Alert archive / Wisconsin / Mesoscale Discussions in 2014

Mesoscale Discussion 1677

September 4, 2014Menominee County, Michigan; 5 counties in Minnesota; 22 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 4, 2014, 7:21 AM CDT for Menominee County, Michigan; 5 counties in Minnesota; 22 counties in Wisconsin. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Sep 4, 2014, 7:21 AM CDT (12:21 UTC)
Expired
Sep 4, 2014, 9:15 AM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 28 counties

Menominee County, MI, Aitkin County, MN, Crow Wing County, MN, Kanabec County, MN, Mille Lacs County, MN, Pine County, MN, Barron County, WI, Brown County, WI, Burnett County, WI, Douglas County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Kewaunee County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Shawano County, WI, Taylor County, WI, Vilas County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 181 km from the middle of the area, began a volume at 12:20 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, 0.4 hours before the alert went out and 233 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 2014-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 503 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 2014-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 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
503 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
672 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
147 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
Sep 4, 7:42 AM CDTSevere Thunderstorm WatchSPCDickinson, Gogebic, Iron, Menominee4 hr
Sep 4, 10:25 AM CDTMesoscale DiscussionSPCIron, Menominee65 min
Sep 4, 12:49 PM CDTMesoscale DiscussionSPCAntrim, Benzie, Charlevoix, Cheboygan, Crawford, Emmet and 13 more56 min
Sep 3, 8:00 PM CDTMesoscale DiscussionSPCChisago90 min
Sep 3, 10:41 PM CDTMesoscale DiscussionSPCHouston, Winona79 min
Sep 4, 1:17 AM CDTMesoscale DiscussionSPCBecker, Clay, Douglas, Grant, Mahnomen, Norman and 4 more88 min
Sep 4, 1:48 AM CDTSevere Thunderstorm WatchSPCBecker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 4 more5 hr
Sep 4, 4:43 AM CDTMesoscale DiscussionSPCAitkin, Becker, Chisago, Clay, Crow Wing, Isanti and 8 more2 hr
Sep 4, 5:02 AM CDTSevere Thunderstorm WatchSPCAitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 7 more5 hr
Sep 4, 5:04 PM CDTMesoscale DiscussionSPCHouston, Winona86 min
Sep 3, 8:22 PM CDTSevere Thunderstorm WatchSPCBarron, Chippewa, Clark, Dunn, Eau Claire, Polk and 5 more3 hr

Nearby

Mesoscale Discussions in Wisconsin, 2014Mesoscale Discussions in Minnesota, 2014Mesoscale Discussions in Michigan, 2014Every mesoscale discussion in 2014

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.