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Dense fog possible overnight in Clark County

The National Weather Service warned that clearing skies could bring patchy dense fog to the region overnight into Monday.

The National Weather Service warned Clark County residents that dense fog could develop overnight as skies cleared on October 11 NWS. The statement was in effect until midnight and said visibility could drop to one quarter mile or less in some spots NWS.

The LanternAI-drafted · Fact-checked Published Oct 12, 2026
Illustration: fog lying across fields and fence posts fading into the distance
Illustration · The Lantern

Where the fog could form

Forecasters said conditions for fog were becoming more favorable late in the evening and through the overnight hours, especially across eastern Indiana and western Ohio NWS. The statement noted that areas farther east into Ohio could see fog as well NWS. It covered a wide stretch of the region, including Clark, Champaign, Miami and Montgomery counties among others NWS.

1 source
How we know this:

This report is based on a special weather statement issued by the National Weather Service office in Wilmington, Ohio, at 7:36 p.m. on October 11, 2026, set to expire at midnight NWS.

Sources

1Special Weather Statement for Clark County — issued Oct 11, 7:36 p.m.NWS Alerts — Clark County, OH · Oct 11, 2026 · the filing on this pageweather.gov (opens the agency's page)

The source filing

EventSpecial Weather Statement
Message typeAlert
SeverityModerate
CertaintyObserved
UrgencyExpected
HeadlineSpecial Weather Statement issued October 11 at 7:36PM EDT by NWS Wilmington OH
Area descWayne; Fayette; Union; Franklin; Ripley; Dearborn; Ohio; Switzerland; Carroll; Gallatin; Boone; Kenton; Campbell; Owen; Grant; Pendleton; Bracken; Robertson; Mason; Hardin; Mercer; Auglaize; Darke; Shelby; Logan; Miami; Champaign; Clark; Preble; Montgomery; Greene; Butler; Warren; Clinton; Hamilton; Clermont; Brown
EffectiveOctober 11, 2026, 7:36 p.m.
ExpiresOctober 12, 2026
Sender nameNWS Wilmington OH
View the original at weather.gov

Published by National Weather Service (api.weather.gov). This is the agency's public filing as The Lantern received it, shown with its fields named in plain English.

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Dense fog possible overnight in Clark County — The Lantern · New Carlisle