Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1177

June 17, 2007Dickinson County, Iron County, Menominee County, Michigan; 11 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2007, 1:20 PM CDT for Dickinson County, Iron County, Menominee County, Michigan; 11 counties in Wisconsin. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2007, 1:20 PM CDT (18:20 UTC)
Expired: Jun 17, 2007, 2:45 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Dickinson County, MI, Iron County, MI, Menominee County, MI, 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, Vilas County, WI

The radar

The Green Bay radar (KGRB), 99 km from the middle of the area, began a volume at 18:20 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 407Jun 17, 1:35 PM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.3 hours before the alert went out and 101 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1085 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jun 17, 1:35 PM CDT	Tornado Watch	SPC	Dickinson, Iron, Menominee	5 hr
Jun 17, 6:17 PM CDT	Mesoscale Discussion	SPC	Iron, Menominee	58 min

Nearby

Mesoscale Discussions in Wisconsin, 2007 Mesoscale Discussions in Michigan, 2007 Every mesoscale discussion in 2007

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.