Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 399

April 10, 201112 counties in Michigan; 32 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2011, 7:02 PM EDT for 12 counties in Michigan; 32 counties in Wisconsin. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Apr 10, 2011, 7:02 PM EDT (23:02 UTC)
Expired
Apr 10, 2011, 8:30 PM EDT
In force
88 min
Issued by
the Storm Prediction Center
All 44 counties

Alger County, MI, Baraga County, MI, Delta County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Keweenaw County, MI, Marquette County, MI, Menominee County, MI, Ontonagon County, MI, Schoolcraft County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Door County, WI, Florence County, WI, Fond du Lac County, WI, Forest County, WI, Green Lake County, WI, Iowa County, WI, Juneau County, WI, Kewaunee County, WI, Langlade County, WI, Lincoln County, WI, Manitowoc County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Richland County, WI, Sauk County, WI, Shawano County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 87 km from the middle of the area, began a volume at 23:04 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, 11.0 hours before the alert went out and 90 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 2011-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 56 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 2011-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
56 J/kg
Mixed-layer CIN
-264 J/kg
Mixed-layer LCL
799 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
91 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
Apr 10, 4:19 PM EDTTornado Watch PDSSPCGogebic, Iron, Ontonagon7 hr
Apr 10, 5:51 PM EDTMesoscale DiscussionSPCAntrim, Arenac, Benzie, Crawford, Gladwin, Grand Traverse and 7 more84 min
Apr 10, 6:20 PM EDTTornado WatchSPCAlcona, Alpena, Antrim, Arenac, Benzie, Charlevoix and 17 more7 hr
Apr 9, 8:42 PM EDTSevere Thunderstorm WatchSPCBuffalo, Chippewa, Dunn, Eau Claire, La Crosse, Pepin and 3 more7 hr
Apr 10, 12:01 AM EDTTornado WatchSPCCrawford, La Crosse, Monroe, Richland, Vernon5 hr
Apr 10, 2:26 AM EDTMesoscale DiscussionSPCBuffalo, Crawford, Eau Claire, Jackson, La Crosse, Monroe and 4 more64 min
Apr 10, 2:30 PM EDTMesoscale DiscussionSPCAdams, Barron, Buffalo, Calumet, Chippewa, Clark and 44 more2 hr

Nearby

Mesoscale Discussions in Wisconsin, 2011Mesoscale Discussions in Michigan, 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.