Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 1241

June 21, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2007, 3:25 PM CDT for 4 states. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued
Jun 21, 2007, 3:25 PM CDT (20:25 UTC)
Expired
Jun 21, 2007, 4:00 PM CDT
In force
35 min
Issued by
the Storm Prediction Center
All 96 counties

Adair County, IA, Allamakee County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Crawford County, IA, Dallas County, IA, Delaware County, IA, Dubuque County, IA, Emmet 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, Harrison County, IA, Howard County, IA, Humboldt County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Kossuth County, IA, Linn County, IA, Marshall County, IA, Mitchell County, IA, Muscatine County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Scott County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Jo Daviess County, IL, Blue Earth County, MN, Brown County, MN, Carver County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN, Buffalo County, WI, Crawford County, WI, Grant County, WI, Iowa County, WI, Jackson County, WI, La Crosse County, WI, Lafayette County, WI, Monroe County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The Des Moines radar (KDMX), 142 km from the middle of the area, began a volume at 20:25 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

Minneapolis, MN (KMPX), launched 12:00Z, 8.4 hours before the alert went out and 210 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, Minneapolis, MN at 12:00Z on 2007-06-21Temperature 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, Minneapolis, MN at 12:00Z on 2007-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -101 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
2261 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
-101 m²/s²
0-3 km storm-relative helicity
64 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
Jun 21, 9:57 AM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Champaign, Cook, DeKalb and 42 more33 min
Jun 21, 12:27 PM CDTMesoscale DiscussionSPCBoone, Carroll, DeKalb, Jo Daviess, Kane, McHenry and 3 more63 min
Jun 21, 3:55 PM CDTSevere Thunderstorm WatchSPCHenderson, Mercer, Rock Island, Warren3 hr
Jun 21, 5:42 PM CDTMesoscale DiscussionSPCBureau, Carroll, Fulton, Henderson, Henry, Jo Daviess and 15 more93 min
Jun 21, 6:47 PM CDTSevere Thunderstorm WatchSPCCarroll, Hancock, Henderson, Henry, Jo Daviess, Knox and 6 more4 hr
Jun 20, 11:30 PM CDTMesoscale DiscussionSPCHoward, Mitchell, Winnebago, Worth90 min
Jun 21, 4:27 AM CDTSevere Thunderstorm WatchSPCAllamakee, Howard, Mitchell, Winneshiek8 hr
Jun 21, 9:10 AM CDTMesoscale DiscussionSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux35 min
Jun 21, 9:38 AM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more6 hr
Jun 21, 11:55 AM CDTMesoscale DiscussionSPCAllamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 16 more50 min
Jun 21, 11:59 AM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 36 more8 hr
Jun 21, 2:13 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 50 more62 min
Jun 21, 3:15 PM CDTMesoscale DiscussionSPCCherokee, Clay, Dickinson, Ida, Lyon, O'Brien and 4 more30 min
Jun 20, 8:28 PM CDTMesoscale DiscussionSPCBlue Earth, Dodge, Goodhue, Le Sueur, Olmsted, Rice and 2 more92 min
Jun 21, 2:10 AM CDTMesoscale DiscussionSPCBig Stone, Lac qui Parle, Stevens, Traverse, Yellow Medicine95 min
Jun 21, 2:29 AM CDTSevere Thunderstorm WatchSPCBig Stone, Traverse, Wilkin8 hr
Jun 21, 3:55 AM CDTMesoscale DiscussionSPCBig Stone, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 32 more95 min
Jun 21, 7:14 AM CDTMesoscale DiscussionSPCBlue Earth, Brown, Chippewa, Cottonwood, Faribault, Jackson and 11 more91 min
Jun 21, 11:08 AM CDTMesoscale DiscussionSPCAnoka, Benton, Brown, Carver, Chippewa, Dakota and 25 more67 min
Jun 20, 7:25 PM CDTMesoscale DiscussionSPCAdams, Barron, Buffalo, Chippewa, Clark, Dunn and 18 more95 min

Nearby

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