Alert archive / Wisconsin / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 330

June 22, 20158 counties in Iowa; 7 counties in Minnesota; 16 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2015, 6:03 AM CDT for 8 counties in Iowa; 7 counties in Minnesota; 16 counties in Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jun 22, 2015, 6:03 AM CDT (11:03 UTC)
Expired: Jun 22, 2015, 10:00 AM CDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 31 counties

Allamakee 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, Chippewa County, WI, Clark County, WI, Crawford County, WI, Dunn County, WI, Eau Claire County, WI, Grant County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Richland County, WI, Saint Croix County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 82 km from the middle of the area, began a volume at 11:03 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 60%

Warnings issued inside it

10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 22, 6:28 AM CDT	Flash Flood Warning	ARX	Mower	4 hr
Jun 22, 6:33 AM CDT	Severe Thunderstorm Warning	ARX	Mitchell	42 min
Jun 22, 6:42 AM CDT	Severe Thunderstorm Warning	ARX	Dodge, Fillmore, Mower, Olmsted	50 min
Jun 22, 6:46 AM CDT	Severe Thunderstorm Warning	ARX	Howard, Winneshiek	59 min
Jun 22, 6:54 AM CDT	Severe Thunderstorm Warning	ARX	Clayton	66 min
Jun 22, 6:55 AM CDT	Flash Flood Warning	ARX	Howard, Mitchell	4 hr
Jun 22, 7:58 AM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton, Fayette	62 min
Jun 22, 8:15 AM CDT	Flash Flood Warning	ARX	Allamakee, Clayton, Winneshiek	3 hr
Jun 22, 8:27 AM CDT	Severe Thunderstorm Warning	ARX	Crawford	33 min
Jun 22, 8:40 AM CDT	Severe Thunderstorm Warning	ARX	Clayton	50 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.1 hours before the alert went out and 142 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: 10 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 2425 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 2:25 AM CDT	Severe Thunderstorm Watch	SPC	Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux	6 hr
Jun 22, 3:10 AM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 16 more	95 min
Jun 22, 4:53 AM CDT	Mesoscale Discussion	SPC	Allamakee, Cerro Gordo, Chickasaw, Clay, Clayton, Dickinson and 15 more	2 hr
Jun 22, 5:33 AM CDT	Severe Thunderstorm Watch	SPC	Black Hawk, Boone, Bremer, Butler, Cerro Gordo, Emmet and 15 more	6 hr
Jun 22, 7:42 AM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 36 more	93 min
Jun 22, 8:08 AM CDT	Severe Thunderstorm Watch	SPC	Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 5 more	4 hr
Jun 22, 9:39 AM CDT	Severe Thunderstorm Watch	SPC	Muscatine, Scott	3 hr
Jun 22, 1:22 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Boone and 42 more	113 min
Jun 22, 3:56 PM CDT	Tornado Watch	SPC	Appanoose, Benton, Cedar, Clinton, Davis, Des Moines and 23 more	9 hr
Jun 22, 6:08 PM CDT	Mesoscale Discussion	SPC	Appanoose, Cedar, Davis, Des Moines, Henry, Iowa and 17 more	67 min
Jun 21, 10:41 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Big Stone, Clay, Grant, Norman, Otter Tail and 3 more	6 hr
Jun 21, 11:25 PM CDT	Mesoscale Discussion	SPC	Becker, Big Stone, Clay, Douglas, Grant, Otter Tail and 5 more	95 min
Jun 22, 1:17 AM CDT	Mesoscale Discussion	SPC	Big Stone, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 32 more	58 min
Jun 22, 3:16 AM CDT	Mesoscale Discussion	SPC	Big Stone, Grant, Lac qui Parle, Lincoln, Pipestone, Rock and 1 more	89 min
Jun 22, 2:50 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Carlton, Carver, Chisago and 10 more	55 min
Jun 22, 9:14 AM CDT	Mesoscale Discussion	SPC	Dodge, Jefferson, Kenosha, Milwaukee, Racine, Rock and 3 more	61 min
Jun 22, 11:00 AM CDT	Mesoscale Discussion	SPC	Kenosha, Milwaukee, Racine, Walworth, Waukesha	2 hr
Jun 22, 4:48 PM CDT	Severe Thunderstorm Watch	SPC	Ashland, Bayfield, Burnett, Douglas, Florence, Forest and 7 more	4 hr

Nearby

Severe Thunderstorm Watches in Wisconsin, 2015 Severe Thunderstorm Watches in Iowa, 2015 Severe Thunderstorm Watches in Minnesota, 2015 Every severe thunderstorm watch 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.