Alert archive / Minnesota / Mesoscale Discussions in 2013

Mesoscale Discussion 1771

August 25, 201315 counties in Minnesota; Douglas County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2013, 3:55 PM CDT for 15 counties in Minnesota; Douglas County, Wisconsin. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Aug 25, 2013, 3:55 PM CDT (20:55 UTC)
Expired: Aug 25, 2013, 5:00 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Aitkin County, MN, Becker County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Douglas County, MN, Hubbard County, MN, Itasca County, MN, Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pine County, MN, Todd County, MN, Wadena County, MN, Douglas County, WI

The radar

The Duluth radar (KDLH), 126 km from the middle of the area, began a volume at 20:56 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, 8.9 hours before the alert went out and 227 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: 2993 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 753 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.4

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 24, 7:41 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Itasca, Kittson and 9 more	94 min
Aug 25, 4:26 AM CDT	Mesoscale Discussion	SPC	Becker, Cass, Hubbard	3 hr

Nearby

Mesoscale Discussions in Minnesota, 2013 Mesoscale Discussions in Wisconsin, 2013 Every mesoscale discussion in 2013

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.