Saturday, March 5, 2011

Unsettled but mild

A large and moist low pressure system will bring rain and warmer temperatures this weekend.

Today:  Mainly cloudy, a few breaks of sun possible, chance of a wintry mix in the morning, changing to rain showers by 9 AM south, midday north.  Highs 42-47 in Southern New England, 35-40 in Central and Northern New England.

Tonight:  Mostly cloudy, slight chance of rain showers south, wintry mix north.  Lows near 40 south, low to mid 30s north.

Tomorrow:  Mainly cloudy again, warmer with rain developing in the afternoon, becoming steady in the evening, highs in the 50s south, upper 40s north.  Rain will change to snow north overnight on Sunday night.

Monday:  Rain, mixed with snow north, wintry mix in SNH and Central MA comes to an end in the morning.  Breezy and cooler.  Highs near 40 south, mid and upper 30s north.  3 to 6 inches of snow possible for Northern VT and Northen NH.

The why and how:

The low pressure system that is approaching is pushing a warm front through the region this morning, this is what kicked off the precipitation.  There were a few snow showers in Central and Northern New England and a light wintry mix in Southern New England.  This should push north of the region by the early afternoon.  Our best chance of seeing any sun this afternoon as a I see a few breaks in the clouds over Eastern PA and NJ currently.  Any sun we see will be isolated and short lived unforuntately.

This low pressure system is creeping eastward and this will keep the majority of the precipitation will hold off until later in the day on Sunday.  Temperatures will be warm enough by then for everyone to see rain.  The downside to this is the threat of the flooding for nearly all of New England.  There still looks like there will some spots that could see 2+ inches of rain.  I'm feeling more confident that this will happen somewhere in Central or Southern New England.  As this storm system gets closer, some cold air will start to work in, especially in far northern VT and NH.  This transition will begin overnight on Sunday.  Everyone should start off with rain, expect maybe extreme Northwestern VT, around Burlington.  As ths storm moves through, the rain/snow line will push eastward, making it as far as the NH border down into Central MA before the precipitation moves out.  Accumulations of 3-6 inches are possible in Northern VT/NH, 2-4 in Central VT and NH, with little or no accumulation in Central MA and Southern NH.  Some forecast models are predicting much, much more snow than I have forecast currently.  I will re-evaluate tomorrow.  Central and Northern Maine could get hammered by this storm, potentially seeing over 2 feet of snow.

Flooding still remains a concern.  So far the National Weather Service has not issued any Flood Watches for New England, but I expect some to be issued later today.  If you have storm drains in front of your house that are covered with ice, today might be a good day to clean that ice off if possible.

Long range:

Beyond Monday's storm, temperatures will be seasonable for a couple of days before warming back up again.  Look for another storm system late next week, looks like mostly rain at this point.

Thanks for reading!

-Jon the weatherman

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