Today will feature slowly clearing skies as the area of low pressure that brought snow to the region last night moves off to the northeast. Most of the area is done with accumulating snow as of 6 AM, but radar imagery shows some flakes still flying across the mountains and far eastern parts of the area. An additional 1-2” is possible in the mountains due to upslope flow and the presence of a weak surface trough, while eastern areas near the Camden Hills are likely only to pick up a dusting-1” of additional snow.
As per usual, skies will clear first along the coastline midday before sunshine expands north and west later in the afternoon. Most of the mountains will have to wait until tomorrow for sunny skies. NW winds will pick up behind this storm, but that process will take a little longer than usual as light winds linger ahead of the weak surface trough I mentioned earlier. Some gusts in the 25-30 mph range are possible later this evening, with the primary impact being wind chill related.
High temps today will range from the low 20’s in the northern mountains to the upper 30’s in SE NH.
Today has started off on the chilly side as an area of strong Arctic high pressure has finally settled in behind Thursday’s storm system.
Temps as of 9 AM are still stuck in the single digits for most places, with a few readings a little above 10 noted in southern areas (and Mt. Washington which believe it or not is among the warmer spots this morning due to an inversion, which is a layer where temperatures warm with increasing height.
Satellite imagery shows mid/high clouds moving into the region from the west ahead of our next storm system which is currently moving through the Great Lakes. Any morning sunshine will be relatively short-lived, especially over southern and western parts of the area. Most of today will feature overcast skies, which means it will be harder for temps to warm up.
With that in mind, expect high temps to range from 15 in the north to 25 in the south which is a bit below climatological averages, but not by much.
Composite radar imagery shows precipitation struggling to advance northeastward this morning as most of the leading-edge snow evaporates in the layer of very dry air near the surface.
This morning’s weather balloon observation from the Gray NWS office highlight that layer of very dry air below the 700mb pressure level (about 10,000 feet above the ground). That layer of dry air will be reinforced by continued light NNW flow in the low levels.
With that in mind, here’s a look at the HRRR’s simulated radar imagery for the upcoming event. Light/moderate snow will overspread the region this evening from SW to NE, and will become heavy around midnight before clearing out early tomorrow morning. The vast majority of this storm’s precipitation will fall as snow, but a brief period of sleet/freezing rain is possible in southern NH tomorrow morning.
Here’s the NWS forecast for snowfall totals at the end of this event. Most of the area should see around 4-8″ with locally higher totals possible in the mountains. Snow ends quickly tomorrow morning with little impact to commutes either this evening or tomorrow morning.
Today will feature clear skies and cold temps as strong Canadian high pressure builds into the region from the west. This morning, the center of that high is located over southern Ontario which means we’re still stuck with last night’s gusty NW winds. Those winds will continue for a few more hours before tapering off midday. Skies across the region are clear this morning, and will remain so throughout the rest of the day. Temperatures will be on the chillier side, but even this cold blast is pretty tame by Maine/New Hampshire January standards. Highs will range from around 0 in the north to around 15 along the coast.
Today will feature a fast-moving snowstorm as low pressure rapidly traverses the state of Massachusetts. Radar imagery shows moderate/heavy snow banding well underway across the entire area this morning, perhaps with the exception of light snow along the Canadian border. Snow will continue to fall steadily through this afternoon, especially along Maine’s coastal plain. Farther south in NH, rain will mix with snow and lead to lower accumulations. Some mixing may also occur east of I-95 and south of Portland. Snow will taper off from west to east this afternoon. As the low rapidly intensifies offshore, heavier snow will linger along the coast into the early evening hours before departing around 6-7 PM.
The highest snow totals today will generally be found north and east of Portland where 4-8” will fall. This area will also include most of Cumberland County and northern York County, even those areas that are west of PWM. Amounts will slowly taper off W/NW of a Fryeburg/Waterville line, with only 1-3” expected along the Canadian border.
High temps today will range from 25 in the north to 35 in southeastern NH.
My apologies for the lack of post yesterday morning, I’m down at the American Meteorological Society’s Annual Meeting in Boston and had a few more meetings than were originally on my schedule. Anyways, today’s weather looks fairly tame across the region as westerly winds carry drier, but not colder, air into the region. As per usual, westerly flow means we’ll have a classic upslope/downslope pattern set up where clouds stick around in the mountains while the coastal plain enjoys mostly sunny skies. Temperatures will follow a similar pattern, with highs in the upper 20’s north and low 40’s south. No precipitation is expected until our next storm moves in late tonight.
Today will feature some light precipitation as warm air tries to move back into the region after cooler air moved in last night. Without much moisture (or lift), this storm won’t be able to drop much in the way of precipitation, but most areas should get a few flakes or raindrops this afternoon. Otherwise, expect cloudy and quiet conditions across the region. High temps will range from 25 in the mountains to 40 along the MA border. Any snow accumulations will remain under an inch, with the best chance for a coating up in the mountains.
New England weather is often fickle and the conditions you experience often depend considerably on your location. Today, we’ll see that maxim put on steroids as a very sharp frontal boundary stalls out over the area.
Temperatures this morning highlight this contrast well. Most of NH is relatively warm this morning, ranging from around 40 in the north to just shy of 65 in the south. York County ME has joined in the warm air with temps around 60, but just north in Lewiston temps are barely above freezing. The cold air located over much of Maine will slowly try to work its way south today, but its ability to do so will be curtailed by the advance of the storm system responsible for this whole mess which is currently moving through upstate New York.
Thankfully, you have to travel a bit farther north before temps dip below freezing. The freezing line, as best I can tell from limited observations, is somewhere around Route 2, and it will likely remain there for the rest of the day. Just north of that line, freezing rain is falling this morning. Thankfully, it looks like the window of opportunity for ice accretion will end up being a bit narrower than we thought last night. That means that instead of around a half inch of ice accretion, most spots likely end up closer to 1/4 or 1/3 of an inch. While scattered outages are still possible, this small change in the forecast should alleviate the concern of power outages for most.
Precipitation will end from west to east after the passage of a cold front later this morning. In the south, breezy SW winds will shift towards the WNW while northern areas see light NE breezes flip around to the WNW and become a bit stronger. WNW flow will produce a bit of downslope-induced clearing along the coast, but otherwise expect overcast skies today.
Temperatures, especially in the south, will fluctuate several times today so instead of spending a long paragraph explaining exactly what temperatures will do in a given location, I’ll leave you with this animation showing the HRRR’s forecast for temperatures each hour today beginning at 6 AM and ending at 7 PM. I find the temperature gradient over York County this afternoon particularly interesting. Over just 10-20 miles, the temperature will range from almost 70 to around 40!