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

Updated: 4:00 am EDT Aug 19, 2026

Today Partly Sunny then Slight Chance Showers And T-Storms Thursday Rain Showers Likely then Slight Chance Showers And T-Storms Friday Sunny Saturday Mostly Sunny then Chance Showers And T-Storms Sunday Mostly Sunny then Slight Chance Showers And T-Storms Monday Sunny Tuesday Mostly Sunny   Hi 78 °F Hi 78 °F Hi 79 °F Hi 79 °F Hi 76 °F Hi 76 °F Hi 78 °F     Tonight Slight Chance Showers And T-Storms then Showers And T-Storms Likely Thursday Night Mostly Clear Friday Night Mostly Clear Saturday Night Chance Showers And T-Storms Sunday Night Slight Chance Showers And T-Storms then Mostly Clear Monday Night Mostly Clear Tuesday Night Partly Cloudy   Lo 63 °F Lo 59 °F Lo 60 °F Lo 60 °F Lo 57 °F Lo 58 °F Lo 60 °F

Forecast from NOAA-NWS for Lancaster, OH.

556
FXUS61 KILN 190709
AFDILN

Area Forecast Discussion
National Weather Service Wilmington OH
309 AM EDT Wed Aug 19 2026

.WHAT HAS CHANGED...
Increased potential for locally heavy rain late this afternoon into
tonight.

&&

.KEY MESSAGES...
1) Showers and thunderstorms will develop into the area later this
afternoon and continue through tonight as low pressure and a cold
front move across the area. Locally heavy rain is possible.

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

&&

.DISCUSSION...
KEY MESSAGE 1)
Weak impulses moving through the base of a trough will cross the
area today into this evening before a more energetic short wave
passes late tonight into Thursday morning. This will induce a low
along an approaching front.

The cold front will remain north of the area until late afternoon
and then sag into the area this evening. Some scattered showers and
thunderstorms may occur this afternoon in the warm sector. More
robust convection is forecast to occur near the front and ahead of
the low as the nose of a low level jet pushes into the region.
Precipitable water will increase to around 1.7 to 1.8 inches and the
warm cloud layer will be deepening which will lead to efficient
rainfall producing storms. Given the alignment of the convection
along the boundary, there may be persistent or repeated heavy
rainfall in a west-east axis. High resolution models are now showing
a more pronounced stripe of higher QPF somewhere near the I-70
corridor.

As the low moves through, the trailing front will be aligned more
northeast to southwest. And while showers and storms along this
portion of the boundary may still produce heavy rain, this activity
will be much more transient and thus any higher rainfall totals will
be rather localized. All activity will pass off to the east towards
daybreak Thursday.


KEY MESSAGE 2)
Short wave digging into a mean trough from the Great Lakes into the
southern Appalachians will move into the area on Saturday. This will
bring the next cold front. Guidance is in fairly good agreement that
it will come through during Saturday afternoon and evening. There is
some potential for stronger storms out ahead of this front.

&&

.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
There could be some visibility restrictions in shallow fog at KLUK
during the early part of the period. Otherwise, VFR will prevail
outside of any showers and thunderstorms. Some mid clouds are moving
across the area to start. They will move off towards daybreak. A VFR
ceiling will spread across the area after 18Z. Some showers and
thunderstorms could occur near KDAY to KCMH/KLCK between 20Z and 00Z
with a better chance after 02Z.

OUTLOOK...Thunderstorms possible late tonight and Saturday
afternoon. MVFR to IFR ceilings and visibilities possible late
tonight into Thursday.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...None.
KY...None.
IN...None.

&&

$$

DISCUSSION...35
AVIATION...35

NWS ILN Office Area Forecast Discussion