Alert archive / Minnesota / Mesoscale Discussions in 2015

Mesoscale Discussion 1671

August 12, 20155 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2015, 9:57 PM CDT for 5 counties in Minnesota. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Aug 12, 2015, 9:57 PM CDT (02:57 UTC)
Expired: Aug 12, 2015, 11:00 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Clearwater County, MN, Hubbard County, MN, Mahnomen County, MN, Pennington County, MN, Red Lake County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 147 km from the middle of the area, began a volume at 02:57 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, 3.0 hours before the alert went out and 209 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: 1493 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1383 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 227 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 11.5

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, 7:03 PM CDT	Severe Thunderstorm Watch	SPC	Anoka, Benton, Carver, Chisago, Dakota, Hennepin and 13 more	3 hr
Aug 13, 2:24 PM CDT	Mesoscale Discussion	SPC	Fillmore, Houston, Olmsted, Wabasha, Winona	2 hr

Nearby

Mesoscale Discussions in Minnesota, 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.