Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1997

September 21, 2007Menominee County, Michigan; 33 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 21, 2007, 10:24 AM CDT for Menominee County, Michigan; 33 counties in Wisconsin. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Sep 21, 2007, 10:24 AM CDT (15:24 UTC)
Expired
Sep 21, 2007, 11:30 AM CDT
In force
66 min
Issued by
the Storm Prediction Center
All 34 counties

Menominee County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Clark County, WI, Columbia County, WI, Dodge County, WI, Florence County, WI, Fond du Lac County, WI, Forest County, WI, Green Lake County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Richland County, WI, Sauk County, WI, Shawano County, WI, Taylor County, WI, Vernon County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 128 km from the middle of the area, began a volume at 15:24 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 12:00Z, 3.4 hours before the alert went out and 129 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, 6:04 AM CDTSevere Thunderstorm WatchSPCGogebic, Keweenaw, Ontonagon5 hr
Sep 21, 1:34 PM CDTMesoscale DiscussionSPCBaraga, Gogebic, Houghton, Iron, Ontonagon116 min
Sep 21, 2:46 PM CDTTornado WatchSPCBaraga, Dickinson, Gogebic, Houghton, Iron, Keweenaw and 3 more8 hr
Sep 21, 6:49 PM CDTMesoscale DiscussionSPCAlger, Delta, Leelanau, Luce, Mackinac, Menominee and 1 more86 min
Sep 20, 11:09 PM CDTMesoscale DiscussionSPCBarron, Burnett, Chippewa, Clark, Dunn, Eau Claire and 9 more81 min
Sep 20, 11:13 PM CDTSevere Thunderstorm WatchSPCAshland, Bayfield, Burnett, Douglas, Iron, Price and 2 more7 hr
Sep 21, 3:08 AM CDTMesoscale DiscussionSPCAshland, Bayfield, Burnett, Douglas, Iron, Price and 2 more2 hr
Sep 21, 3:17 PM CDTMesoscale DiscussionSPCCrawford, Grant, Vernon88 min
Sep 21, 3:53 PM CDTSevere Thunderstorm WatchSPCColumbia, Crawford, Grant, Green Lake, Iowa, Lafayette and 4 more4 hr
Sep 21, 6:17 PM CDTMesoscale DiscussionSPCColumbia, Dane, Dodge, Grant, Green, Iowa and 7 more88 min

Nearby

Mesoscale Discussions in Wisconsin, 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.