Alert archive / Minnesota / Mesoscale Discussions in 2005

Mesoscale Discussion 2161

September 8, 20057 counties in Iowa; 13 counties in Minnesota; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2005, 1:59 AM CDT for 7 counties in Iowa; 13 counties in Minnesota; 9 counties in South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Sep 8, 2005, 1:59 AM CDT (06:59 UTC)
Expired: Sep 8, 2005, 5:00 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 29 counties

Clay County, IA, Dickinson County, IA, Emmet County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Sioux County, IA, Brown County, MN, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Rock County, MN, Watonwan County, MN, Yellow Medicine County, MN, Brookings County, SD, Clark County, SD, Codington County, SD, Deuel County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Minnehaha County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 54 km from the middle of the area, began a volume at 06:58 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

Aberdeen, SD (KABR), launched 00:00Z, 7.0 hours before the alert went out and 203 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: 368 J/kg
Mixed-layer CIN: -203 J/kg
Mixed-layer LCL: 1201 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 8, 6:08 AM CDT	Mesoscale Discussion	SPC	Boone, Buena Vista, Calhoun, Cerro Gordo, Cherokee, Clay and 18 more	3 hr
Sep 8, 9:40 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Audubon, Boone, Buena Vista, Butler, Calhoun and 34 more	5 hr
Sep 8, 10:56 AM CDT	Mesoscale Discussion	SPC	Boone, Calhoun, Greene, Hamilton, Hardin, Humboldt and 6 more	64 min
Sep 8, 12:38 PM CDT	Mesoscale Discussion	SPC	Des Moines, Henry, Iowa, Jasper, Jefferson, Johnson and 13 more	97 min
Sep 8, 1:10 PM CDT	Severe Thunderstorm Watch	SPC	Appanoose, Benton, Cedar, Davis, Des Moines, Henry and 15 more	6 hr
Sep 8, 2:40 PM CDT	Mesoscale Discussion	SPC	Davis, Des Moines, Henry, Jefferson, Lee, Louisa and 5 more	95 min
Sep 7, 8:24 PM CDT	Mesoscale Discussion	SPC	Buffalo, Dewey, Haakon, Hughes, Hyde, Jackson and 6 more	2 hr
Sep 8, 1:59 PM CDT	Mesoscale Discussion	SPC	Bennett, Fall River, Oglala Lakota, Todd	2 hr

Nearby

Mesoscale Discussions in Minnesota, 2005 Mesoscale Discussions in South Dakota, 2005 Mesoscale Discussions in Iowa, 2005 Every mesoscale discussion in 2005

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.