 square meters per square second.193958Sfc1 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
74 J/kg
Mixed-layer CIN
-377 J/kg
Mixed-layer LCL
1481 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
516 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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
Apr 2, 9:22 PM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 46 more8 hr
Apr 2, 11:33 PM CDTMesoscale DiscussionSPCBlack Hawk, Bremer, Buchanan, Butler, Calhoun, Clayton and 17 more57 min
Apr 2, 11:40 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Cass, Clarke, Decatur and 11 more65 min
Apr 3, 12:03 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 24 more7 hr
Apr 3, 1:27 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 49 more93 min
Apr 3, 2:22 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 24 more53 min
Apr 3, 4:05 AM CDTMesoscale DiscussionSPCDes Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 3 more55 min
Apr 3, 4:19 AM CDTSevere Thunderstorm WatchSPCCedar, Des Moines, Henry, Iowa, Jefferson, Johnson and 7 more6 hr
Apr 3, 4:28 AM CDTMesoscale DiscussionSPCCarroll, Cass, Chariton, Clay, Cole, Cooper and 12 more62 min
Apr 3, 7:17 AM CDTMesoscale DiscussionSPCAudrain, Bates, Benton, Boone, Callaway, Camden and 30 more88 min
Apr 3, 7:37 AM CDTSevere Thunderstorm WatchSPCAudrain, Bates, Benton, Boone, Callaway, Camden and 30 more8 hr
Apr 3, 9:08 AM CDTMesoscale DiscussionSPCSaint Louis, City of Saint Louis67 min
Apr 3, 9:46 AM CDTMesoscale DiscussionSPCAudrain, Bates, Benton, Boone, Callaway, Camden and 37 more29 min
Apr 3, 11:04 AM CDTMesoscale DiscussionSPCBarry, Barton, Benton, Bollinger, Boone, Butler and 62 more26 min
Apr 3, 11:51 AM CDTTornado WatchSPCBarry, Barton, Bollinger, Butler, Camden, Cape Girardeau and 50 more8 hr
Apr 3, 2:17 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot118 min
Apr 3, 2:25 PM CDTMesoscale DiscussionSPCBarry, Bollinger, Butler, Cape Girardeau, Carter, Christian and 39 more65 min
Apr 3, 3:12 PM CDTTornado WatchSPCDunklin, Pemiscot7 hr
Apr 2, 7:52 PM CDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Butler, Cass, Clay and 38 more83 min
Apr 2, 8:25 PM CDTSevere Thunderstorm WatchSPCAdams, Antelope, Boone, Buffalo, Burt, Butler and 32 more6 hr
Apr 2, 10:06 PM CDTMesoscale DiscussionSPCBoone, Butler, Cass, Colfax, Dodge, Douglas and 12 more54 min

Nearby

Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Missouri, 2007Mesoscale Discussions in Nebraska, 2007Every mesoscale discussion in 2007

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.