Alert archive / Wisconsin / Mesoscale Discussions in 2016

Mesoscale Discussion 1719

September 19, 201613 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 19, 2016, 2:19 PM CDT for 13 counties in Wisconsin. It was in force for 26 min.

The area

The outline as issued.

The facts

Issued: Sep 19, 2016, 2:19 PM CDT (19:19 UTC)
Expired: Sep 19, 2016, 2:45 PM CDT
In force: 26 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green Lake County, WI, Iowa County, WI, Juneau County, WI, Marquette County, WI, Ozaukee County, WI, Richland County, WI, Sauk County, WI, Vernon County, WI, Washington County, WI

The radar

The Milwaukee radar (KMKX), 99 km from the middle of the area, began a volume at 19:23 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 483Sep 19, 2:30 PM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.3 hours before the alert went out and 162 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: 9 J/kg
Mixed-layer CIN: -277 J/kg
Mixed-layer LCL: 1502 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 240 m²/s²
0-3 km storm-relative helicity: 287 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Sep 19, 2:02 PM CDT	Mesoscale Discussion	SPC	Grant, Green, Iowa, Lafayette	58 min
Sep 19, 2:31 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Crawford, Dane, Dodge, Grant, Green and 13 more	3 hr
Sep 19, 5:07 PM CDT	Mesoscale Discussion	SPC	Columbia, Crawford, Dane, Dodge, Grant, Green and 14 more	113 min

Nearby

Mesoscale Discussions in Wisconsin, 2016 Every mesoscale discussion in 2016

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.