Alert archive / Iowa / Mesoscale Discussions in 2011

Mesoscale Discussion 1568

July 10, 201114 counties in Iowa; 10 counties in Minnesota; 13 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2011, 11:45 PM CDT for 14 counties in Iowa; 10 counties in Minnesota; 13 counties in Wisconsin. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Jul 10, 2011, 11:45 PM CDT (04:45 UTC)
Expired
Jul 11, 2011, 1:15 AM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 37 counties

Allamakee County, IA, Bremer County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Fayette County, IA, Floyd County, IA, Hancock County, IA, Howard County, IA, Mitchell County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Dodge County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Chippewa County, WI, Crawford County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 58 km from the middle of the area, began a volume at 04:45 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 00:00Z, 4.8 hours before the alert went out and 180 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 00:00Z on 2011-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1401 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 00:00Z on 2011-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
1401 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1316 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
15 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
Jul 10, 7:51 PM CDTMesoscale DiscussionSPCAllamakee, Howard, Mitchell, Winneshiek84 min
Jul 10, 9:53 PM CDTMesoscale DiscussionSPCAllamakee, Cerro Gordo, Chickasaw, Dickinson, Emmet, Floyd and 9 more67 min
Jul 10, 10:10 PM CDTSevere Thunderstorm WatchSPCAllamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 13 more6 hr
Jul 10, 10:27 PM CDTMesoscale DiscussionSPCCherokee, Harrison, Monona, Plymouth, Sioux, Woodbury63 min
Jul 10, 10:57 PM CDTSevere Thunderstorm WatchSPCHarrison, Mills, Monona, Montgomery, Pottawattamie, Shelby4 hr
Jul 10, 11:56 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more4 hr
Jul 11, 1:08 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Black Hawk, Boone, Bremer and 38 more13 min
Jul 11, 1:21 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Black Hawk, Boone, Bremer and 38 more4 hr
Jul 11, 2:36 AM CDTMesoscale DiscussionSPCAdair, Adams, Benton, Black Hawk, Boone, Bremer and 52 more114 min
Jul 11, 3:30 AM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Buchanan, Cedar, Chickasaw, Clayton and 18 more6 hr
Jul 11, 5:07 AM CDTMesoscale DiscussionSPCBenton, Black Hawk, Buchanan, Cedar, Clayton, Clinton and 15 more113 min
Jul 11, 2:07 AM CDTMesoscale DiscussionSPCAdams, Brown, Calumet, Clark, Columbia, Dodge and 27 more83 min
Jul 11, 7:10 AM CDTMesoscale DiscussionSPCDane, Green, Jefferson, Kenosha, Milwaukee, Racine and 3 more95 min
Jul 11, 7:50 AM CDTMesoscale DiscussionSPCKenosha55 min

Nearby

Mesoscale Discussions in Iowa, 2011Mesoscale Discussions in Wisconsin, 2011Mesoscale Discussions in Minnesota, 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.