Alert archive / Iowa / Mesoscale Discussions in 2017

Mesoscale Discussion 309

March 23, 201715 counties in Iowa; 9 counties in Minnesota; 12 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2017, 10:16 AM CDT for 15 counties in Iowa; 9 counties in Minnesota; 12 counties in South Dakota. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Mar 23, 2017, 10:16 AM CDT (15:16 UTC)
Expired: Mar 23, 2017, 11:45 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 36 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Faribault County, MN, Jackson County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Watonwan County, MN, Clay County, SD, Hanson County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 75 km from the middle of the area, began a volume at 15:18 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, 3.3 hours before the alert went out and 234 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: 1500 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 392 m²/s²
0-3 km storm-relative helicity: 500 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
Mar 23, 6:28 PM CDT	Mesoscale Discussion	SPC	Allamakee	92 min

Nearby

Mesoscale Discussions in Iowa, 2017 Mesoscale Discussions in South Dakota, 2017 Mesoscale Discussions in Minnesota, 2017 Every mesoscale discussion in 2017

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.