Alert archive / Wisconsin / Mesoscale Discussions in 2017

Mesoscale Discussion 742

May 16, 2017Dickinson County, Iron County, Menominee County, Michigan; Wabasha County, Minnesota; 24 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 16, 2017, 9:14 PM CDT for Dickinson County, Iron County, Menominee County, Michigan; Wabasha County, Minnesota; 24 counties in Wisconsin. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
May 16, 2017, 9:14 PM CDT (02:14 UTC)
Expired
May 16, 2017, 10:15 PM CDT
In force
61 min
Issued by
the Storm Prediction Center
All 28 counties

Dickinson County, MI, Iron County, MI, Menominee County, MI, Wabasha County, MN, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Jackson County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Pepin County, WI, Portage County, WI, Price County, WI, Rusk County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vilas County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 153 km from the middle of the area, began a volume at 02:14 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.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 2.2 hours before the alert went out and 155 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 00:00Z on 2017-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 234 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 00:00Z on 2017-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 152 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
234 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
1926 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
152 m²/s²
0-3 km storm-relative helicity
240 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.1

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.

IssuedProductOfficeCountiesLasted
May 16, 9:47 PM CDTSevere Thunderstorm WatchSPCMenominee5 hr
May 16, 8:46 PM CDTSevere Thunderstorm WatchSPCDodge, Fillmore, Freeborn, Houston, Mower, Olmsted and 2 more5 hr
May 16, 11:48 PM CDTMesoscale DiscussionSPCDodge, Fillmore, Houston, Mower, Olmsted, Steele and 2 more117 min
May 17, 12:23 PM CDTMesoscale DiscussionSPCHouston, Winona97 min
May 17, 2:38 PM CDTMesoscale DiscussionSPCDakota, Dodge, Fillmore, Freeborn, Goodhue, Houston and 7 more97 min
May 17, 2:53 PM CDTTornado WatchSPCBlue Earth, Brown, Cottonwood, Dakota, Faribault, Freeborn and 16 more6 hr
May 17, 3:13 PM CDTTornado WatchSPCDodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more9 hr
May 17, 6:05 PM CDTMesoscale DiscussionSPCFillmore, Houston, Mower55 min
May 17, 6:31 PM CDTMesoscale DiscussionSPCAdams, Chippewa, Clark, Columbia, Dodge, Eau Claire and 17 more89 min

Nearby

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