Alert archive / Minnesota / Mesoscale Discussions in 2024

Mesoscale Discussion 2011

August 27, 202421 counties in Iowa; 32 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2024, 3:46 AM CDT for 21 counties in Iowa; 32 counties in Minnesota. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Aug 27, 2024, 3:46 AM CDT (08:46 UTC)
Expired: Aug 27, 2024, 4:45 AM CDT
In force: 59 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

All 53 counties

Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Humboldt County, IA, Kossuth County, IA, Mitchell County, IA, Palo Alto County, IA, Pocahontas County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Jackson County, MN, Kandiyohi County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 132 km from the middle of the area, began a volume at 08:47 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, 8.8 hours before the alert went out and 132 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: 4426 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.4

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 26, 9:28 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Dickinson, Emmet, Lyon and 6 more	92 min
Aug 26, 10:55 PM CDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay, Dickinson, Lyon, O'Brien, Osceola and 2 more	6 hr
Aug 27, 12:41 AM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	94 min
Aug 27, 4:47 PM CDT	Mesoscale Discussion	SPC	Des Moines	88 min
Aug 26, 8:41 PM CDT	Severe Thunderstorm Watch	SPC	Wabasha	7 hr
Aug 27, 5:57 AM CDT	Mesoscale Discussion	SPC	Dakota, Ramsey, Washington	93 min

Nearby

Mesoscale Discussions in Minnesota, 2024 Mesoscale Discussions in Iowa, 2024 Every mesoscale discussion in 2024

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.