Alert archive / Wisconsin / Mesoscale Discussions in 2012

Mesoscale Discussion 1234

June 20, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2012, 2:10 PM CDT for 4 states. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Jun 20, 2012, 2:10 PM CDT (19:10 UTC)
Expired
Jun 20, 2012, 3:45 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 76 counties

Buena Vista County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mitchell County, IA, Palo Alto County, IA, Pocahontas County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Baraga County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Keweenaw County, MI, Marquette County, MI, Ontonagon County, MI, Blue Earth County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Martin County, MN, Mower County, MN, Olmsted County, MN, Rice County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Winona County, MN, Ashland County, WI, Barron County, WI, Bayfield County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Jackson County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Monroe County, WI, Oneida County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vilas County, WI, Washburn County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 97 km from the middle of the area, began a volume at 19:12 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, 7.2 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 2012-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 737 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 2012-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 272 square meters per square second.193958Sfc1 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
737 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
974 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
272 m²/s²
0-3 km storm-relative helicity
358 m²/s²
Significant tornado parameter
0.7
Supercell composite
15.1

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 19, 7:01 PM CDTSevere Thunderstorm WatchSPCLyon, Osceola, Plymouth, Sioux7 hr
Jun 20, 3:24 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 19 more96 min
Jun 19, 9:12 PM CDTMesoscale DiscussionSPCAnoka, Benton, Big Stone, Chippewa, Chisago, Douglas and 22 more93 min
Jun 19, 9:17 PM CDTMesoscale DiscussionSPCAitkin, Becker, Cass, Clay, Crow Wing, Hubbard and 7 more88 min
Jun 19, 11:20 PM CDTSevere Thunderstorm WatchSPCBig Stone, Traverse5 hr
Jun 19, 11:37 PM CDTMesoscale DiscussionSPCAitkin, Benton, Big Stone, Carlton, Cass, Chippewa and 22 more83 min
Jun 20, 4:00 AM CDTMesoscale DiscussionSPCLac qui Parle60 min
Jun 20, 5:27 AM CDTMesoscale DiscussionSPCAitkin, Carlton, Crow Wing, Mille Lacs, Morrison2 hr
Jun 20, 9:40 AM CDTMesoscale DiscussionSPCAnoka, Benton, Chisago, Isanti, Kanabec, Mille Lacs and 3 more95 min

Nearby

Mesoscale Discussions in Wisconsin, 2012Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in Minnesota, 2012Every mesoscale discussion in 2012

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.