Low pressure tracking up the Appalachians combined with a strong arctic cold front to produce a significant rain and snow producing storm for the region. Ahead of the front, a strong southwesterly moisture feed and mid-level short wave brought heavy rainfall to the area, with 2 to 3 inch storm total rainfall reports common. This rain created strong rises on area rivers and streams, with several gauging points reaching flood stage. Also, the strong river rises broke up ice on these waterways, creating significant ice jam concerns.
The strong arctic cold front passed through during the afternoon and evening of the 12th, bringing a flash freeze to area roads that were wet and water-covered from the rain. A mix of sleet and freezing rain developed during the evening with minor ice accretion reported. Precipitation then changed to all snow and continued into the morning of the 13th before tapering to snow showers. A swath of 6-8 inches of snow fell from southeast Ohio, across the northern WV panhandle into portions of southwest Pennsylvania, with lesser totals in the Laurel Highlands and southeastern ridges.

Winter Storm in BUTLER, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in CLARION, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in FOREST, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in WASHINGTON, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Weather in WESTMORELAND, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Weather in WESTMORELAND RIDGES, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Weather in FAYETTE RIDGES, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Weather in INDIANA, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Flood in WESTMORELAND, PENNSYLVANIA
From 12-JAN-18 05:03:00 to 12-JAN-18 09:00:00 (EST-5)
Location: ARNOLA
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement and 911 reported that Stevenson Blvd, Milligantown Road were flooded. In addition, there was residential flooding reported at Wells Ave.

Flood in ARMSTRONG, PENNSYLVANIA
From 12-JAN-18 06:34:00 to 12-JAN-18 09:34:00 (EST-5)
Location: IRON BRIDGE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

State official reported that Iron Bridge Road was flooded in South Buffalo Township.

Flood in ARMSTRONG, PENNSYLVANIA
From 12-JAN-18 13:30:00 to 12-JAN-18 17:30:00 (EST-5)
Location: HILLVILLE
Flood cause: Ice Jam
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported flooding along the Allegheny River as a result of ice jam flooding. Trained spotter also noted that homes in the Seybertown area were being flooded.

Flood in CLARION, PENNSYLVANIA
From 12-JAN-18 07:32:00 to 12-JAN-18 14:30:00 (EST-5)
Location: MILL CREEK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

State official reported many flooded roadways across the county.

Flood in GREENE, PENNSYLVANIA
From 12-JAN-18 05:30:00 to 12-JAN-18 14:30:00 (EST-5)
Location: HUNTERS CAVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported that Ten Mile Creek was out of its banks with several roadways flooded around Sycamore. In addition, a male was stuck in in his vehicle due to flooding on the west side of Rogersville. State Route 21 was flooded in several locations.

Flood in ALLEGHENY, PENNSYLVANIA
From 12-JAN-18 02:57:00 to 12-JAN-18 16:30:00 (EST-5)
Location: CLIFTON
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

State officials and local law enforcement reported several roads closed across much of southwestern Allegheny county. This included Route 51 in Brentwood and Baldwin, Baldwin Road in West Homestead, and Lebanon Church Road in West Mifflin. In addition, Chartiers Creek was out of it's banks flooding South Fayette Road in Bridgeville and Boyce and Mayview Roads in Upper Saint Clair. Evacuations were taking place at the 100 block of Blythe Road in Bridgeville.

Flood in ARMSTRONG, PENNSYLVANIA
From 12-JAN-18 06:16:00 to 12-JAN-18 15:00:00 (EST-5)
Location: CRAIGSVILLE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

State official reported that Yellow Dog Road was closed due to flooding. In addition, a water rescue was reported on Nichola Road with male trapped on roof of vehicle.

Flood in ALLEGHENY, PENNSYLVANIA
From 12-JAN-18 01:22:00 to 12-JAN-18 16:30:00 (EST-5)
Location: OAKDALE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management and local law enforcement reported several roads closed around Oakdale.

Flood in ALLEGHENY, PENNSYLVANIA
From 12-JAN-18 03:10:00 to 12-JAN-18 14:10:00 (EST-5)
Location: ELFINWILD
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported several roads closed due to flooding including Route 8 southbound.

