Alert archive / Iowa / Mesoscale Discussions in 2017

Mesoscale Discussion 1351

July 19, 20174 counties in Iowa; Fillmore County, Houston County, Mower County, Minnesota; Crawford County, Vernon County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2017, 2:38 PM CDT for 4 counties in Iowa; Fillmore County, Houston County, Mower County, Minnesota; Crawford County, Vernon County, Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 19, 2017, 2:38 PM CDT (19:38 UTC)
Expired: Jul 19, 2017, 4:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 95%

Counties Allamakee County, IA, Chickasaw County, IA, Howard County, IA, Winneshiek County, IA, Fillmore County, MN, Houston County, MN, Mower County, MN, Crawford County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 64 km from the middle of the area, began a volume at 19:40 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.6 hours before the alert went out and 221 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: 147 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 1286 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 19, 12:11 PM CDT	Mesoscale Discussion	SPC	Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee, Chickasaw and 20 more	2 hr
Jul 19, 12:36 PM CDT	Severe Thunderstorm Watch	SPC	Bremer, Butler, Cerro Gordo, Clay, Dickinson, Emmet and 7 more	5 hr
Jul 19, 3:29 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more	6 hr
Jul 19, 4:52 PM CDT	Severe Thunderstorm Watch	SPC	Lyon, Plymouth, Sioux, Woodbury	6 hr
Jul 19, 5:11 PM CDT	Mesoscale Discussion	SPC	Buchanan, Clayton, Clinton, Delaware, Dubuque, Jackson and 1 more	34 min
Jul 19, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	Buchanan, Cedar, Clinton, Delaware, Dubuque, Jackson and 3 more	6 hr
Jul 19, 6:32 PM CDT	Mesoscale Discussion	SPC	Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more	58 min
Jul 19, 9:55 AM CDT	Mesoscale Discussion	SPC	Lincoln, Lyon, Pipestone, Yellow Medicine	2 hr
Jul 19, 9:59 AM CDT	Mesoscale Discussion	SPC	Kittson, Marshall, Pennington, Roseau	3 hr
Jul 19, 1:13 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Cottonwood, Jackson, Lincoln, Lyon and 5 more	92 min
Jul 19, 2:46 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Cottonwood, Faribault, Freeborn, Le Sueur and 5 more	89 min

Nearby

Mesoscale Discussions in Iowa, 2017 Mesoscale Discussions in Minnesota, 2017 Mesoscale Discussions in Wisconsin, 2017 Every mesoscale discussion in 2017

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.