Alert archive / Minnesota / Mesoscale Discussions in 2012

Mesoscale Discussion 1581

July 25, 20128 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2012, 3:41 AM CDT for 8 counties in Minnesota. It was in force for 34 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2012, 3:41 AM CDT (08:41 UTC)
Expired: Jul 25, 2012, 4:15 AM CDT
In force: 34 min
Issued by: the Storm Prediction Center

Counties Becker County, MN, Clay County, MN, Grant County, MN, Hubbard County, MN, Mahnomen County, MN, Otter Tail County, MN, Wadena County, MN, Wilkin County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 138 km from the middle of the area, began a volume at 08:45 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

Minneapolis, MN (KMPX), launched 00:00Z, 8.7 hours before the alert went out and 277 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: 1518 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 877 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 392 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 17.7

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
Jul 24, 9:08 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Cass, Clay, Crow Wing, Douglas, Grant and 8 more	7 hr
Jul 24, 11:24 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Benton, Big Stone, Cass, Clay and 20 more	96 min
Jul 25, 2:05 AM CDT	Mesoscale Discussion	SPC	Aitkin, Carlton, Cass, Crow Wing, Pine	55 min
Jul 25, 2:24 AM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 13 more	5 hr
Jul 25, 5:24 AM CDT	Mesoscale Discussion	SPC	Aitkin, Benton, Big Stone, Carlton, Cass, Chisago and 20 more	66 min
Jul 25, 1:56 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Big Stone, Clay, Clearwater, Grant and 14 more	2 hr
Jul 25, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Goodhue and 11 more	8 hr

Nearby

Mesoscale Discussions in Minnesota, 2012 Every mesoscale discussion in 2012

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.