Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1829

August 2, 201110 counties in Illinois; 38 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2011, 6:19 AM CDT for 10 counties in Illinois; 38 counties in Wisconsin. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Aug 2, 2011, 6:19 AM CDT (11:19 UTC)
Expired
Aug 2, 2011, 7:45 AM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 48 counties

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL, Adams County, WI, Brown County, WI, Calumet County, WI, Chippewa County, WI, Clark County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green Lake County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Milwaukee County, WI, Oconto County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Price County, WI, Racine County, WI, Rock County, WI, Rusk County, WI, Shawano County, WI, Sheboygan County, WI, Taylor County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 101 km from the middle of the area, began a volume at 11:21 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 11.3 hours before the alert went out and 101 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 00:00Z on 2011-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1237 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 00:00Z on 2011-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
1237 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
1183 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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 2, 12:57 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more93 min
Aug 2, 5:22 PM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more9 hr
Aug 1, 9:40 PM CDTMesoscale DiscussionSPCBurnett, Douglas, Polk, Washburn95 min
Aug 1, 10:35 PM CDTSevere Thunderstorm WatchSPCBurnett, Douglas, Washburn7 hr
Aug 2, 1:24 AM CDTMesoscale DiscussionSPCBarron, Burnett, Chippewa, Clark, Douglas, Dunn and 13 more96 min
Aug 2, 2:20 AM CDTSevere Thunderstorm WatchSPCAshland, Barron, Bayfield, Burnett, Chippewa, Clark and 24 more10 hr
Aug 2, 3:32 AM CDTMesoscale DiscussionSPCBarron, Burnett, Chippewa, Clark, Douglas, Dunn and 13 more88 min
Aug 2, 5:23 AM CDTSevere Thunderstorm WatchSPCAshland, Barron, Bayfield, Burnett, Chippewa, Douglas and 11 more7 hr
Aug 2, 9:02 AM CDTMesoscale DiscussionSPCBarron, Chippewa, Dunn, Eau Claire, Pepin, Pierce and 4 more58 min
Aug 2, 11:51 AM CDTMesoscale DiscussionSPCAshland, Barron, Bayfield, Burnett, Chippewa, Douglas and 11 more24 min

Nearby

Mesoscale Discussions in Wisconsin, 2011Mesoscale Discussions in Illinois, 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.