Alert archive / Minnesota / Mesoscale Discussions in 2008

Mesoscale Discussion 1780

July 14, 200815 counties in Minnesota; Bayfield County, Douglas County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2008, 9:33 PM CDT for 15 counties in Minnesota; Bayfield County, Douglas County, Wisconsin. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jul 14, 2008, 9:33 PM CDT (02:33 UTC)
Expired: Jul 14, 2008, 10:30 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Aitkin County, MN, Becker County, MN, Beltrami County, MN, Carlton County, MN, Cass County, MN, Clearwater County, MN, Cook County, MN, Crow Wing County, MN, Hubbard County, MN, Itasca County, MN, Koochiching County, MN, Lake County, MN, Otter Tail County, MN, Saint Louis County, MN, Wadena County, MN, Bayfield County, WI, Douglas County, WI

The radar

The Duluth radar (KDLH), 93 km from the middle of the area, began a volume at 02:36 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, 2.6 hours before the alert went out and 170 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: 481 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1737 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 265 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 9.4

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 14, 7:34 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Becker, Beltrami, Carlton, Cass, Clearwater and 9 more	6 hr
Jul 14, 11:22 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Carlton, Cass, Clearwater, Crow Wing and 6 more	53 min
Jul 15, 1:18 AM CDT	Mesoscale Discussion	SPC	Aitkin, Carlton, Cass, Crow Wing, Itasca, Lake and 2 more	57 min
Jul 15, 5:33 PM CDT	Mesoscale Discussion	SPC	Fillmore, Houston, Winona	57 min

Nearby

Mesoscale Discussions in Minnesota, 2008 Mesoscale Discussions in Wisconsin, 2008 Every mesoscale discussion in 2008

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.