Alert archive / Wisconsin / Mesoscale Discussions in 2018

Mesoscale Discussion 959

June 30, 20188 counties in Michigan; 40 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2018, 5:23 PM EDT for 8 counties in Michigan; 40 counties in Wisconsin. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2018, 5:23 PM EDT (21:23 UTC)
Expired: Jun 30, 2018, 6:30 PM EDT
In force: 67 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 48 counties

Baraga County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Marquette County, MI, Menominee County, MI, Ontonagon County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Florence County, WI, Fond du Lac County, WI, Forest County, WI, Grant County, WI, Green Lake County, WI, Iowa County, WI, Iron County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Price County, WI, Richland County, WI, Sauk County, WI, Shawano County, WI, Taylor County, WI, Vernon County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 106 km from the middle of the area, began a volume at 21:26 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.

Severe Thunderstorm Watch 249Jun 30, 5:40 PM EDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.4 hours before the alert went out and 108 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: 2313 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 99 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
Jun 30, 4:21 AM EDT	Mesoscale Discussion	SPC	Baraga, Dickinson, Gogebic, Houghton, Iron, Keweenaw and 2 more	114 min
Jun 30, 5:41 PM EDT	Severe Thunderstorm Watch	SPC	Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 5 more	6 hr
Jun 30, 12:56 AM EDT	Severe Thunderstorm Watch	SPC	Bayfield, Douglas	5 hr
Jun 30, 2:39 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Barron, Buffalo, Chippewa, Clark, Crawford and 16 more	7 hr
Jun 30, 4:40 PM EDT	Mesoscale Discussion	SPC	Buffalo, Chippewa, Dunn, Eau Claire, Jackson, La Crosse and 4 more	2 hr

Nearby

Mesoscale Discussions in Wisconsin, 2018 Mesoscale Discussions in Michigan, 2018 Every mesoscale discussion in 2018

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.