Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1999

September 21, 20075 counties in Michigan; 16 counties in Minnesota; 36 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 21, 2007, 2:34 PM EDT for 5 counties in Michigan; 16 counties in Minnesota; 36 counties in Wisconsin. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Sep 21, 2007, 2:34 PM EDT (18:34 UTC)
Expired
Sep 21, 2007, 4:30 PM EDT
In force
116 min
Issued by
the Storm Prediction Center
All 57 counties

Baraga County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Ontonagon County, MI, Chisago County, MN, Cook County, MN, Dakota County, MN, Dodge County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Lake County, MN, Mower County, MN, Olmsted County, MN, Ramsey County, MN, Steele County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Adams County, WI, Ashland County, WI, Barron County, WI, Bayfield County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Jackson County, WI, Juneau 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, Vernon County, WI, Vilas County, WI, Washburn County, WI, Wood County, WI

The radar

The Duluth radar (KDLH), 157 km from the middle of the area, began a volume at 18:34 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, 6.6 hours before the alert went out and 256 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 2007-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 149 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 2007-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 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
149 J/kg
Mixed-layer CIN
-209 J/kg
Mixed-layer LCL
1031 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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
Sep 21, 7:04 AM EDTSevere Thunderstorm WatchSPCGogebic, Keweenaw, Ontonagon5 hr
Sep 21, 11:24 AM EDTMesoscale DiscussionSPCMenominee66 min
Sep 21, 3:46 PM EDTTornado WatchSPCBaraga, Dickinson, Gogebic, Houghton, Iron, Keweenaw and 3 more8 hr
Sep 21, 7:49 PM EDTMesoscale DiscussionSPCAlger, Delta, Leelanau, Luce, Mackinac, Menominee and 1 more86 min
Sep 20, 9:40 PM EDTMesoscale DiscussionSPCMurray, Nobles, Pipestone, Rock95 min
Sep 21, 12:13 AM EDTSevere Thunderstorm WatchSPCAitkin, Carlton, Cass, Cook, Crow Wing, Itasca and 4 more7 hr
Sep 21, 1:00 AM EDTTornado WatchSPCBecker, Beltrami, Benton, Big Stone, Chippewa, Clay and 28 more6 hr
Sep 21, 4:08 AM EDTMesoscale DiscussionSPCAitkin, Carlton, Cook, Itasca, Koochiching, Lake and 2 more2 hr
Sep 21, 4:29 AM EDTMesoscale DiscussionSPCBecker, Beltrami, Benton, Big Stone, Chippewa, Clay and 27 more2 hr
Sep 21, 4:17 PM EDTMesoscale DiscussionSPCHouston88 min
Sep 21, 4:53 PM EDTSevere Thunderstorm WatchSPCHouston4 hr
Sep 21, 12:09 AM EDTMesoscale DiscussionSPCBarron, Burnett, Chippewa, Clark, Dunn, Eau Claire and 9 more81 min
Sep 21, 7:17 PM EDTMesoscale DiscussionSPCColumbia, Dane, Dodge, Grant, Green, Iowa and 7 more88 min

Nearby

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