Alert archive / Ohio / Flash Flood Warnings in 2026

Flash Flood Warning 33, NWS Wilmington, OH

July 17, 2026Clermont County, Hamilton County, Ohio

NWS Wilmington, OH issued this flash flood warning at Jul 17, 2026, 5:56 PM EDT for Clermont County, Hamilton County, Ohio. It was in force for 5 hr. 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 17, 2026, 5:56 PM EDT (21:56 UTC)
Expired
Jul 17, 2026, 11:23 PM EDT
In force
5 hr
Issued by
NWS Wilmington, OH
Area
Storm-based polygon
Flood severity
None

Counties Clermont County, OH, Hamilton County, OH

The radar

The Cincinnati radar (KILN), 56 km from the middle of the area, began a volume at 21:59 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

Lincoln, IL (KILX), launched 12:00Z, 9.9 hours before the alert went out and 382 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, Lincoln, IL at 12:00Z on 2026-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1235 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, Lincoln, IL at 12:00Z on 2026-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.1939Sfc1 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
1235 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
875 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Wilmington, OH issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 17, 4:28 PM EDTAreal Flood AdvisoryILNButler, Clermont, Hamilton, Warren3 hr
Jul 17, 4:42 PM EDTFlash Flood WarningILNClermont, Hamilton, Warren3 hr
Jul 17, 4:55 PM EDTSpecial Weather StatementILNRoss35 min
Jul 17, 5:11 PM EDTSpecial Weather StatementILNMontgomery34 min
Jul 17, 5:18 PM EDTAreal Flood AdvisoryILNHamilton12 min
Jul 17, 5:19 PM EDTSpecial Weather StatementILNHardin26 min
Jul 17, 5:30 PM EDTFlash Flood WarningILNHamilton9 hr
Jul 17, 5:46 PM EDTSpecial Weather StatementILNHardin29 min
Jul 17, 6:31 PM EDTAreal Flood AdvisoryILNClermont2 hr
Jul 17, 6:49 PM EDTSpecial Weather StatementILNPickaway26 min
Jul 17, 7:14 PM EDTAreal Flood AdvisoryILNMadison2 hr
Jul 17, 7:30 PM EDTAreal Flood WarningILNClermont, Hamilton, Warren7 hr
Jul 17, 7:32 PM EDTSpecial Weather StatementILNLicking28 min
Jul 17, 2:43 PM EDTSpecial Weather StatementILNMason32 min
Jul 17, 4:49 PM EDTSpecial Weather StatementILNRobertson26 min
Jul 17, 5:08 PM EDTSpecial Weather StatementILNBracken, Mason, Robertson37 min
Jul 17, 5:21 PM EDTAreal Flood AdvisoryILNRobertson114 min
Jul 17, 7:41 PM EDTSpecial Weather StatementILNRipley34 min

Nearby

Flash Flood Warnings in Ohio, 2026Every flash flood 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.