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Christmas 1994 nor'easter

Cyclone

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Through Cyclone, Gulf Stream and Massachusetts

Heavy rain from the developing storm contributed to significant flooding in South Carolina. Much of the rest of the East Coast was affected by high winds, coastal flooding, and beach erosion. New York State and New England bore the brunt of the storm; damage was extensive on Long Island, and in Connecticut, 130,000 households lost electric power during the storm. Widespread damage and power outages also occurred throughout Rhode Island and Massachusetts, where the storm generated 30-foot (9.1 m) waves along the coast. Because of the warm weather pattern that contributed to the storm's development, precipitation was limited to rain. Two people were killed, and damage amounted to at least $21 million.

Meteorological history

The storm originated in an upper-level low pressure system that moved southeastward from the central Great Plains into the Deep South of the United States. After reaching the southeast Gulf of Mexico, the disturbance underwent cyclogenesis, and the resultant system moved through Florida on December 22 in response to an approaching trough. Forecasters lacked sufficient data to fully assess the cyclone for potential tropical characteristics, and as such, it could not be classified. The same trough that pushed the storm across Florida had moved to the north, allowing for high pressure to develop in the upper levels of the atmosphere.

Deemed a "hybrid storm", the cyclone rapidly intensified in warm waters of up to 80 °F (27 °C) from the Gulf Stream combined with a cold air mass over the United States. The system continued to rapidly intensify while moving within the Gulf Stream; it developed central convection, an unusual trait for an extratropical cyclone, and at one point exhibited an eye. Despite these indications of tropical characteristics, it never was identified as tropical. On December 23 and 24, the nor'easter intensified to attain a barometric pressure of 970 mb (29 inHg). An upper-level low pressure system that developed behind the storm began to intensify and grew to be larger in size than the original disturbance. In an interaction known as the Fujiwhara effect, the broad circulation of the secondary low swung the primary nor'easter northwestward towards southern New York and New England. The original low passed along the south shore of Long Island, and made landfall near New York City on December 24. Subsequently, it moved over southeastern New York State. On December 25, the system began to rapidly weaken as it moved towards Nova Scotia, before the pair of low pressure systems moved out to sea in tandem in the early hours of December 26.

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