Alert archive / Minnesota / Mesoscale Discussions in 2017

Mesoscale Discussion 1234

July 4, 201717 counties in Minnesota; 7 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2017, 9:21 PM CDT for 17 counties in Minnesota; 7 counties in North Dakota. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2017, 9:21 PM CDT (02:21 UTC)
Expired: Jul 4, 2017, 10:45 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 24 counties

Becker County, MN, Beltrami County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Hubbard County, MN, Itasca County, MN, Koochiching County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 97 km from the middle of the area, began a volume at 02:21 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

International Fa, MN (KINL), launched 00:00Z, 2.4 hours before the alert went out and 239 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: 2145 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.4

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 5, 5:52 PM CDT	Mesoscale Discussion	SPC	Becker, Big Stone, Clay, Clearwater, Douglas, Grant and 15 more	2 hr
Jul 5, 3:09 PM CDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Dunn, Golden Valley, Grant and 3 more	2 hr

Nearby

Mesoscale Discussions in Minnesota, 2017 Mesoscale Discussions in North Dakota, 2017 Every mesoscale discussion in 2017

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.