Alert archive / Minnesota / Mesoscale Discussions in 2007

Mesoscale Discussion 1234

June 21, 200722 counties in Iowa; 25 counties in Minnesota; 13 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2007, 11:55 AM CDT for 22 counties in Iowa; 25 counties in Minnesota; 13 counties in Wisconsin. It was in force for 50 min.

The area

The outline as issued.

The facts

Issued
Jun 21, 2007, 11:55 AM CDT (16:55 UTC)
Expired
Jun 21, 2007, 12:45 PM CDT
In force
50 min
Issued by
the Storm Prediction Center
All 60 counties

Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Kossuth County, IA, Mitchell County, IA, Palo Alto County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Blue Earth County, MN, Carver County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Houston County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mower County, MN, Nicollet County, MN, Olmsted 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, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 135 km from the middle of the area, began a volume at 16:56 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, 4.9 hours before the alert went out and 149 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 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, 9:57 AM CDTMesoscale DiscussionSPCAllamakee, Cedar, Clayton, Clinton, Delaware, Des Moines and 10 more33 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 21, 3:25 PM CDTMesoscale DiscussionSPCAdair, Allamakee, Audubon, Benton, Black Hawk, Boone and 52 more35 min
Jun 21, 3:55 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Cass, Cedar, Clarke and 26 more3 hr
Jun 21, 5:42 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Cedar and 25 more93 min
Jun 21, 6:47 PM CDTSevere Thunderstorm WatchSPCAppanoose, Cedar, Clayton, Clinton, Davis, Delaware and 18 more4 hr
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
Jun 21, 12:27 PM CDTMesoscale DiscussionSPCColumbia, Dane, Dodge, Green, Iowa, Jefferson and 4 more63 min

Nearby

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