A cold front moved across northwestern Pennsylvania during the evening hours of December 27th.  Cold northwest winds behind this front caused lake effect snow showers to develop late in the evening.  Periods of moderate to heavy snow were reported from late on the 27th through late morning on the 29th.  The first of these periods occurred during the early morning hours of the 28th with a second period during the afternoon and evening hours of the 28th.  A brief period of heavy snow was also reported on the morning of the 29th.  Light snow or flurries occurred between the periods of heavier snow.  The snow ended completely by late afternoon on the 29th.  8 to 12 inches of snow was reported on much of Erie and Crawford Counties.  A few locations saw nearly 20 inches of snow during this evening.  Many accidents were reported.

Lake-Effect Snow in CRAWFORD, PENNSYLVANIA
From 27-DEC-09 21:00:00 to 29-DEC-09 17:00:00 (EST-5)
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Cold northwest winds blowing across Lake Erie caused lake effect snow showers to develop during the evening hours of December 27th.  Periods of moderate to heavy snow then continued through midday on December 29th.  Heavy snow occurred during the early morning hours of the 28th, during the afternoon and evening of the 28th and also on the morning of the 29th.  Snowfall rates at times exceeded an inch per hour.  Light snow or flurries were reported between the periods of heavier snow.  Snowfall accumulations across Crawford County ranged from 8 to 14 inches during this event with the higher amounts across the northern half of the county.  A maximum of 16.0 inches was measured near Meadville with 15.5 inches at Crossingville.  A few accidents were reported.

Lake-Effect Snow in SOUTHERN ERIE, PENNSYLVANIA
From 27-DEC-09 21:00:00 to 29-DEC-09 17:00:00 (EST-5)
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Cold northwest winds blowing across Lake Erie caused lake effect snow showers to develop during the evening hours of December 27th.  Periods of moderate to heavy snow then continued through midday on December 29th.  Heavy snow occurred during the early morning hours of the 28th, during the afternoon and evening of the 28th and also on the morning of the 29th.  Snowfall rates at times exceeded an inch per hour.  Light snow or flurries were reported between the periods of heavier snow.  Snowfall accumulations across inland Erie County ranged from 8 to 16 inches during this event.  A maximum of 19.6 inches was measured at Franklin Center .  A few accidents were reported.

Lake-Effect Snow in NORTHERN ERIE, PENNSYLVANIA
From 27-DEC-09 21:00:00 to 29-DEC-09 17:00:00 (EST-5)
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Cold northwest winds blowing across Lake Erie caused lake effect snow showers to develop during the evening hours of December 27th.  Periods of moderate to heavy snow then continued through midday on December 29th.  Heavy snow occurred during the early morning hours of the 28th, during the afternoon and evening of the 28th and also on the morning of the 29th.  Snowfall rates at times exceeded an inch per hour.  Light snow or flurries were reported between the periods of heavier snow.  Snowfall accumulations across northern Erie County ranged from 8 to 12 inches during this event.  A maximum of 12.4 inches was measured in Millcreek Township with 12.0 inches at North East.  Officially, 9.7 inches was measured at Erie International Airport.  A few accidents were reported.