Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1912

August 28, 20076 counties in Minnesota; 30 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2007, 11:58 AM CDT for 6 counties in Minnesota; 30 counties in Wisconsin. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Aug 28, 2007, 11:58 AM CDT (16:58 UTC)
Expired
Aug 28, 2007, 1:00 PM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 36 counties

Dodge County, MN, Goodhue County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Jackson County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Menominee 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, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vilas County, WI, Waupaca County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 136 km from the middle of the area, began a volume at 16:58 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.0 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, Green Bay/Straub, WI at 12:00Z on 2007-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 386 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, Green Bay/Straub, WI at 12:00Z on 2007-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 274 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
386 J/kg
Mixed-layer CIN
-330 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
274 m²/s²
0-3 km storm-relative helicity
291 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
Aug 27, 9:05 PM CDTMesoscale DiscussionSPCAitkin, Carlton, Crow Wing, Lake, Morrison, Pine55 min
Aug 27, 9:49 PM CDTMesoscale DiscussionSPCLincoln, Yellow Medicine86 min
Aug 28, 1:50 AM CDTMesoscale DiscussionSPCAnoka, Carver, Chisago, Hennepin, Isanti, McLeod and 5 more55 min
Aug 28, 1:56 AM CDTSevere Thunderstorm WatchSPCAnoka, Brown, Carver, Chisago, Dakota, Goodhue and 10 more3 hr
Aug 28, 12:15 PM CDTSevere Thunderstorm WatchSPCBlue Earth, Brown, Carver, Dakota, Dodge, Faribault and 20 more8 hr
Aug 28, 3:24 PM CDTMesoscale DiscussionSPCBlue Earth, Dodge, Faribault, Fillmore, Freeborn, Goodhue and 10 more66 min
Aug 28, 3:48 AM CDTMesoscale DiscussionSPCChippewa, Clark, Dunn, Eau Claire, Forest, Langlade and 8 more87 min
Aug 28, 4:17 AM CDTSevere Thunderstorm WatchSPCClark, Door, Florence, Forest, Langlade, Lincoln and 7 more4 hr
Aug 28, 6:04 PM CDTMesoscale DiscussionSPCCrawford, Richland, Vernon3 hr
Aug 28, 6:28 PM CDTMesoscale DiscussionSPCAdams, Brown, Calumet, Columbia, Crawford, Fond du Lac and 9 more62 min

Nearby

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