Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 2092

September 1, 201114 counties in Minnesota; Burnett County, Douglas County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 1, 2011, 8:57 PM CDT for 14 counties in Minnesota; Burnett County, Douglas County, Wisconsin. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Sep 1, 2011, 8:57 PM CDT (01:57 UTC)
Expired: Sep 1, 2011, 10:30 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

Counties Aitkin County, MN, Benton County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Isanti County, MN, Itasca County, MN, Kanabec County, MN, Lake County, MN, Mille Lacs County, MN, Morrison County, MN, Pine County, MN, Saint Louis County, MN, Todd County, MN, Burnett County, WI, Douglas County, WI

The radar

The Duluth radar (KDLH), 59 km from the middle of the area, began a volume at 01:59 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 00:00Z, 2.0 hours before the alert went out and 209 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: 2071 J/kg
Mixed-layer CIN: -349 J/kg
Mixed-layer LCL: 1469 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
Sep 2, 3:27 AM CDT	Mesoscale Discussion	SPC	Faribault, Fillmore, Freeborn, Mower	93 min
Sep 2, 3:48 AM CDT	Severe Thunderstorm Watch	SPC	Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more	6 hr
Sep 2, 7:29 AM CDT	Mesoscale Discussion	SPC	Adams, Calumet, Columbia, Dodge, Fond du Lac, Green Lake and 10 more	61 min
Sep 2, 7:50 AM CDT	Severe Thunderstorm Watch	SPC	Brown, Calumet, Columbia, Dodge, Door, Fond du Lac and 16 more	3 hr
Sep 2, 10:08 AM CDT	Mesoscale Discussion	SPC	Brown, Calumet, Door, Fond du Lac, Kewaunee, Manitowoc and 3 more	97 min
Sep 2, 2:41 PM CDT	Mesoscale Discussion	SPC	Crawford, Dane, Grant, Green, Iowa, Jefferson and 5 more	94 min

Nearby

Mesoscale Discussions in Minnesota, 2011 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.