Alert archive / Iowa / Mesoscale Discussions in 2015

Mesoscale Discussion 1736

August 22, 201510 counties in Iowa; 7 counties in Minnesota; 7 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2015, 6:12 PM CDT for 10 counties in Iowa; 7 counties in Minnesota; 7 counties in Wisconsin. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Aug 22, 2015, 6:12 PM CDT (23:12 UTC)
Expired: Aug 22, 2015, 7:15 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 24 counties

Allamakee County, IA, Bremer County, IA, Butler County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Crawford County, WI, Grant County, WI, La Crosse County, WI, Monroe County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 79 km from the middle of the area, began a volume at 23:13 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 12:00Z, 11.2 hours before the alert went out and 201 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: 445 J/kg
Mixed-layer CIN: -348 J/kg
Mixed-layer LCL: 1017 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Aug 22, 2:13 PM CDT	Mesoscale Discussion	SPC	Audubon, Boone, Buena Vista, Calhoun, Carroll, Cerro Gordo and 33 more	62 min
Aug 22, 2:35 PM CDT	Tornado Watch	SPC	Buena Vista, Calhoun, Cerro Gordo, Cherokee, Clay, Dickinson and 21 more	7 hr
Aug 22, 2:55 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 19 more	65 min
Aug 22, 3:48 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 25 more	8 hr
Aug 22, 5:52 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Cerro Gordo, Clay, Emmet, Franklin, Hamilton and 10 more	83 min
Aug 22, 6:21 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Carroll, Cass, Clarke and 15 more	84 min
Aug 22, 2:35 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Cass, Clay, Clearwater and 18 more	55 min
Aug 22, 2:56 PM CDT	Tornado Watch	SPC	Aitkin, Becker, Beltrami, Carlton, Cass, Clay and 20 more	8 hr
Aug 22, 5:42 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Carlton, Cass, Clearwater and 16 more	93 min

Nearby

Mesoscale Discussions in Iowa, 2015 Mesoscale Discussions in Minnesota, 2015 Mesoscale Discussions in Wisconsin, 2015 Every mesoscale discussion in 2015

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.