Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1708

July 23, 201112 counties in Iowa; 46 counties in Minnesota; 4 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2011, 1:52 PM CDT for 12 counties in Iowa; 46 counties in Minnesota; 4 counties in South Dakota. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Jul 23, 2011, 1:52 PM CDT (18:52 UTC)
Expired
Jul 23, 2011, 3:15 PM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 62 counties

Clay County, IA, Dickinson County, IA, Emmet County, IA, Hancock County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Sioux County, IA, Winnebago County, IA, Worth County, IA, Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Pope County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Swift County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Brookings County, SD, Deuel County, SD, Minnehaha County, SD, Moody County, SD

The radar

The Minneapolis radar (KMPX), 128 km from the middle of the area, began a volume at 18:53 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.9 hours before the alert went out and 126 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 2011-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1467 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, Minneapolis, MN at 12:00Z on 2011-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
1467 J/kg
Mixed-layer CIN
-142 J/kg
Mixed-layer LCL
875 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
175 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.2

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
Jul 22, 7:38 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Bremer, Buchanan, Butler, Cedar and 19 more97 min
Jul 23, 10:14 AM CDTSevere Thunderstorm WatchSPCAllamakee, Howard, Winneshiek4 hr
Jul 23, 1:10 PM CDTMesoscale DiscussionSPCAllamakee, Winneshiek65 min
Jul 23, 4:57 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Cass, Clarke, Dallas and 26 more93 min
Jul 23, 5:16 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Cass, Clarke, Davis and 25 more4 hr
Jul 22, 10:11 PM CDTMesoscale DiscussionSPCBecker, Clay, Grant, Norman, Otter Tail, Wilkin64 min
Jul 22, 10:15 PM CDTSevere Thunderstorm WatchSPCBecker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 6 more7 hr
Jul 23, 1:25 AM CDTMesoscale DiscussionSPCBecker, Big Stone, Clay, Clearwater, Douglas, Grant and 13 more35 min
Jul 23, 1:41 AM CDTSevere Thunderstorm WatchSPCBecker, Benton, Big Stone, Chippewa, Douglas, Grant and 20 more5 hr
Jul 23, 4:38 AM CDTMesoscale DiscussionSPCAitkin, Anoka, Becker, Benton, Big Stone, Carver and 36 more67 min
Jul 23, 9:37 AM CDTMesoscale DiscussionSPCFillmore, Houston, Olmsted, Wabasha, Winona53 min
Jul 22, 8:56 PM CDTMesoscale DiscussionSPCCampbell, Corson, Dewey, Edmunds, Harding, McPherson and 3 more94 min

Nearby

Mesoscale Discussions in Minnesota, 2011Mesoscale Discussions in Iowa, 2011Mesoscale Discussions in South Dakota, 2011Every mesoscale discussion in 2011

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.