Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 1040

July 11, 201818 counties in Minnesota; Richland County, North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2018, 8:58 PM CDT for 18 counties in Minnesota; Richland County, North Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 11, 2018, 8:58 PM CDT (01:58 UTC)
Expired: Jul 11, 2018, 11:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Aitkin County, MN, Becker County, MN, Beltrami County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Hubbard County, MN, Itasca County, MN, Koochiching County, MN, Mahnomen County, MN, Morrison County, MN, Otter Tail County, MN, Todd County, MN, Wadena County, MN, Wilkin County, MN, Richland County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 183 km from the middle of the area, began a volume at 02:02 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, 2.0 hours before the alert went out and 233 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, 11:42 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Carlton, Cass, Crow Wing, Hubbard and 10 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 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.