Alert archive / Iowa / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 163, NWS La Crosse, WI

July 20, 2026Floyd County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 20, 2026, 2:53 PM CDT for Floyd County, Iowa. It was in force for 52 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
Jul 20, 2026, 2:53 PM CDT (19:53 UTC)
Expired
Jul 20, 2026, 3:45 PM CDT
In force
52 min
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Floyd County, IA

The radar

The La Crosse radar (KARX), 154 km from the middle of the area, began a volume at 19:56 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, 7.9 hours before the alert went out and 209 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 2026-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 982 joules per kilogram.LCLLFCEL10008507005003002001001 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 2026-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 299 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
982 J/kg
Mixed-layer CIN
-242 J/kg
Mixed-layer LCL
1013 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
299 m²/s²
0-3 km storm-relative helicity
288 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

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 Jul 20, 12:42 PM CDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jul 20, 12:42 PM CDT, 2 hours 11 minutes before
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Hazardous weather outlook, Jul 20, 4:30 AM CDT, 10 hours 23 minutes before
Hazardous Weather Outlook
National Weather Service La Crosse WI
430 AM CDT Mon Jul 20 2026

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-211000-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-
Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-
Adams-Vernon-Crawford-Richland-Grant-
430 AM CDT Mon Jul 20 2026

This Hazardous Weather Outlook is for portions of southeast
Minnesota...northeast Iowa and southwest into central Wisconsin.

.DAY ONE...Today and Tonight

Air Quality Alerts remain in effect through the morning hours for
unhealthy air quality due to wildfire smoke.

Strong to severe storms are possible through the afternoon into
tonight with damaging winds, large hail, and a few tornadoes
possible.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Severe reports are appreciated.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 4:49 AM CDTSpecial Weather StatementARXBuffalo, Trempealeau56 min
Jul 20, 3:01 PM CDTSpecial Weather StatementARXVernon29 min
Jul 20, 3:37 PM CDTSpecial Weather StatementARXCrawford23 min
Jul 20, 4:18 PM CDTSpecial Weather StatementARXGrant27 min
Jul 20, 5:54 AM CDTSpecial Weather StatementARXChickasaw, Floyd, Howard, Mitchell, Winneshiek66 min
Jul 20, 7:06 AM CDTSevere Thunderstorm WarningARXMitchell34 min
Jul 20, 7:42 AM CDTSpecial Weather StatementARXChickasaw, Floyd, Howard, Mitchell63 min
Jul 20, 8:34 AM CDTSpecial Weather StatementARXChickasaw, Winneshiek26 min
Jul 20, 10:34 AM CDTHeat AdvisoryARXChickasaw, Floyd, Howard, Mitchell8 hr
Jul 20, 6:18 AM CDTSpecial Weather StatementARXDodge, Mower57 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2026Every severe thunderstorm warning in 2026

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.