Alert archive / Minnesota / Mesoscale Discussions in 2013

Mesoscale Discussion 1795

August 29, 201316 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2013, 9:29 AM CDT for 16 counties in Minnesota. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Aug 29, 2013, 9:29 AM CDT (14:29 UTC)
Expired: Aug 29, 2013, 11:00 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Aitkin County, MN, Becker County, MN, Beltrami County, MN, Cass County, MN, Clearwater County, MN, Cook County, MN, Crow Wing County, MN, Hubbard County, MN, Itasca County, MN, Koochiching County, MN, Lake County, MN, Lake of the Woods County, MN, Morrison County, MN, Otter Tail County, MN, Saint Louis County, MN, Wadena County, MN

The radar

The Duluth radar (KDLH), 162 km from the middle of the area, began a volume at 14:29 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, 2.5 hours before the alert went out and 49 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: 400 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 1263 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 38 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 29, 2:27 AM CDT	Mesoscale Discussion	SPC	Clay, Wilkin	2 hr
Aug 29, 6:12 AM CDT	Severe Thunderstorm Watch	SPC	Becker, Clay, Clearwater, Kittson, Mahnomen, Marshall and 5 more	4 hr
Aug 29, 4:03 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Cass, Chisago, Crow Wing and 13 more	117 min
Aug 29, 5:46 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 10 more	5 hr

Nearby

Mesoscale Discussions in Minnesota, 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.