1016mb High pressure located near DCA will move northeast into Maine by tomorrow morning. This will keep partly to mostly sunny skies across the region today, and clear skies tonight. Radiational cooling will allow temperatures to fall into the teens by tomorrow morning.
Low pressure will move south out of Minnesota this evening, into Missouri and Illinois by Sunday morning, before turning east toward Ohio in the afternoon. This low will pull another storm system north out of the Gulf of Mexico, and toward DCA by Sunday evening.
Steady precipitation will reach Keene by 5pm. Temperatures will be in the mid 30's. Temperatures will fall during the evening, and any rain / snow mix will likely change to snow after 7pm. Snow will fall steadily though 10pm possibly accumulating to an inch, before mixing with sleet, freezing rain and rain. This wintry mix will continue through 2am. Another inch of snow / sleet combination could fall in that time period. After 2am, precipitation will take on liquid form as either rain or freezing rain. Any surface cold pockets will be scoured out by 7am Monday morning, so icing should end around that time. Up to .15" of icing may occur.
Precipitation type will depend significantly on how high pressures remain to our north, the ultimate track of the coastal low, and which low has dominance (Great Lakes, or coastal).
Current forecast through 12z Monday
Snowfall: 1" (below 1000ft), 2" (above 1000ft)
Ice accretion: .1" to .15"
Accumulation confidence:
>1" snow - 65%
>4" snow - 15%
>.1" ice - 60%
Monday delay potential -
Much will depend on how long icing can last. If freezing rain is ongoing at 5am, chances are that with previous accumulations, a delay will be very likely.
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