Apr 3, 2015 12:56 PM

NH1 Weather Window with Joe Joyce: Expect quick, frequent changes

NH1 Chief Meteorologist - NH1.com

Looks like clouds will prevent us from really scorching today, but still enjoy the warmth while it lasts Friday! Highs will be climbing well into the 60's with a mix of clouds and sun this afternoon. A cold front is stalling across Southern New England today, with another wave of low pressure quickly following in behind. So even with breaks of some sunshine today, clouds will quickly be increasing again as our next batch of rain will be approaching tonight!

This next batch of rain this evening will come with a bit more rain than last night's showers. Expect about .30-.75" of rain to fall between 10 PM this evening and early Saturday morning. The Low will strengthen as it tracks over Southern New England overnight and into the Gulf of Maine early Saturday morning. A press of colder air from Canada colliding into the spring warmth will allow this low to deepen overnight. Rain will be changing to snow across the north country over night where 3-6" of snow will be falling over the White Mountains through Saturday morning.

The weekend will get off to a bit of a rocky start. A mix of snow and rain will linger during the early morning hours Saturday morning. Most of the showers will be tapering off by 9 AM, Snow showers will linger in the north through the midday. Wet snow flakes will mix down all the way to Laconia, and Concord for a few moments early Saturday, but no accumulation is expected. It will likely be a plowable snowfall in the far north where a Winter Weather advisory is currently in effect. Some of the White mountains could see up to 6+"!

Strong chilly NW winds will be following in Saturday behind our departing low. Gusts over 30 mph will be possible. Clouds will try to break a little in the afternoon with this drying down sloping flow off the mountains. Highs Saturday will be cooler averaging in the mid 40's. Winds will be lighter Sunday, but a cool WNW wind direction will keep temperatures in the Lwr-mid 40's. A weak cold front pushes through Sunday which could agin trigger off a brief rain or snow shower, especially across the north country.

After the weekend, the weather will become a bit more interesting and unpredictable. Everyday the timing, placement of precipitation, and temperatures are a bit different. These changes will continue.
The problem is what we call a thermal gradient. A boundary separating the cold from Canada and the warmth building across the nation will set up right over New England. As the upper flow of wind tracks right over our heads, Another low will approach New England Sunday night and Monday. The front will stall over us. Expect more snow showers to develop Monday along this stalled front. There is the potential for a small accumulation of snow in this band of snow.

Today, it looks like High pressure will deepen and slide south just enough to push this stalled front farther south on Tuesday for a mostly dry day, but supplying cool NE winds. We'll see. The high will eventually weaken, pull away and open the door for more unsettled weather to push back inot the northeast around Wednesday Thursday in the form of rain and snow showers. Best chance of snow showers will be from Laconia North. It is really just an ugly looking pattern with times of wet and times of dry weather right into next weekend. Definitely not the kind of weather we are all desperately waiting for. ... someday, someday.


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