Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 1006

July 4, 20187 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2018, 7:10 AM CDT for 7 counties in Minnesota. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2018, 7:10 AM CDT (12:10 UTC)
Expired: Jul 4, 2018, 8:45 AM CDT
In force: 95 min
Issued by: the Storm Prediction Center

Counties Aitkin County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Itasca County, MN, Koochiching County, MN, Saint Louis County, MN

The radar

The Duluth radar (KDLH), 121 km from the middle of the area, began a volume at 12:13 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, 0.2 hours before the alert went out and 264 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: 2175 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1013 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.4
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 4, 12:49 AM CDT	Mesoscale Discussion	SPC	Clay, Marshall, Norman, Pennington, Polk, Red Lake and 1 more	116 min
Jul 4, 1:34 AM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 11 more	7 hr
Jul 4, 3:14 AM CDT	Mesoscale Discussion	SPC	Big Stone, Traverse	91 min
Jul 4, 9:56 AM CDT	Mesoscale Discussion	SPC	Cook, Dodge, Fillmore, Houston, Lake, Mower and 3 more	2 hr
Jul 4, 10:27 AM CDT	Mesoscale Discussion	SPC	Freeborn, Mower	2 hr

Nearby

Mesoscale Discussions in Minnesota, 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.