Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 57, NWS Milwaukee, WI

May 21, 2024Iowa County, Lafayette County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at May 21, 2024, 3:57 PM CDT for Iowa County, Lafayette County, Wisconsin. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 21, 2024, 3:57 PM CDT (20:57 UTC)
Expired: May 21, 2024, 4:46 PM CDT
In force: 49 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 60.0 mph

Counties Iowa County, WI, Lafayette County, WI

The radar

The Milwaukee radar (KMKX), 130 km from the middle of the area, began a volume at 20:59 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 12:00Z, 9.0 hours before the alert went out and 138 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: 1292 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1074 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Milwaukee, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at May 21, 3:14 PM CDT, 43 minutes earlier.

Area forecast discussion, May 21, 3:14 PM CDT, 43 minutes before

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Hazardous weather outlook, May 21, 2:29 PM CDT, 1 hour 28 minutes before

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In the hours before

Local storm report, May 21, 1:14 PM CDT, 2 hours 43 minutes before

Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
114 PM CDT Tue May 21 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1248 PM     Hail             3 NNE Stoughton         42.96N 89.21W
05/21/2024  M1.00 Inch       Dane               WI   Public

            Hail at least 1 inch in diameter via social
            media video.

&&

DDV

Local storm report, May 21, 1:32 PM CDT, 2 hours 25 minutes before

Preliminary Local Storm Report
National Weather Service Milwaukee/Sullivan WI
132 PM CDT Tue May 21 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1243 PM     Hail             1 NNW Stoughton         42.93N 89.23W
05/21/2024  E1.50 Inch       Dane               WI   Public

            Size estimated from social media pic. Time
            estimated from radar.

&&

DDV

The office that day

Everything else NWS Milwaukee, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 9:15 PM CDT	Small Craft Advisory	MKX		24 hr
May 20, 11:44 PM CDT	Dense Fog Advisory	MKX	Columbia, Dane, Dodge, Fond du Lac, Green Lake, Jefferson and 10 more	10 hr
May 21, 4:09 AM CDT	Marine Dense Fog Advisory	MKX		15 hr
May 21, 12:43 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Dodge, Jefferson	28 min
May 21, 4:45 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	30 min
May 21, 4:54 PM CDT	Special Weather Statement	MKX	Iowa	36 min
May 21, 6:03 PM CDT	Severe Thunderstorm Warning	MKX	Iowa, Lafayette	42 min
May 21, 6:27 PM CDT	Severe Thunderstorm Warning	MKX	Iowa, Lafayette	48 min
May 21, 6:28 PM CDT	Severe Thunderstorm Warning	MKX	Sauk	47 min
May 21, 6:47 PM CDT	Severe Thunderstorm Warning	MKX	Iowa, Lafayette	58 min
May 21, 6:48 PM CDT	Tornado Warning	MKX	Columbia, Dane, Iowa, Sauk	27 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2024 Every severe thunderstorm warning in 2024

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.