Alert archive / Iowa / Mesoscale Discussions in 2023

Mesoscale Discussion 730

May 8, 20235 counties in Iowa; 5 counties in Minnesota; Pierce County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 8, 2023, 2:32 PM CDT for 5 counties in Iowa; 5 counties in Minnesota; Pierce County, Wisconsin. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
May 8, 2023, 2:32 PM CDT (19:32 UTC)
Expired
May 8, 2023, 4:00 PM CDT
In force
88 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch unlikely
Chance of a watch
5%

Counties Buchanan County, IA, Chickasaw County, IA, Fayette County, IA, Howard County, IA, Winneshiek County, IA, Fillmore County, MN, Goodhue County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Pierce County, WI

The radar

The La Crosse radar (KARX), 81 km from the middle of the area, began a volume at 19:32 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, 7.5 hours before the alert went out and 177 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2023-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2023-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
998 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
169 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.

IssuedProductOfficeCountiesLasted
May 7, 9:00 PM CDTMesoscale DiscussionSPCAdams, Clarke, Decatur, Fremont, Lucas, Madison and 6 more2 hr
May 8, 3:51 PM CDTMesoscale DiscussionSPCBuena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 21 more2 hr

Nearby

Mesoscale Discussions in Iowa, 2023Mesoscale Discussions in Minnesota, 2023Mesoscale Discussions in Wisconsin, 2023Every mesoscale discussion in 2023

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.