Dec 22, 2015 11:42 PM
NH1 Weather Insider with Joe Joyce: April 28, 2015
NH1 Chief Meteorologist
Areas of of Dense fog, areas of Black Ice, and lots of low clouds early Wednesday morning. Cooler air lies right over the Canadian border, in fact some of this cooler air is in place across New Hampshire early this morning with temps in the 30's. In the northern mountains and foothills temps are near freezing so this will be the area with the best chance of black ice.
If there are any breaks of early sun where you live, don't get excited. Clouds are filling back in today with a light east wind. Expect overcast skies with highs in the 40's and lwr 50's. As we have been talking about, our upper level wind flow from the southwest is directing mild air into the the northeast, but it is also directing a steady plume of clouds along with periodic disturbances in the upper low which help to trigger periodic rain. We will be tracking another batch of rain which will be arriving later on today shortly after sunset. The rain will fill in quickly Wednesday night and be heavy at times. The rain will start to weaken taper off after midnight, early Thursday morning with patchy fog. An additional half inch to one inch of rain could fall from this.
This rain will be triggered by a warm front at the surface. The boundary where warmer air is overriding the cooler air. That warm front will be right over us early Thursday morning, with cloudy damp foggy conditions. As the warm front lifts north, low clouds will erode, and warm breezy SW winds will filter in for the afternoon. I expect some breaking afternoon sun, and highs well into the 60's to near 70. Temperatures will be running a good 30-35 degrees above the typical December norm for this time of year. needless to say records will be shattered!
A cold front will push off the coast early on Christmas morning with slightly cooler air behind with winds shifting to the NW. Highs will still be well above average and likely be achieved during the morning-midday with highs in the 50's near 60. Some cooler air will be arriving in the afternoon evening with building high pressure.
The high will sit over us for a dry, cooler start to the weekend with highs in the mid 40's. Clouds will quickly be increasing Saturday ahead of our next disturbance. Showers will spread into New England in advance of an area of low pressure which will cross right through the region Saturday night and Sunday morning. The a cold front will stall over us for the afternoon with more clouds and maybe a few showers.
We will be in the middle of a major clash of the airmasses with cooler air pushing south and warmer air trying to push north. The cooler air from Canada will be trying to push away the unseasonal warmth. Colder air will follow in for Monday with weak high pressure. Low pressure will ride along this warm/cold boundary right back into the Northeast Monday night. This next batch of precipitation will be arriving at the coldest time of the day, along with a more significant low level cold in place. We will have to watch for a wintry mix Monday night/early Tuesday, as high pressure to our north will supply that low level cold and could make for some icy travel Monday night early Tuesday. There is a ton of exciting interesting weather to watch in the next 7 days...so stay tuned to any changes! We'll see you on WBIN-TV!