Alert archive / Wisconsin / Mesoscale Discussions in 2017

Mesoscale Discussion 1173

June 28, 20179 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2017, 5:00 PM CDT for 9 counties in Wisconsin. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued: Jun 28, 2017, 5:00 PM CDT (22:00 UTC)
Expired: Jun 28, 2017, 5:30 PM CDT
In force: 30 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Rock County, WI, Sauk County, WI

The radar

The Milwaukee radar (KMKX), 78 km from the middle of the area, began a volume at 22:01 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.

Tornado Watch 377Jun 28, 5:15 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.0 hours before the alert went out and 182 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: 134 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 1152 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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
Jun 28, 2:49 PM CDT	Mesoscale Discussion	SPC	Barron, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 13 more	116 min
Jun 28, 2:53 PM CDT	Tornado Watch	SPC	Grant	9 hr
Jun 28, 4:09 PM CDT	Tornado Watch	SPC	Barron, Buffalo, Burnett, Chippewa, Clark, Dunn and 15 more	6 hr
Jun 28, 5:14 PM CDT	Tornado Watch	SPC	Columbia, Dane, Dodge, Green, Iowa, Jefferson and 10 more	4 hr
Jun 28, 5:29 PM CDT	Mesoscale Discussion	SPC	Grant, Lafayette	91 min

Nearby

Mesoscale Discussions in Wisconsin, 2017 Every mesoscale discussion in 2017

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.