Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 538

April 22, 200732 counties in Iowa; 18 counties in Missouri; Burt County, Washington County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2007, 1:25 PM CDT for 32 counties in Iowa; 18 counties in Missouri; Burt County, Washington County, Nebraska. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2007, 1:25 PM CDT (18:25 UTC)
Expired
Apr 22, 2007, 3:00 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 52 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Ida County, IA, Madison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Page County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Taylor County, IA, Union County, IA, Woodbury County, IA, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Ray County, MO, Worth County, MO, Burt County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 116 km from the middle of the area, began a volume at 18:27 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 12:00Z, 6.4 hours before the alert went out and 116 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 12:00Z on 2007-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2007-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -53 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1189 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
-53 m²/s²
0-3 km storm-relative helicity
-25 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
Apr 22, 10:57 AM CDTMesoscale DiscussionSPCFremont, Mills, Page93 min
Apr 22, 12:07 PM CDTMesoscale DiscussionSPCAdair, Allamakee, Benton, Black Hawk, Boone, Bremer and 55 more113 min
Apr 22, 1:17 PM CDTSevere Thunderstorm WatchSPCAllamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 52 more8 hr
Apr 22, 1:56 PM CDTTornado WatchSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 31 more7 hr
Apr 22, 5:59 PM CDTMesoscale DiscussionSPCBoone, Clarke, Dallas, Decatur, Dickinson, Humboldt and 6 more2 hr
Apr 22, 6:36 PM CDTMesoscale DiscussionSPCAppanoose, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 27 more114 min
Apr 22, 11:30 AM CDTTornado WatchSPCAtchison, Holt6 hr
Apr 22, 3:07 PM CDTMesoscale DiscussionSPCBarton, Bates, Cass, Clay, Jackson, Johnson and 4 more113 min
Apr 21, 10:34 PM CDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boyd, Brown, Cherry, Garfield and 8 more3 hr

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.