Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1665

July 19, 201111 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2011, 7:38 PM CDT for 11 counties in Wisconsin. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2011, 7:38 PM CDT (00:38 UTC)
Expired: Jul 19, 2011, 8:45 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Adams County, WI, Barron County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, Portage County, WI, Taylor County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 130 km from the middle of the area, began a volume at 00:38 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

Minneapolis, MN (KMPX), launched 00:00Z, 0.6 hours before the alert went out and 206 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: 5426 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1247 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 253 m²/s²
0-3 km storm-relative helicity: 330 m²/s²
Significant tornado parameter: 4.8
Supercell composite: 44.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 10:16 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Clark, Dodge, Fond du Lac and 23 more	119 min
Jul 19, 11:27 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Dane, Dodge, Fond du Lac, Green Lake, Jefferson and 11 more	2 hr
Jul 20, 6:55 PM CDT	Mesoscale Discussion	SPC	Ashland, Bayfield, Douglas	95 min

Nearby

Mesoscale Discussions in Wisconsin, 2011 Every mesoscale discussion in 2011

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.