Alert archive / Minnesota / Mesoscale Discussions in 2015

Mesoscale Discussion 1669

August 12, 201518 counties in Minnesota; 4 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2015, 5:41 PM CDT for 18 counties in Minnesota; 4 counties in North Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 12, 2015, 5:41 PM CDT (22:41 UTC)
Expired: Aug 12, 2015, 7:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 22 counties

Becker County, MN, Beltrami County, MN, Cass County, MN, Clearwater County, MN, Crow Wing County, MN, Hubbard County, MN, Itasca County, MN, Kittson County, MN, Koochiching County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Wadena County, MN, Grand Forks County, ND, Pembina County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 143 km from the middle of the area, began a volume at 22:42 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 12:00Z, 10.7 hours before the alert went out and 179 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: 40 J/kg
Mixed-layer CIN: -386 J/kg
Mixed-layer LCL: 1826 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 1:52 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 10 more	113 min
Aug 12, 3:33 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Cass, Clearwater, Crow Wing, Hubbard and 12 more	9 hr
Aug 12, 6:51 PM CDT	Mesoscale Discussion	SPC	Benton, Meeker, Mille Lacs, Morrison, Sherburne, Stearns and 2 more	54 min
Aug 12, 4:46 PM CDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Golden Valley, Hettinger, Slope and 1 more	59 min

Nearby

Mesoscale Discussions in Minnesota, 2015 Mesoscale Discussions in North Dakota, 2015 Every mesoscale discussion in 2015

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.