Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 169

March 23, 201811 counties in Iowa; 24 counties in Minnesota; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2018, 8:02 PM CDT for 11 counties in Iowa; 24 counties in Minnesota; 6 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Mar 23, 2018, 8:02 PM CDT (01:02 UTC)
Expired: Mar 24, 2018, 2:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 41 counties

Butler County, IA, Cerro Gordo County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Kossuth County, IA, Mitchell County, IA, Winnebago County, IA, Worth County, IA, Big Stone County, MN, Blue Earth County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Sibley County, MN, Swift County, MN, Waseca County, MN, Watonwan County, MN, Yellow Medicine County, MN, Brookings County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Moody County, SD

The radar

The Minneapolis radar (KMPX), 140 km from the middle of the area, began a volume at 01:01 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

Omaha, NE (KOAX), launched 00:00Z, 1.0 hours before the alert went out and 329 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1026 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 754 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Minnesota, 2018 Mesoscale Discussions in Iowa, 2018 Mesoscale Discussions in South Dakota, 2018 Every mesoscale discussion in 2018

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.