Alert archive / Wisconsin / Mesoscale Discussions in 2018

Mesoscale Discussion 1236

August 5, 20188 counties in Michigan; 17 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 5, 2018, 4:57 PM EDT for 8 counties in Michigan; 17 counties in Wisconsin. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Aug 5, 2018, 4:57 PM EDT (20:57 UTC)
Expired
Aug 5, 2018, 6:30 PM EDT
In force
93 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 25 counties

Baraga County, MI, Delta County, MI, Dickinson County, MI, Gogebic County, MI, Iron County, MI, Marquette County, MI, Menominee County, MI, Ontonagon County, MI, Ashland County, WI, Barron County, WI, Bayfield County, WI, Burnett County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Langlade County, WI, Lincoln County, WI, Marinette County, WI, Oneida County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Taylor County, WI, Vilas County, WI, Washburn County, WI

The radar

The Marquette radar (KMQT), 148 km from the middle of the area, began a volume at 20:57 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 12:00Z, 9.0 hours before the alert went out and 203 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 12:00Z on 2018-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 795 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 12:00Z on 2018-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 198 square meters per square second.19395878Sfc1 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
795 J/kg
Mixed-layer CIN
-167 J/kg
Mixed-layer LCL
1079 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
198 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

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
Aug 5, 6:44 PM EDTMesoscale DiscussionSPCGreen, Lafayette2 hr

Nearby

Mesoscale Discussions in Wisconsin, 2018Mesoscale Discussions in Michigan, 2018Every 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.