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Early and late northeast snow storms

Hali Castleman , Chris Kasprak , VJ Vesnaver , John Kerr. Early and late northeast snow storms. October 3-4 1987. November 6-7 1953. Record setting snowfall in Virginia, Maryland, Delaware, Pennsylvania, and Western New York

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Early and late northeast snow storms

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  1. HaliCastleman, Chris Kasprak, VJ Vesnaver, John Kerr Early and late northeast snow storms

  2. October 3-4 1987

  3. November 6-7 1953 • Record setting snowfall in Virginia, Maryland, Delaware, Pennsylvania, and Western New York • The greatest snow total occurred in central Pennsylvania where 29.8 inches fell at Lock Haven

  4. April 18-19 1983 • Stalled vehicles and hazardous driving conditions resulted in the closure of many major highways • Heaviest snowfall in Pennsylvania and New York up to 19.6 inches reported

  5. May 9-10 1977 • Latest Recorded Snow in Boston • 500,000 People Without Power in MA • 12.7 Inches in Worcester • 10-20 Inches in the Berkshires Winchester CT 1977

  6. Start With What We Know… • These early/late season snow storms are all familiar in some ways • Strong Low Pressure Systems • Combination of Lows

  7. Characteristic Differences • They occur outside of the typical snowstorm season (December-March) • Nature of the low pressure systems • Where’s the High? • How does it get so cold?

  8. 250-hPa map 500-hPa map Cutoff Low Cutoff Low

  9. Cut Off Lows

  10. Meeting of the low pressure system and the anticyclone

  11. Where is the High Pressure?

  12. With no anticyclones to the north bringing in the cold air, these early and late storms need to make their own.

  13. Cooling by Melting- The Bergeron Process

  14. Cooling by Melting No source Of Canadian Arctic air Cut Off Low

  15. April 9-10 1996 • The significant snowstorm of the long winter of 1995\1996 • A few locations in Massachusetts, northern Rhode Island, and southern New Hampshire reported over 20 inches of snow

  16. Cut off low 500-hPa maps 250-hPa maps

  17. Surface maps 850-hPa maps

  18. Valid only: September and May

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