A departing low pressure system moving off the eastern seaboard of the United States allowed for an extended period of northwesterly flow across central Pennsylvania, allowing for lake effect snow showers to drift into northwestern Pennsylvania from the evening hours of December 2, 2024 and continuing through the morning hours of December 4th, when a surface trough began to disrupt northwesterly…
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CTP wrote it up.
A departing low pressure system moving off the eastern seaboard of the United States allowed for an extended period of northwesterly flow across central Pennsylvania, allowing for lake effect snow showers to drift into northwestern Pennsylvania from the evening hours of December 2, 2024 and continuing through the morning hours of December 4th, when a surface trough began to disrupt northwesterly flow and shut off the prolonged lake effect snow. The heaviest snowfall by the end of the event was confined to northwestern Warren County, with western portions of McKean County also receiving upwards of 8-10 inches of snowfall.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS State College, PA wrote its last area forecast discussion before the first event at Dec 2, 2:22 AM EST, 53 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
3 lake-effect snow. Local standard time, as filed.
Lake effect snow bands produced 8 to 12 inches of snow across Warren County with amounts as high as 16 inches near Russell.
Lake effect snow bands produced 6 to 8 inches of snow across portions of McKean County with amounts up to 11 inches near Eldred.
Lake effect snow bands produced 1 to 3 inches of snow across much of Potter County with amounts as high as 6 inches near Roulette.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2024Every state in 2024This day in weather historyWarnings in Pennsylvania, December 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 1224199, 1224202, 1224205.