Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 1041

July 11, 201816 counties in Minnesota; Douglas County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2018, 11:42 PM CDT for 16 counties in Minnesota; Douglas County, Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 11, 2018, 11:42 PM CDT (04:42 UTC)
Expired: Jul 12, 2018, 1:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Aitkin County, MN, Becker County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Hubbard County, MN, Itasca County, MN, Kanabec County, MN, Koochiching County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pine County, MN, Saint Louis County, MN, Todd County, MN, Wadena County, MN, Douglas County, WI

The radar

The Duluth radar (KDLH), 113 km from the middle of the area, began a volume at 04:43 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 272Jul 12, 12:55 AM CDT

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 4.7 hours before the alert went out and 181 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: 626 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 938 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 416 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.1

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
Jul 11, 8:58 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Cass, Clay, Clearwater and 12 more	2 hr
Jul 12, 12:57 AM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Carlton, Cass, Crow Wing, Itasca, Lake and 2 more	6 hr
Jul 12, 4:47 PM CDT	Mesoscale Discussion	SPC	Anoka, Blue Earth, Brown, Carver, Cottonwood, Dakota and 31 more	88 min
Jul 12, 5:04 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Blue Earth, Brown, Carver, Chisago, Cottonwood and 30 more	7 hr

Nearby

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