Pennsylvania, 2024Lake-Effect Snow in Pennsylvania, December 21, 2024
December 21, 2024 · NWS PBZ · 12 events in 3 counties and zones
Anomalously cold air moving in northwesterly flow over the still relatively warm Great Lakes resulted in a time period of well overperforming convective snow bands over Beaver, Allegheny, and parts of Butler county. Snow amounts in these areas ranged from 3 to 6 inches, with the highest amounts across northern parts of the Pittsburgh metro area.
Every event with a place to put it; 12 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 12
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.
Anomalously cold air moving in northwesterly flow over the still relatively warm Great Lakes resulted in a time period of well overperforming convective snow bands over Beaver, Allegheny, and parts of Butler county. Snow amounts in these areas ranged from 3 to 6 inches, with the highest amounts across northern parts of the Pittsburgh metro area. An Winter Weather Advisory was issued.
Lake-Effect Snow, Beaver
- When
- December 21, 8:00 AM EST to 10:00 PM EST
- Where
- Beaver forecast zone
- Reported by
- Public
- Coordinates
- 40.682, -80.349 (the zone’s center; the record gives no point)
The public reported 6 inches of accumulation in Baden, PA in Beaver county.
Lake-Effect Snow, Allegheny
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Allegheny forecast zone
- Reported by
- Public
- Coordinates
- 40.469, -79.981 (the zone’s center; the record gives no point)
The public reported 6 inches of snow accumulation 2 miles north of Franklin Park.
Lake-Effect Snow, Allegheny
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Allegheny forecast zone
- Reported by
- Public
- Coordinates
- 40.469, -79.981 (the zone’s center; the record gives no point)
The public reported 6 inches of snow accumulation in McCandless Township.
Lake-Effect Snow, Allegheny
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Allegheny forecast zone
- Reported by
- Public
- Coordinates
- 40.469, -79.981 (the zone’s center; the record gives no point)
The public reported 6 inches of snow accumulation one mile west of McCandless Township.
Lake-Effect Snow, Allegheny
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Allegheny forecast zone
- Reported by
- Public
- Coordinates
- 40.469, -79.981 (the zone’s center; the record gives no point)
The public reported 5.8 inches of snow accumulation in Bradfordwoods, PA.
Lake-Effect Snow, Allegheny
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Allegheny forecast zone
- Reported by
- Public
- Coordinates
- 40.469, -79.981 (the zone’s center; the record gives no point)
The public reported 5.8 inches of snow in Allison Park.
Lake-Effect Snow, Allegheny
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Allegheny forecast zone
- Reported by
- Public
- Coordinates
- 40.469, -79.981 (the zone’s center; the record gives no point)
Multiple reports were received of 5 inches of snow near Wexford.
Lake-Effect Snow, Beaver
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Beaver forecast zone
- Reported by
- Public
- Coordinates
- 40.682, -80.349 (the zone’s center; the record gives no point)
Snow accumulation of 6 inches was reported in Big Beaver.
Lake-Effect Snow, Beaver
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Beaver forecast zone
- Reported by
- Public
- Coordinates
- 40.682, -80.349 (the zone’s center; the record gives no point)
Snow accumulation of 6 inches was reported in near Conway.
Lake-Effect Snow, Beaver
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Beaver forecast zone
- Reported by
- Public
- Coordinates
- 40.682, -80.349 (the zone’s center; the record gives no point)
Snow accumulation of 5.5 inches was reported in near Fernway.
Lake-Effect Snow, Beaver
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Beaver forecast zone
- Reported by
- Public
- Coordinates
- 40.682, -80.349 (the zone’s center; the record gives no point)
Snow accumulation of 5.5 inches was reported in near Freedom.
Lake-Effect Snow, Butler
- When
- December 21, 8:00 AM EST to 11:00 PM EST
- Where
- Butler forecast zone
- Reported by
- Public
- Coordinates
- 40.912, -79.913 (the zone’s center; the record gives no point)
Multiple reports of 4 to 5 inches were received across extreme southwestern Butler county.
- Lake-Effect Snow
- Heavy snow in bands downwind of a large lake as cold air crosses warmer water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- High Wind and Heavy Rain in California, December 21 to 22, 202470 kt wind · 4 events
- Lake-Effect Snow in Ohio, December 21 to 22, 20242 events
- High Wind in Alaska, December 21 to 24, 202468 kt wind · 2 events
- High Wind and Heavy Rain in Nevada, December 21 to 22, 202488 kt wind · 2 events
- High Wind in California, December 21, 202460 kt wind · 1 event
- Winter Weather in Maryland, December 21, 20241 event
- Flood in Arkansas, December 21 to 31, 20241 event
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 2026-10-01. Each event’s entry at NCEI: 1229667, 1229668, 1229669, 1229670, 1229671, 1229672, 1229673, 1229674, 1229675, 1229676, 1229677, 1229678.