Alert archive / Minnesota / Mesoscale Discussions in 2014

Mesoscale Discussion 1669

September 3, 201429 counties in Minnesota; Deuel County, Grant County, South Dakota; 4 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 3, 2014, 12:19 PM CDT for 29 counties in Minnesota; Deuel County, Grant County, South Dakota; 4 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 3, 2014, 12:19 PM CDT (17:19 UTC)
Expired: Sep 3, 2014, 2:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 35 counties

Anoka County, MN, Benton County, MN, Big Stone County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Dakota County, MN, Hennepin County, MN, Isanti County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Pope County, MN, Ramsey County, MN, Renville County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Washington County, MN, Wright County, MN, Yellow Medicine County, MN, Deuel County, SD, Grant County, SD, Burnett County, WI, Pierce County, WI, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 98 km from the middle of the area, began a volume at 17:21 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 12:00Z, 5.3 hours before the alert went out and 95 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1649 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 67 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
Sep 3, 5:07 PM CDT	Mesoscale Discussion	SPC	Benton, Chisago, Isanti, Kanabec, Mille Lacs, Morrison and 4 more	83 min

Nearby

Mesoscale Discussions in Minnesota, 2014 Mesoscale Discussions in Wisconsin, 2014 Mesoscale Discussions in South Dakota, 2014 Every mesoscale discussion in 2014

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.