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The December 2009 North American blizzard was a powerful nor'easter that formed over the Gulf of Mexico in December 2009, and became a major snowstorm that affected the East Coast of the United States and Canadian Atlantic provinces. The snowstorm brought record-breaking December snowfall totals to Washington, D.C., Baltimore, and Philadelphia.
Here's how we compiled the list: We pored through 30-year average snowfall statistics of hundreds of locations in the U.S. from 1991 through 2020. We considered only those towns and cities with a ...
As the system moved towards the East Coast, snowfall rates began to increase to 1–2 inches (2.5–5.1 cm) per hour. The storm began to accelerate, and began to crank out the last burst of snowfall along the affected areas before moving offshore. Total snowfall accumulations ranged from 8–14 inches (20–36 cm), mainly in North Carolina. [11]
It dumped nearly twice the average monthly snowfall total (7.5 inches (19 cm)) on the city. Some parts of the foothills accumulated in excess of 40 inches (100 cm) of snow. [6] In the central and northern Plains freezing drizzle fell on Thanksgiving Day and Black Friday, transitioning to snow, and then heavy snow, overnight.
It was the blizzard of December 18-19, 2009. Known locally as Snowpocalypse, it would go down as the largest December snowstorm in the recorded weather history of the nation’s capital!
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Seasonal snowfall accumulation has ranged from trace amounts in 1972–73, to 78.7 inches (200 cm) in the winter of 2009–10. [105] [b] The city's heaviest single-storm snowfall was 30.7 in (78 cm), which occurred in January 1996. [106]
Due to the shifting track of the storm, the city of Philadelphia did not receive as much snow as had been predicted, with totals only approaching 4 to 6 inches (10 to 15 cm). [1] However, suburbs to the north and east of the city, the Lehigh Valley, and The Poconos did receive snow in excess of 12 inches (30 cm).