Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 235

April 13, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2018, 8:44 AM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 13, 2018, 8:44 AM CDT (13:44 UTC)
Expired: Apr 13, 2018, 11:15 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 59 counties

Allamakee County, IA, Dickinson County, IA, Emmet County, IA, Howard County, IA, Lyon County, IA, Mitchell County, IA, Osceola County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Blue Earth County, MN, Brown County, MN, Cottonwood County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Houston County, MN, Jackson County, MN, Le Sueur County, MN, Lyon County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Pipestone County, MN, Redwood County, MN, Rice County, MN, Rock County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Buffalo County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Walworth County, WI

The radar

The Minneapolis radar (KMPX), 150 km from the middle of the area, began a volume at 13:43 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

Minneapolis, MN (KMPX), launched 12:00Z, 1.7 hours before the alert went out and 150 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: 723 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -62 m²/s²
0-3 km storm-relative helicity: 33 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
Apr 13, 2:06 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Clarke, Decatur, Fremont and 8 more	2 hr
Apr 13, 2:19 PM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Cass, Clarke, Davis and 17 more	7 hr
Apr 13, 3:22 PM CDT	Severe Thunderstorm Watch	SPC	Audubon, Black Hawk, Boone, Calhoun, Carroll, Dallas and 13 more	6 hr
Apr 13, 5:31 PM CDT	Mesoscale Discussion	SPC	Audubon, Carroll, Cass, Fremont, Greene, Guthrie and 5 more	29 min
Apr 13, 4:52 AM CDT	Mesoscale Discussion	SPC	Bennett, Haakon, Jackson, Jones, Meade, Mellette and 5 more	6 hr

Nearby

Mesoscale Discussions in Minnesota, 2018 Mesoscale Discussions in Wisconsin, 2018 Mesoscale Discussions in Iowa, 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.