Marine Weather and Tide Forecast for Chambersburg, PA

NEAR TERM /UNTIL 2 AM SUNDAY MORNING/
Convection has fallen apart on the whole. Have been canceling the flood watch as the threat ends in each area. Some storms still to the west near HLG/AFG, but should weaken as have most others as they get into our CWA The last bunch of counties in the watch go until 11 PM, and we'll likely leave them alone to run the course. The rainfall is expected to be generally light for the rest of the night and much of the morning Sunday. The sfc boundary is into MD, but a steep inversion overhead will keep moisture trapped under itself, and the easterly flow in llvls will reinforce/lower/thicken the current low clouds.
Expect patches of drizzle or spotty showers over the CWA through the night. The temps will only fall a few more degs through sunrise.

SHORT TERM /2 AM SUNDAY MORNING THROUGH MONDAY NIGHT/
An elevated frontal boundary will pivot to more of a NW - SE orientation for Sunday, and become more diffuse, which should lead to lower precip rates from less widespread showers.
Additional showers and thunderstorms will be possible Sunday afternoon and some of the storms will be capable of producing locally heavy rainfall. Most of those will be in the Laurel Highlands, but some could stray into the central mtns.

By Monday, high pressure off of the east coast may try to build westward into our area. This may keep the eastern half of our forecast area relatively dry, though easterly flow will keep plenty of low clouds around. Rain chances will stick around farther to the west.

LONG TERM /TUESDAY THROUGH SATURDAY/
There is a daily chc of showers/storms through much of next week, with the peak each day occurring during the afternoon/evening hours. However, the week ahead will not be a complete wash out, and there will be periods of dry weather mixed in.

The sfc flow will become more southerly on Tuesday and southwesterly by Wed, allowing for a warming trend through midweek. It will become fairly muggy as well, and heat indices could top 90 degrees across the Lower Susq Valley Wed and Thu aftn.

A cold front is progged to cross the region on Thursday, accompanied by a higher PoPs and a better chc of showers/storms. Decreasing PoPs and lower humidity are expected behind this front to end the week.

AVIATION /03Z SUNDAY THROUGH THURSDAY/
Widespread restrictions will continue overnight from low ceilings and reduced vsbys in fog. Periods of rain and thunderstorms will return late morning into Sunday afternoon.

Shower activity will diminish overnight. Low cigs will persist, however, while cooling temperatures and plentiful low-level moisture could lead to the development of fog tonight into early Sunday.

Conditions will be very slow to improve on Sunday, with IFR cigs persisting through at least midday areawide.

Outlook...

Mon-Wed...Daily chances for showers and thunderstorms, peaking during the afternoon/evening hours each day.

Thu...A better chc of more numerous showers and storms with a cold frontal passage.

CTP WATCHES/WARNINGS/ADVISORIES
Flood Watch until 11 PM EDT this evening for PAZ033>035.