Alert archive / Iowa / Mesoscale Discussions in 2019

Mesoscale Discussion 982

June 4, 201920 counties in Iowa; Houston County, Minnesota; 12 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2019, 7:40 PM CDT for 20 counties in Iowa; Houston County, Minnesota; 12 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 4, 2019, 7:40 PM CDT (00:40 UTC)
Expired: Jun 4, 2019, 9:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 33 counties

Allamakee County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Howard County, IA, Kossuth County, IA, Mitchell County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Houston County, MN, Adams County, WI, Crawford County, WI, Grant County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Monroe County, WI, Richland County, WI, Sauk County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 79 km from the middle of the area, began a volume at 00:43 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

Davenport, (KDVN), launched 00:00Z, 0.7 hours before the alert went out and 227 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: 632 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.4

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
Jun 5, 10:03 AM CDT	Mesoscale Discussion	SPC	Des Moines, Henry, Jefferson, Lee, Louisa, Van Buren	117 min

Nearby

Mesoscale Discussions in Iowa, 2019 Mesoscale Discussions in Wisconsin, 2019 Mesoscale Discussions in Minnesota, 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.