Download - Early and late northeast snow storms
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EARLY AND LATE NORTHEAST SNOW
STORMSHali Castleman, Chris Kasprak, VJ Vesnaver, John Kerr
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•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
November 6-7 1953
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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
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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
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Start With What We Know…
These early/late season snow storms are all familiar in some ways Strong Low Pressure Systems Combination of Lows
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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?
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500-hPa map
250-hPa map
Cutoff Low
Cutoff Low
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Cut Off Lows
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Meeting of the low pressure system and the
anticyclone
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Where is the High Pressure?
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With no anticyclones to the north bringing in the cold air, these early and late storms need to make their own.
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Cooling by Melting- The Bergeron Process
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Cooling by Melting
Cut Off Low
No sourceOf Canadian Arctic air
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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
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500-hPamaps
250-hPa maps
Cut off low
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Surface maps
850-hPamaps
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Valid only: September and May