Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1832

August 2, 201117 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2011, 11:51 AM CDT for 17 counties in Wisconsin. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued: Aug 2, 2011, 11:51 AM CDT (16:51 UTC)
Expired: Aug 2, 2011, 12:15 PM CDT
In force: 24 min
Issued by: the Storm Prediction Center

Counties Ashland County, WI, Barron County, WI, Bayfield County, WI, Burnett County, WI, Chippewa County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Iron County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 146 km from the middle of the area, began a volume at 16:51 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

Minneapolis, MN (KMPX), launched 12:00Z, 4.9 hours before the alert went out and 194 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2133 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 850 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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.

Issued	Product	Office	Counties	Lasted
Aug 1, 9:40 PM CDT	Mesoscale Discussion	SPC	Burnett, Douglas, Polk, Washburn	95 min
Aug 1, 10:35 PM CDT	Severe Thunderstorm Watch	SPC	Burnett, Douglas, Washburn	7 hr
Aug 2, 1:24 AM CDT	Mesoscale Discussion	SPC	Barron, Burnett, Chippewa, Clark, Douglas, Dunn and 13 more	96 min
Aug 2, 2:20 AM CDT	Severe Thunderstorm Watch	SPC	Ashland, Barron, Bayfield, Burnett, Chippewa, Clark and 24 more	10 hr
Aug 2, 3:32 AM CDT	Mesoscale Discussion	SPC	Barron, Burnett, Chippewa, Clark, Douglas, Dunn and 13 more	88 min
Aug 2, 5:23 AM CDT	Severe Thunderstorm Watch	SPC	Ashland, Barron, Bayfield, Burnett, Chippewa, Douglas and 11 more	7 hr
Aug 2, 6:19 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Chippewa, Clark, Columbia and 32 more	86 min
Aug 2, 9:02 AM CDT	Mesoscale Discussion	SPC	Barron, Chippewa, Dunn, Eau Claire, Pepin, Pierce and 4 more	58 min
Aug 2, 12:57 PM CDT	Mesoscale Discussion	SPC	Adams, Calumet, Columbia, Crawford, Dane, Dodge and 26 more	93 min
Aug 2, 5:22 PM CDT	Severe Thunderstorm Watch	SPC	Kenosha, Milwaukee, Racine, Rock, Walworth, Waukesha	9 hr

Nearby

Mesoscale Discussions in Wisconsin, 2011 Every 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.