Alert archive / Minnesota / Mesoscale Discussions in 2015

Mesoscale Discussion 1670

August 12, 20158 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2015, 6:51 PM CDT for 8 counties in Minnesota. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Aug 12, 2015, 6:51 PM CDT (23:51 UTC)
Expired: Aug 12, 2015, 7:45 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Benton County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Sherburne County, MN, Stearns County, MN, Todd County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 114 km from the middle of the area, began a volume at 23:52 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 486Aug 12, 7:00 PM CDT

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 11.9 hours before the alert went out and 319 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, 5:41 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Cass, Clearwater, Crow Wing, Hubbard and 12 more	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.