Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 1795

July 30, 2011Gogebic County, Iron County, Michigan; 30 counties in Minnesota; 21 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2011, 11:28 AM CDT for Gogebic County, Iron County, Michigan; 30 counties in Minnesota; 21 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 30, 2011, 11:28 AM CDT (16:28 UTC)
Expired: Jul 30, 2011, 2:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 53 counties

Gogebic County, MI, Iron County, MI, Anoka County, MN, Benton County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Dakota County, MN, Grant County, MN, Hennepin County, MN, Isanti County, MN, Kandiyohi County, MN, Lake County, MN, Le Sueur County, MN, McLeod County, MN, Meeker County, MN, Nicollet County, MN, Pine County, MN, Pope County, MN, Ramsey County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Washington County, MN, Wright County, MN, 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, Lincoln County, WI, Oneida County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Vilas County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 76 km from the middle of the area, began a volume at 16:28 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

Minneapolis, MN (KMPX), launched 12:00Z, 4.5 hours before the alert went out and 172 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: 2252 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.9

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.

Issued	Product	Office	Counties	Lasted
Jul 30, 1:04 PM CDT	Severe Thunderstorm Watch	SPC	Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 6 more	7 hr
Jul 30, 2:56 PM CDT	Mesoscale Discussion	SPC	Alger, Baraga, Benzie, Delta, Dickinson, Iron and 8 more	2 hr
Jul 30, 5:47 AM CDT	Mesoscale Discussion	SPC	Big Stone, Brown, Chippewa, Kandiyohi, Lac qui Parle, Lincoln and 9 more	88 min
Jul 30, 1:28 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Blue Earth, Brown, Carver, Chippewa, Chisago and 32 more	112 min
Jul 30, 3:22 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Big Stone, Blue Earth, Brown, Carver and 38 more	53 min
Jul 30, 5:31 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Benton, Big Stone, Brown, Carlton and 41 more	7 hr

Nearby

Mesoscale Discussions in Minnesota, 2011 Mesoscale Discussions in Wisconsin, 2011 Mesoscale Discussions in Michigan, 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.