Alert archive / Wisconsin / Mesoscale Discussions in 2016

Mesoscale Discussion 1559

August 18, 20164 counties in Iowa; 5 counties in Minnesota; 6 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2016, 5:48 PM CDT for 4 counties in Iowa; 5 counties in Minnesota; 6 counties in Wisconsin. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Aug 18, 2016, 5:48 PM CDT (22:48 UTC)
Expired: Aug 18, 2016, 7:15 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Allamakee County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Winona County, MN, Crawford County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Sauk County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 49 km from the middle of the area, began a volume at 22:50 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 451Aug 18, 6:05 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.8 hours before the alert went out and 205 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: 133 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 1165 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 109 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
Aug 18, 2:31 PM CDT	Mesoscale Discussion	SPC	Mitchell, Worth	89 min
Aug 18, 2:46 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more	6 hr
Aug 18, 7:17 AM CDT	Mesoscale Discussion	SPC	Becker, Clay, Douglas, Grant, Otter Tail, Pope and 5 more	2 hr
Aug 18, 6:04 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Columbia, Crawford, Dane, Grant, Green and 9 more	4 hr

Nearby

Mesoscale Discussions in Wisconsin, 2016 Mesoscale Discussions in Minnesota, 2016 Mesoscale Discussions in Iowa, 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.