Extreme cold arctic air surged into the northeast region January 30th. 500mb heights were close to 5040 meters, 850mb temperatures ranged from -26 to -30 degrees Celsius, and 925mb temperatures were near -22 to -26 degrees Celsius. With the quick drop in temperature in the boundary layer, a steep low level lapse rate was created near the surface. Due to this steep lapse rate, winds near 850mb to 925mb (averaging 20kts) were capable of reaching the surface and created wind chill temperatures of -22F and lower.

Extreme Cold/Wind Chill in ALLEGHENY, PENNSYLVANIA
From 30-JAN-19 10:35:00 to 30-JAN-19 10:35:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -26.0 F was measured at Wexford, PA on Jan 30th. Pittsburgh International Airport measured a wind chill of -21.0 F.

Extreme Cold/Wind Chill in BEAVER, PENNSYLVANIA
From 30-JAN-19 05:00:00 to 31-JAN-19 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -30.0 F was measured at Monaca, PA on Jan 30th.

Extreme Cold/Wind Chill in BUTLER, PENNSYLVANIA
From 30-JAN-19 01:00:00 to 31-JAN-19 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -25.0 F was measured at Saxonburg, PA on Jan 30th.

Extreme Cold/Wind Chill in CLARION, PENNSYLVANIA
From 30-JAN-19 01:00:00 to 31-JAN-19 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -29.0 F was measured at Clarion, PA on Jan 30th.

Extreme Cold/Wind Chill in FAYETTE, PENNSYLVANIA
From 30-JAN-19 11:50:00 to 30-JAN-19 11:50:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -25.0 F was measured near Connellsville, PA on Jan 30th.

Extreme Cold/Wind Chill in INDIANA, PENNSYLVANIA
From 30-JAN-19 01:00:00 to 31-JAN-19 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Unknown

A CWOP measured -27.0 F wind chill near Clymer, PA on Jan 30th.

Extreme Cold/Wind Chill in JEFFERSON, PENNSYLVANIA
From 30-JAN-19 01:00:00 to 31-JAN-19 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A wind chill of -28.0 F was measured at DuBois Airport on Jan 30th.

Extreme Cold/Wind Chill in LAWRENCE, PENNSYLVANIA
From 30-JAN-19 01:00:00 to 31-JAN-19 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -30.0 F was measured at New Castle, PA on Jan 30th.

Extreme Cold/Wind Chill in MERCER, PENNSYLVANIA
From 30-JAN-19 01:00:00 to 31-JAN-19 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -32.0 F was measured at Greenville, PA on Jan 30th.

Extreme Cold/Wind Chill in VENANGO, PENNSYLVANIA
From 30-JAN-19 01:00:00 to 31-JAN-19 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -29.0 F was measured at Franklin Airport on Jan 30th.

Extreme Cold/Wind Chill in WASHINGTON, PENNSYLVANIA
From 30-JAN-19 12:19:00 to 30-JAN-19 12:19:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

A wind chill of -26.0 F was measured near Burgettstown, PA on Jan 30th.

Extreme Cold/Wind Chill in FOREST, PENNSYLVANIA
From 30-JAN-19 01:00:00 to 31-JAN-19 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Unknown

The surrounding area had wind chills temperatures near -29.0 F.

Extreme Cold/Wind Chill in FAYETTE RIDGES, PENNSYLVANIA
From 30-JAN-19 05:00:00 to 31-JAN-19 23:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Unknown

Surrounding areas had wind chill values below -25 F.

Extreme Cold/Wind Chill in WESTMORELAND RIDGES, PENNSYLVANIA
From 30-JAN-19 05:00:00 to 31-JAN-19 23:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Surrounding areas had wind chill values below -25 F.