Alert archive / Iowa / Mesoscale Discussions in 2019

Mesoscale Discussion 20

January 18, 201917 counties in Iowa; 12 counties in Minnesota; 10 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jan 18, 2019, 11:07 AM CST for 17 counties in Iowa; 12 counties in Minnesota; 10 counties in South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jan 18, 2019, 11:07 AM CST (17:07 UTC)
Expired: Jan 18, 2019, 2:00 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center

All 39 counties

Bremer County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Hancock County, IA, Howard County, IA, Kossuth County, IA, Lyon County, IA, Mitchell County, IA, Osceola County, IA, Palo Alto County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Blue Earth County, MN, Cottonwood County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Watonwan County, MN, Davison County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 111 km from the middle of the area, began a volume at 17:09 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 12:00Z, 5.1 hours before the alert went out and 208 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: 1227 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jan 18, 5:54 PM CST	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 35 more	6 hr

Nearby

Mesoscale Discussions in Iowa, 2019 Mesoscale Discussions in Minnesota, 2019 Mesoscale Discussions in South Dakota, 2019 Every mesoscale discussion in 2019

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.