Hali Castleman Chris Kasprak VJ Vesnaver John Kerr October 34 1987 Record setting snowfall in Virginia Maryland Delaware Pennsylvania and Western New York The greatest snow total occurred in central Pennsylvania where 298 inches fell at Lock Haven ID: 406142
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Slide1
Early and late northeast snow storms
Hali
Castleman
, Chris
Kasprak
, VJ
Vesnaver
, John KerrSlide2
October 3-4 1987Slide3
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 1953Slide4
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 reportedSlide5
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 1977Slide6
Start With What We Know…
These early/late season snow storms are all familiar in some ways
Strong Low Pressure Systems
Combination of Lows Slide7Slide8
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? Slide9
500-hPa map
250-hPa map
Cutoff Low
Cutoff
LowSlide10
Cut Off LowsSlide11Slide12
Meeting of the low pressure system and the anticycloneSlide13
Where is the High Pressure?Slide14
With no anticyclones to the north bringing in the cold air, these early and late storms need to make their own.Slide15
Cooling by Melting- The Bergeron Process Slide16
Cooling by Melting
Cut Off Low
No source
Of Canadian
Arctic airSlide17
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 snowSlide18
500-hPa
maps
250-hPa maps
Cut off lowSlide19
Surface maps
850-hPa
mapsSlide20Slide21
Valid only: September and May