Alert archive / Ohio / Flash Flood Warnings in 2026

Flash Flood Warning 90, NWS Wilmington, OH

September 17, 2026Auglaize County, Mercer County, Ohio

NWS Wilmington, OH issued this flash flood warning at Sep 17, 2026, 6:06 AM EDT for Auglaize County, Mercer 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
Sep 17, 2026, 6:06 AM EDT (10:06 UTC)
Expired
Sep 17, 2026, 10:44 AM EDT
In force
5 hr
Issued by
NWS Wilmington, OH
Area
Storm-based polygon
Flood severity
None

Counties Auglaize County, OH, Mercer County, OH

The radar

The Cincinnati radar (KILN), 136 km from the middle of the area, began a volume at 10:07 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 10.1 hours before the alert went out and 136 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, Cncnati-Daytn, OH at 00:00Z on 2026-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2381 joules per kilogram.LCLEL10008507005003002001001 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, Cncnati-Daytn, OH at 00:00Z on 2026-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
2381 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1181 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
95 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
Sep 16, 8:00 PM EDTAreal Flood AdvisoryILNMontgomery, Preble112 min
Sep 16, 9:45 PM EDTSpecial Weather StatementILNLicking30 min
Sep 16, 9:49 PM EDTSevere Thunderstorm WarningILNLicking26 min
Sep 17, 10:44 AM EDTAreal Flood WarningILNAuglaize, Mercer, Shelby21 hr
Sep 17, 1:37 PM EDTSpecial Weather StatementILNMontgomery23 min
Sep 17, 1:41 PM EDTSevere Thunderstorm WarningILNGreene, Montgomery34 min
Sep 17, 1:53 PM EDTFlood WatchILNAdams, Brown, Butler, Clark, Clermont, Clinton and 17 more18 hr
Sep 17, 2:52 PM EDTSpecial Weather StatementILNHocking, Pickaway38 min
Sep 17, 3:34 PM EDTSpecial Weather StatementILNHocking26 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.