Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 1357

August 26, 201812 counties in Minnesota; Cass County, North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2018, 2:46 AM CDT for 12 counties in Minnesota; Cass County, North Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 26, 2018, 2:46 AM CDT (07:46 UTC)
Expired: Aug 26, 2018, 5:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Becker County, MN, Benton County, MN, Clay County, MN, Crow Wing County, MN, Douglas County, MN, Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Todd County, MN, Wadena County, MN, Wilkin County, MN, Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 193 km from the middle of the area, began a volume at 07:47 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 00:00Z, 7.8 hours before the alert went out and 220 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: 50 J/kg
Mixed-layer CIN: -418 J/kg
Mixed-layer LCL: 1061 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 84 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
Aug 25, 10:08 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Douglas, Mahnomen, Norman, Otter Tail and 2 more	97 min
Aug 26, 9:53 AM CDT	Mesoscale Discussion	SPC	Jackson, Nobles	2 hr
Aug 26, 11:56 AM CDT	Mesoscale Discussion	SPC	Becker, Cass, Clay, Crow Wing, Douglas, Grant and 6 more	109 min
Aug 26, 1:42 PM CDT	Mesoscale Discussion	SPC	Big Stone, Grant, Lac qui Parle, Stevens, Traverse	3 hr
Aug 26, 5:14 PM CDT	Mesoscale Discussion	SPC	Aitkin, Carlton, Cass, Crow Wing	2 hr
Aug 26, 6:15 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Grant, Hubbard and 10 more	3 hr
Aug 26, 5:42 AM CDT	Mesoscale Discussion	SPC	Dickey, Emmons, LaMoure, Logan, McIntosh, Sioux	3 hr
Aug 26, 3:52 PM CDT	Mesoscale Discussion	SPC	Burke, Divide, McKenzie, Mountrail, Renville, Ward and 1 more	113 min

Nearby

Mesoscale Discussions in Minnesota, 2018 Mesoscale Discussions in North Dakota, 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.