Alert archive / Wisconsin / Mesoscale Discussions in 2017

Mesoscale Discussion 991

June 11, 2017Delta County, Dickinson County, Menominee County, Michigan; 17 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2017, 10:39 PM EDT for Delta County, Dickinson County, Menominee County, Michigan; 17 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 11, 2017, 10:39 PM EDT (02:39 UTC)
Expired: Jun 12, 2017, 12:45 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Delta County, MI, Dickinson County, MI, Menominee County, MI, Chippewa County, WI, Clark County, WI, Door County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 101 km from the middle of the area, began a volume at 02:39 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 2.7 hours before the alert went out and 103 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: 428 J/kg
Mixed-layer CIN: -274 J/kg
Mixed-layer LCL: 1257 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 288 m²/s²
0-3 km storm-relative helicity: 452 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

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 11, 9:01 PM EDT	Severe Thunderstorm Watch	SPC	Delta, Dickinson, Menominee	6 hr
Jun 12, 12:59 AM EDT	Mesoscale Discussion	SPC	Delta, Menominee	91 min
Jun 12, 6:48 PM EDT	Mesoscale Discussion	SPC	Clare, Lake, Manistee, Mason, Missaukee, Osceola and 2 more	2 hr
Jun 12, 12:28 PM EDT	Mesoscale Discussion	SPC	Crawford, La Crosse, Vernon	92 min
Jun 12, 12:47 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Crawford, Grant, Jackson, Juneau and 5 more	7 hr
Jun 12, 3:22 PM EDT	Mesoscale Discussion	SPC	Buffalo, Crawford, Jackson, La Crosse, Monroe, Trempealeau and 1 more	113 min
Jun 12, 5:37 PM EDT	Severe Thunderstorm Watch	SPC	Brown, Calumet, Columbia, Dane, Dodge, Door and 29 more	5 hr
Jun 12, 7:38 PM EDT	Mesoscale Discussion	SPC	Brown, Calumet, Columbia, Dane, Dodge, Fond du Lac and 24 more	2 hr

Nearby

Mesoscale Discussions in Wisconsin, 2017 Mesoscale Discussions in Michigan, 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.