Alert archive / Wisconsin / Mesoscale Discussions in 2016

Mesoscale Discussion 1350

July 21, 201615 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2016, 3:20 PM CDT for 15 counties in Wisconsin. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2016, 3:20 PM CDT (20:20 UTC)
Expired: Jul 21, 2016, 5:15 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Adams County, WI, Buffalo County, WI, Columbia County, WI, Eau Claire County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 53 km from the middle of the area, began a volume at 20:22 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 406Jul 21, 4:25 PM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.3 hours before the alert went out and 208 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: 1904 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 686 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 154 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
Jul 21, 12:32 AM CDT	Severe Thunderstorm Watch	SPC	Ashland, Barron, Bayfield, Burnett, Chippewa, Douglas and 8 more	6 hr
Jul 21, 2:30 AM CDT	Mesoscale Discussion	SPC	Bayfield, Burnett, Douglas, Washburn	2 hr
Jul 21, 3:54 AM CDT	Mesoscale Discussion	SPC	Ashland, Bayfield, Burnett, Douglas, Florence, Forest and 8 more	2 hr
Jul 21, 4:31 AM CDT	Severe Thunderstorm Watch	SPC	Brown, Calumet, Door, Florence, Forest, Kewaunee and 12 more	6 hr
Jul 21, 6:39 AM CDT	Mesoscale Discussion	SPC	Buffalo, Clark, Eau Claire, Florence, Forest, Jackson and 15 more	2 hr
Jul 21, 8:28 AM CDT	Mesoscale Discussion	SPC	Calumet, Columbia, Dane, Dodge, Fond du Lac, Green and 16 more	2 hr
Jul 21, 8:45 AM CDT	Severe Thunderstorm Watch	SPC	Columbia, Dodge, Fond du Lac, Green Lake, Jefferson, Marquette and 5 more	7 hr
Jul 21, 11:19 AM CDT	Mesoscale Discussion	SPC	Milwaukee, Racine	116 min
Jul 21, 4:26 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 13 more	5 hr
Jul 21, 5:42 PM CDT	Mesoscale Discussion	SPC	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 12 more	93 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.