Updated at 10:55EDT 4/15


Fri-Sun 4/16-18
40% chance of a winter event
10% chance of a
severe winter event


None
0% chance of a winter event
0% chance of a
severe winter event


Friday 4/16
20% chance of a delay
0% chance of an early dismissal

0% chance of a cancellation


None
0% chance of a delay
0% chance of an early dismissal

0% chance of a cancellation
Snowday probabilities are made by Sam Lillo, for SAU29 in Keene. These percentages should not be relied on outside of Cheshire County, NH. In addition, in Cheshire County, please do all school work on time depsite the issued forecast.
Posted: 10/17/2009 09:01:00 PM

Okay, the temperatures outside are closer to November standards and the storms showing up on the forecast models are closer to December standards. One more in store, then we'll be returning to more seasonable weather.

This one looks quite interesting. It has been monitored for some time now as the last shortwave cycling through the trough over the east as it closes up and lifts northeast. We are looking at a double barreled low moving up the coast toward the region. This poses so many questions especially considering the time of year.

First, the track of this storm is still very much in question. The GFS has been fairly locked on bringing low pressure well north, while the NAM has been back and forth and the ECM has for the most part been south. High pressure to the north will be filtering in colder and drier air. This will help produce precipitation in the form of snow, however also create a tight cutoff to in precipitation to the north.

For precipitation type, chances for snow look good across the high terrain of New England, and even lower terrain north of Rt 2. There is good support for the development of banding somewhere over interior SNE. Where this sets up, strong omega with a marginal temperature profile may generate a few hours of moderate to heavy snow, that may accumulation several inches before all is said and done.

There is so much uncertainty. I have prepared a forecast snowfall map, but am cautious about posting anything definitive yet. At this point all I will say is that the Monadnock region could see accumulating snows tomorrow and maybe a suprise or two.





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