Alert archive / Iowa / Mesoscale Discussions in 2022

Mesoscale Discussion 705

May 9, 202214 counties in Iowa; Crawford County, Richland County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 9, 2022, 9:05 PM CDT for 14 counties in Iowa; Crawford County, Richland County, Wisconsin. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: May 9, 2022, 9:05 PM CDT (02:05 UTC)
Expired: May 9, 2022, 10:30 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 195

Counties Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Fayette County, IA, Grundy County, IA, Linn County, IA, Marshall County, IA, Tama County, IA, Winneshiek County, IA, Crawford County, WI, Richland County, WI

The radar

The La Crosse radar (KARX), 152 km from the middle of the area, began a volume at 02:06 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

Davenport, (KDVN), launched 00:00Z, 2.1 hours before the alert went out and 161 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: 997 J/kg
Mixed-layer CIN: -366 J/kg
Mixed-layer LCL: 1613 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 9, 7:36 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 17 more	5 hr
May 9, 9:44 PM CDT	Mesoscale Discussion	SPC	Adams, Appanoose, Cedar, Clarke, Decatur, Iowa and 18 more	91 min
May 9, 11:07 PM CDT	Mesoscale Discussion	SPC	Clayton	113 min
May 9, 7:48 PM CDT	Mesoscale Discussion	SPC	Buffalo, Chippewa, Clark, Dunn, Eau Claire, Jackson and 10 more	87 min
May 9, 8:17 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Jackson, La Crosse, Monroe, Richland and 2 more	5 hr
May 10, 12:45 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Columbia, Crawford, Dane and 26 more	3 hr
May 10, 2:19 PM CDT	Tornado Watch	SPC	Adams, Brown, Calumet, Clark, Columbia, Crawford and 37 more	7 hr
May 10, 6:45 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Clark, Columbia, Dodge and 24 more	90 min

Nearby

Mesoscale Discussions in Iowa, 2022 Mesoscale Discussions in Wisconsin, 2022 Every mesoscale discussion in 2022

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.