Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1664

July 19, 201120 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2011, 5:28 PM CDT for 20 counties in Wisconsin. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2011, 5:28 PM CDT (22:28 UTC)
Expired: Jul 19, 2011, 6:30 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Barron County, WI, Chippewa County, WI, Clark County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Shawano County, WI, Taylor County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 199 km from the middle of the area, began a volume at 22:28 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 664Jul 19, 5:45 PM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.5 hours before the alert went out and 210 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: 1299 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 875 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.0

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 18, 9:06 PM CDT	Mesoscale Discussion	SPC	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more	54 min
Jul 19, 9:07 AM CDT	Severe Thunderstorm Watch	SPC	Barron, Buffalo, Burnett, Chippewa, Clark, Dunn and 14 more	6 hr
Jul 19, 11:57 AM CDT	Mesoscale Discussion	SPC	Buffalo, Crawford, La Crosse, Pepin, Pierce, Trempealeau and 1 more	93 min
Jul 19, 1:04 PM CDT	Mesoscale Discussion	SPC	Crawford, Grant, Green, Iowa, La Crosse, Lafayette and 3 more	86 min
Jul 19, 5:43 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Barron, Brown, Calumet, Chippewa, Clark and 32 more	7 hr

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.