Alert archive / Minnesota / Mesoscale Discussions in 2016

Mesoscale Discussion 1475

August 4, 201611 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2016, 2:59 AM CDT for 11 counties in Minnesota. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued: Aug 4, 2016, 2:59 AM CDT (07:59 UTC)
Expired: Aug 4, 2016, 3:30 AM CDT
In force: 31 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Aitkin County, MN, Benton County, MN, Carlton County, MN, Chisago County, MN, Crow Wing County, MN, Isanti County, MN, Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN, Pine County, MN, Sherburne County, MN

The radar

The Minneapolis radar (KMPX), 128 km from the middle of the area, began a volume at 08:02 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, 8.0 hours before the alert went out and 128 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: 1240 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 1342 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 3, 9:07 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Cass, Clay, Clearwater and 15 more	113 min
Aug 3, 10:59 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Big Stone, Cass, Clay, Clearwater and 21 more	7 hr
Aug 4, 3:58 AM CDT	Mesoscale Discussion	SPC	Brown, Cottonwood, Jackson, Lincoln, Lyon, Murray and 5 more	62 min
Aug 4, 4:48 PM CDT	Mesoscale Discussion	SPC	Fillmore, Houston	87 min

Nearby

Mesoscale Discussions in Minnesota, 2016 Every mesoscale discussion in 2016

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.