National Weather Service Forecast for: Lancaster, OH Issued by: National Weather Service Wilmington, OH

Updated: 4:00 am EDT Aug 20, 2026

Today Showers And T-Storms then Chance Showers And T-Storms Friday Sunny Saturday Showers And T-Storms Likely Sunday Sunny Monday Sunny Tuesday Sunny Wednesday Slight Chance Rain Showers then Slight Chance Showers And T-Storms   Hi 78 °F Hi 80 °F Hi 79 °F Hi 75 °F Hi 75 °F Hi 77 °F Hi 80 °F     Tonight Slight Chance Showers And T-Storms then Partly Cloudy Friday Night Mostly Clear Saturday Night Showers And T-Storms Likely then Partly Cloudy Sunday Night Mostly Clear Monday Night Mostly Clear Tuesday Night Partly Cloudy Wednesday Night Slight Chance Showers And T-Storms   Lo 62 °F Lo 62 °F Lo 59 °F Lo 56 °F Lo 56 °F Lo 59 °F Lo 62 °F

Flash Flood Warning
Flood Watch
 

Forecast from NOAA-NWS for Lancaster, OH.

742
FXUS61 KILN 200634
AFDILN

Area Forecast Discussion
National Weather Service Wilmington OH
234 AM EDT Thu Aug 20 2026

.WHAT HAS CHANGED...
No significant changes.

&&

.KEY MESSAGES...
1) Showers and embedded thunderstorms across the area will move off
to the east this morning. Locally heavy rain remains possible.

2) Additional storms are expected on Saturday with another cold
front sweeping through.

&&

.DISCUSSION...
KEY MESSAGE 1)
Showers will a few embedded thunderstorms continue to move across the
area. While more robust activity is generally progressive, it has
also been quite proficient given warm rain processes in a very moist
environment. Most of these showers and storms will be passing east of
the forecast area towards daybreak. Flood watch continues. Cannot
rule out a few spotty showers developing this afternoon.

KEY MESSAGE 2)
Mid level trough extending from Hudson Bay to the southern
Appalachians will become deeper as a substantial short wave drops
through the Great Lakes into the upper Ohio Valley on Saturday. This
will push a cold front through the area Saturday afternoon and
evening. Atmosphere is forecast to become moderately unstable, but
better shear is lagging the instability. If this remains the case,
then storm organization will be limited.

&&

.AVIATION /06Z THURSDAY THROUGH MONDAY/...
Showers and embedded thunderstorms will continue to move across the
region for the early part of the period. This will bring temporary
lower conditions. While not a certainty, it does appears that
moistening low levels will result in MVFR ceiling developing for a
period of time after 12Z. Expect lower clouds to diminish towards
18Z but a VFR deck will remain. These clouds will decrease towards
00Z.

OUTLOOK...MVFR to IFR ceilings and visibilities possible late tonight
into Friday morning. Thunderstorms possible Saturday afternoon and
evening.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...Flood Watch until 10 AM EDT this morning for OHZ026-034-035-042>046-
     051>056-060>065-074.
KY...None.
IN...Flood Watch until 10 AM EDT this morning for INZ050-058-059.

&&

$$

DISCUSSION...35
AVIATION...35

NWS ILN Office Area Forecast Discussion