Central Appalachia Weather Authority

10/10/2026

10/06/2026

A cold overnight led to some frost near Ligonier, PA. Leave us a comment, and let us know if you got frost this morning. Feel free to attach a photo as well!



Photo Credit: Troy Wilson

10/05/2026

A Frost Advisory has been issued for Tuesday morning. Be sure to take steps to protect any sensitive outdoor vegetation. Temperatures are expected to be in the mid to upper 30s within the advisory area.

09/25/2026

Frost Possible Across Portions of The Central Appalachians Overnight!!!

As of Thursday evening, temperatures are rapidly falling across the region. Clear skies, light winds, and dry air is creating an optimal environment for radiational cooling. This will especially be the case in sheltered valleys, where some pockets of frost will be possible by Friday morning. The highlighted area represents the locations where pockets of frost will be possible overnight. Areas that are not highlighted are unlikely to see frost at this time. The National Weather Service has issued Frost Advisories for some counties from eastern West Virginia through northern Pennsylvania.

09/24/2026

Frost Possible In The Sheltered Valleys of The Central Appalachians On Friday Morning!!!

Weather Update:

An area of low pressure will develop and intensify off the East Coast late this week. Counterclockwise flow around the strengthening cyclone will help to filter dry Canadian air into the region late this week. After a sunny, cool day on Thursday, a chilly night will unfold across the region. Clear skies, light winds, and low dew points will allow temperatures to drop off quickly after sunset. While widespread frost formation is not expected, some of the colder, sheltered valleys from eastern West Virginia through southern New York will have the potential to see some patchy frost early Friday morning. It is possible that some cloud cover may push into southern New York and northern Pennsylvania overnight, limiting the risk of frost in this area. Otherwise, the risk of isolated frost is expected in the highlighted area.

09/22/2026

Fall-Like Weather Pattern Expected Across The Central Appalachians Through The Weekend!!!

Weather Highlights:

* Fall-Like Weather This Week
* Heavy Rain Possible Through Wednesday
* Sunny days and cool nights Thursday through Sunday
* Frost risk possible, especially in the colder valleys late this week

Weather Update:

The official start to fall begins on Tuesday, and it will certainly feel like fall across the region. A frontal boundary will continue to meander through the region over the next couple of days. This frontal boundary will continue to produce a damp, chilly air mass across our area. A low-pressure system is expected to close off over the Ohio Valley and will provide persistent rain chances across much of the region through mid-week. Conditions will improve late in the week, as the system moves toward the Eastern Seaboard.

Much drier air will filter in behind this system, setting the stage for a beautiful fall weekend. Sunny days and chilly nights can be expected across the region Thursday through Sunday. The dry air and clear nights will likely provide optimal conditions for radiational cooling. It is possible that a frost risk may materialize late this week.

09/18/2026

Weekend Weather Forecast For The Central Appalachians!!!

Summary:

The weekend will start off on a quiet and comfortable note for much of our region, but a frontal boundary will bring the risk of heavy rainfall and flash flooding from Saturday night into Sunday.

Friday:

A frontal boundary positioned from Central Ohio to northern Pennsylvania will gradually sink southward through the day. This will allow dew points to drop in northern portions of the area by late in the day, while southern regions will likely remain muggy. There will also be the chance for scattered showers or thunderstorms for mainly areas south and east of Pittsburgh this afternoon and evening.

Saturday:

The frontal boundary will stall out form the Midwest to the Mid-Atlantic region Saturday morning before returning northeastward as a warm front on Saturday. This will lead to an increase in dew points during the day, especially for areas south and west of Pittsburgh. Most other areas will experience a dry comfortable day before low-level moisture returns across much of the region Saturday night.

Sunday:

The frontal boundary will once again slow down or stall Sunday across northern Ohio and northern Pennsylvania on Sunday before returning south late in the day. A high amount of atmospheric moisture will be in place along and south of the boundary, setting the stage for the potential of heavy rainfall and flash flooding across the region. While the greatest risk may be in the highlighted area, all locations across our area should remain alert for the possibility of flash flooding.

09/18/2026

Dry Air Intrusion Across The Central Appalachians!!!

A push of dry air will occur across much of the Central Appalachian region Friday into Friday night. The frontal boundary responsible for the dry air will begin to push back to the north late in the day on Saturday, bringing the return of moist air for the rest of the weekend.

We will provide a more detailed update on the weekend forecast on Friday morning.

09/16/2026

Heavy Rain And Flash Flooding Risk For Portions of the Eastern Great Lakes And Central Appalachians Through Tonight!!!

Weather Summary:

After a couple of dry, comfortable days, air and dewpoint temperatures have risen once again across our region. A frontal boundary located across the Great Lakes into the Northeast will remain nearly stationary from this afternoon through the overnight hours, leading to a corridor of enhanced thunderstorm risk along and south of the boundary.

It appears that a corridor from northern Ohio through northern Pennsylvania and southern New York will have the potential to experience heavy rain and flash flooding with thunderstorms that develop this afternoon through tonight. There is a high level of precipitable water content in the atmosphere, which means that storms will be efficient rainfall producers.

While areas further south will have plenty of moisture in place, these areas will not have the lift necessary for thunderstorm development, due to greater distance from the frontal boundary.

09/15/2026

Chilly Night Expected Across the Central Appalachians And Northeast!!!

Summary:

A dry, fall-like air mass that settled into the region on Monday will lead to a chilly night across the region. With light winds and low dew points in place, radiational cooling will allow temperatures to drop quickly after sunset. Many rural areas in Pennsylvania, northeastern West Virginia, western Maryland, and southern New York will see temperatures dip into the 40s by Tuesday morning. It is possible that a few of the typically colder valleys in northern Pennsylvania and southern New York could see lows in the upper 30s; however, frost does not appear to be an issue at this time.