Winter Storm in ALLEGHENY, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in BEAVER, PENNSYLVANIA
From 12-JAN-18 17:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in MERCER, PENNSYLVANIA
From 12-JAN-18 16:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in LAWRENCE, PENNSYLVANIA
From 12-JAN-18 16:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Weather in FAYETTE, PENNSYLVANIA
From 12-JAN-18 18:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Weather in GREENE, PENNSYLVANIA
From 12-JAN-18 18:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Flood in ALLEGHENY, PENNSYLVANIA
From 12-JAN-18 04:11:00 to 12-JAN-18 14:29:00 (EST-5)
Location: ACMETONIA
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Public reported that Jacoby Road was flooded by water from Little Deer Creek.

Flood in ALLEGHENY, PENNSYLVANIA
From 12-JAN-18 05:36:00 to 12-JAN-18 14:30:00 (EST-5)
Location: SEWICKLEY
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported that Big Sewickley Creek and Little Sewickley Creek were out of their banks. Cadas lane was flooded.

Winter Storm in VENANGO, PENNSYLVANIA
From 12-JAN-18 16:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in ARMSTRONG, PENNSYLVANIA
From 12-JAN-18 16:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in JEFFERSON, PENNSYLVANIA
From 12-JAN-18 16:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Flood in ALLEGHENY, PENNSYLVANIA
From 12-JAN-18 04:50:00 to 12-JAN-18 14:30:00 (EST-5)
Location: HIGHCLIFF
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media reported that Rochester Road between Route 19 and 6th Avenue was closed due to flooding.

Flood in JEFFERSON, PENNSYLVANIA
From 12-JAN-18 07:43:00 to 12-JAN-18 14:30:00 (EST-5)
Location: BAXTER
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

State official reported flooding in Cool Spring. A water rescue was performed to get an elderly couple out of home. In addition, the upper part of Morean Road was washed out in the Clover Township.

Flood in JEFFERSON, PENNSYLVANIA
From 12-JAN-18 10:19:00 to 12-JAN-18 14:30:00 (EST-5)
Location: BAXTER
Flood cause: Ice Jam
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported an ice jam on Redbank Creek.

Flood in JEFFERSON, PENNSYLVANIA
From 12-JAN-18 14:50:00 to 13-JAN-18 10:00:00 (EST-5)
Location: KAHLETOWN
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Local Park Service reported that the Clarion river is flooding the Clarion River is flooding River Road and State Route 36.

Flood in BEAVER, PENNSYLVANIA
From 12-JAN-18 18:36:00 to 13-JAN-18 12:00:00 (EST-5)
Location: FOMBELL
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

State official reported flooding at Pullman Station and in Koppel and Fombell due to rising waters from Conoquenessing Creek.

Flood in WASHINGTON, PENNSYLVANIA
From 12-JAN-18 02:18:00 to 12-JAN-18 17:00:00 (EST-5)
Location: WASHINGTON
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported flooded roads in and south of Washington. In addition, eight to nine residents needed to be evacuated along Tarbuck Lane as water was rising to just below the first floor of mobile homes.

Flood in WASHINGTON, PENNSYLVANIA
From 12-JAN-18 03:06:00 to 12-JAN-18 16:00:00 (EST-5)
Location: STRABANE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported roads closed due to flooding including the 400 block of Western Ave from Chartiers Creek. In addition, local media reported that Linden Creek Road and Washington Road were closed due to Linden Creek being out of its banks.

Flood in WASHINGTON, PENNSYLVANIA
From 12-JAN-18 03:06:00 to 12-JAN-18 14:00:00 (EST-5)
Location: VENICE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported roads closed due to flooding.

Flood in WASHINGTON, PENNSYLVANIA
From 12-JAN-18 04:29:00 to 12-JAN-18 14:30:00 (EST-5)
Location: MC DONALD
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported Millers Run road and Reed Street closed due to flooding.

Flood in WASHINGTON, PENNSYLVANIA
From 12-JAN-18 07:29:00 to 12-JAN-18 14:30:00 (EST-5)
Location: COAL BLUFF
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

State official reported that a person was rescued on Finleyville Elrama Road in Union Township.