Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 537

April 22, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2007, 12:07 PM CDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2007, 12:07 PM CDT (17:07 UTC)
Expired
Apr 22, 2007, 2:00 PM CDT
In force
113 min
Issued by
the Storm Prediction Center
All 77 counties

Adair County, IA, Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clarke County, IA, Clayton County, IA, Clinton County, IA, Dallas County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Kossuth County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Jo Daviess County, IL, Rock Island County, IL, Blue Earth County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Martin County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Waseca County, MN, Winona County, MN, Crawford County, WI, Grant County, WI

The radar

The Des Moines radar (KDMX), 107 km from the middle of the area, began a volume at 17:10 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, 5.1 hours before the alert went out and 317 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, 1:17 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, Fulton, Hancock, Henderson and 11 more8 hr
Apr 22, 10:57 AM CDTMesoscale DiscussionSPCFremont, Mills, Page93 min
Apr 22, 1:25 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Buena Vista, Calhoun, Carroll and 26 more95 min
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 21, 9:31 PM CDTSevere Thunderstorm WatchSPCBig Stone, Chippewa, Douglas, Kandiyohi, Lac qui Parle, Meeker and 9 more4 hr
Apr 21, 11:26 PM CDTMesoscale DiscussionSPCAitkin, Cass, Crow Wing, Itasca, Mille Lacs, Saint Louis2 hr

Nearby

Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Minnesota, 2007Mesoscale Discussions in Illinois, 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.