Alert archive / Minnesota / Mesoscale Discussions in 2011
Mesoscale Discussion 1671
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2011, 6:55 PM CDT for 4 counties in Michigan; 8 counties in Minnesota; Ashland County, Bayfield County, Douglas County, Wisconsin. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2011, 6:55 PM CDT (23:55 UTC)
- Expired
- Jul 20, 2011, 8:30 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
Counties Gogebic County, MI, Houghton County, MI, Keweenaw County, MI, Ontonagon County, MI, Aitkin County, MN, Carlton County, MN, Cass County, MN, Cook County, MN, Itasca County, MN, Koochiching County, MN, Lake County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Douglas County, WI
The radar
The Duluth radar (KDLH), 72 km from the middle of the area, began a volume at 23:55 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
International Fa, MN (KINL), launched 12:00Z, 11.9 hours before the alert went out and 165 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.
- Mixed-layer CAPE
- 3428 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 477 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.5
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:02 AM CDT | Mesoscale Discussion | SPC | Clay, Clearwater, Kittson, Mahnomen, Marshall, Norman and 4 more | 88 min |
| Jul 20, 5:25 AM CDT | Severe Thunderstorm Watch | SPC | Beltrami, Clearwater, Kittson, Lake of the Woods, Mahnomen, Marshall and 5 more | 6 hr |
| Jul 20, 10:43 AM CDT | Mesoscale Discussion | SPC | Beltrami, Clearwater, Kittson, Marshall, Pennington, Polk and 2 more | 62 min |
| Jul 19, 7:38 PM CDT | Mesoscale Discussion | SPC | Adams, Barron, Chippewa, Clark, Dunn, Eau Claire and 5 more | 67 min |
| Jul 19, 10:16 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calumet, Clark, Dodge, Fond du Lac and 23 more | 119 min |
| Jul 19, 11:27 PM CDT | Severe Thunderstorm Watch | SPC | Columbia, Dane, Dodge, Fond du Lac, Green Lake, Jefferson and 11 more | 2 hr |
Nearby
Mesoscale Discussions in Minnesota, 2011Mesoscale Discussions in Michigan, 2011Mesoscale Discussions in Wisconsin, 2011Every 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.