Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 14, NWS La Crosse, WI

May 19, 2024Floyd County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at May 19, 2024, 11:33 PM CDT for Floyd County, Iowa. It was in force for 27 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 19, 2024, 11:33 PM CDT (04:33 UTC)
Expired: May 20, 2024, 12:00 AM CDT
In force: 27 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Floyd County, IA

The radar

The La Crosse radar (KARX), 154 km from the middle of the area, began a volume at 04:35 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, 4.6 hours before the alert went out and 247 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: 65 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 2316 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 La Crosse, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at May 19, 10:35 PM CDT, 58 minutes earlier.

Area forecast discussion, May 19, 10:35 PM CDT, 58 minutes before

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Hazardous weather outlook, May 19, 5:37 PM CDT, 5 hours 56 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:44 AM CDT	Special Weather Statement	ARX	Grant	46 min
May 20, 6:30 PM CDT	Special Weather Statement	ARX	Olmsted	60 min
May 20, 6:32 PM CDT	Tornado Warning Tornado observed	ARX	Dodge	43 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.