Alert archive / Wisconsin / Mesoscale Discussions in 2020

Mesoscale Discussion 1433

August 9, 2020Chisago County, Pine County, Washington County, Minnesota; 21 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2020, 12:30 PM CDT for Chisago County, Pine County, Washington County, Minnesota; 21 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 9, 2020, 12:30 PM CDT (17:30 UTC)
Expired: Aug 9, 2020, 3:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 60%

All 24 counties

Chisago County, MN, Pine County, MN, Washington County, MN, Barron County, WI, Bayfield County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Iron County, WI, Lincoln County, WI, Marathon County, WI, Oneida County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 172 km from the middle of the area, began a volume at 17:32 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, 5.5 hours before the alert went out and 196 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: 177 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1013 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -94 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 8, 10:10 PM CDT	Severe Thunderstorm Watch	SPC	Lincoln, Murray, Nobles, Pipestone, Rock	6 hr
Aug 9, 1:46 AM CDT	Mesoscale Discussion	SPC	Lincoln, Lyon, Murray, Nobles, Pipestone, Rock	59 min
Aug 9, 11:48 AM CDT	Mesoscale Discussion	SPC	Beltrami, Clearwater, Kittson, Lake of the Woods, Mahnomen, Marshall and 5 more	57 min
Aug 9, 12:18 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Clay, Clearwater, Grant, Hubbard and 12 more	6 hr
Aug 9, 2:30 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Clay, Clearwater, Grant, Mahnomen and 9 more	90 min
Aug 9, 5:09 PM CDT	Mesoscale Discussion	SPC	Becker, Beltrami, Big Stone, Clay, Clearwater, Douglas and 11 more	96 min
Aug 9, 1:30 PM CDT	Mesoscale Discussion	SPC	Columbia, Crawford, Dane, Grant, Green, Iowa and 6 more	2 hr
Aug 9, 3:46 PM CDT	Mesoscale Discussion	SPC	Ashland, Bayfield, Forest, Iron, Langlade, Lincoln and 7 more	89 min

Nearby

Mesoscale Discussions in Wisconsin, 2020 Mesoscale Discussions in Minnesota, 2020 Every mesoscale discussion in 2020

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.