Dec 29, 2015 12:41 AM
NH1 Weather Insider with Joe Joyce: December 29,, 2015
NH1 Chief Meteorologist
A big weather day across the region! Snow! Amazing that it has taken until December 29th to get our first measurable snowfall. It is time. Unfortunately, the timing is not great as the heaviest snow is happening during the morning commute between 5 AM and 9 AM. Plenty of cold air is in place at the start of the day thanks to Canadian high pressure to our north. Steady batches of moisture are running into this cold dome this morning. We will see a widespread 3-6" snowfall on the ground before any mixing begins to take place. Across the north country, the cold air will hang on the longest...for most of the day. I expect the heavier snow totals in the mountains where up to 8-12" of snow will fall. Farther south in the Lakes Region and Carroll County, I expect about 6-8".
While Tuesday morning starts off snowy, warmer air will be moving in aloft, as a secondary wave of low pressure will be tracking south of New England. The warmer air aloft will punch in during the morning, melting the snow flakes before they reach the ground, but they will refreeze near the surface as they fall back into the colder air...SLEET! Sleet will spread from north to south during the mid-late morning. Sleet on top of snow will make for a sloppy mess, but will help roads improve slightly...and become more wet than white. Travel today will be tricky, but I have a feeling they will be well treated with the advanced warning and the warmth of December which is still radiating from the ground.
Along the seacoast, enough warm air will penetrate to the ground to make for a full change over to rain in the afternoon. The low will be pulling away during the afternoon, taking the heaviest precip along with it. BUT, cold air will remain down at the ground inland away from the coast, despite the warm push of air through New England. This means we will be watching for pockets of freezing rain during the afternoon, with the most likely area to see cold air damming in the valleys with temperatures near 32 will be near Concord, NH towards the SW section of the state in Cheshire and Hillsboro counties where we could see up to a .10 to .25" of ice form on colder surfaces. Luckliy, the precip will be winding down in the afternoon, but the low level moisture will be an issue with freezing drizzle lasting right through the evening with snow showers in the mountains. So even though the mix will be much light, the unsettled icy weather will continue into the evening with the low level clouds and moisture and cold surfaces.
We will be having frequent cut-ins on NH1 News on WBIN-TV through the day so stay tuned for any changes! Be safe out there!