Developing Rain Today

Hello everyone!

While most of the area is currently seeing either light precipitation or dry conditions, that will be changing as we move through the day today. A front will be approaching from the southwest, and tropical moisture will be flowing northward ahead of the front. This combination will result in bands of moderate to heavy rain this afternoon and evening.

This steadier/heavier rain will arrive in NH just after noon before moving into Maine during the early afternoon hours. Before then, light precipitation will continue to pose a mixed precipitation/ice threat away from the coast.

As we move towards the evening, any remaining near-surface cold air will retreat farther towards the mountains, and bands of moderate-heavy rain will be rotating through from SW to NE. The rain won’t be intense enough to cause any major flooding issues, but low-lying areas typically vulnerable to urban/small stream flooding may see water for a brief time this evening. There may be some thunderstorms embedded within the final round of heavy rain right along the front itself. This line should move through NH around 8, arriving in Portland around 10.

Temps today will be unpleasantly chilly as low-level cold struggles to depart. Look for highs ranging from the low 30’s in the mountains to the mid 50’s in Southern NH. There will be a benefit to this cold air though, which is that it will mitigate the threat posed by strong winds as a low level jet moves overhead this evening. When temps warm with height (as is forecast tonight due to low level cold below 3,000 feet becoming trapped by mountains, which don’t extend with much regularity above 3,000 feet), the atmosphere is vertically stable, and air doesn’t move very far up or down. You need downward “momentum transport” from the jet layer at 5-7,000 feet to the surface to get strong winds in a setup like this, and with the exception of the immediate coastline east of Route 1 (where warmer surface temps will dampen the rate of warming with height), we’re not going to get much if any of that momentum transport tonight. This means that while winds will be breezy, I don’t expect any major power outage issues west of Route 1.

Rain will move northeast of the area around midnight with drying conditions expected behind the front.

-Jack

Cold With Spotty Wintry Precipitation Today

Hello everyone!

Today will feature very cold temps, at least for this time of year, along with areas of wintry precipitation. Snow will fall over northern areas today, sleet in central areas, and freezing rain in part of SW NH as warm air tries to move in overtop a very cold and very dry low level airmass. That low level airmass will be getting drier today, meaning that precipitation will wane as we move into the afternoon. Highs likely won’t get above freezing for much of the area, and winds will be steady out of the northeast. Our next round of precip arrives late tonight.

-Jack

Mild Today

Hello everyone!

Today will feature one last day of mild-ish weather before a powerful backdoor cold front rushes in tomorrow. Look for highs in the mid 40’s north and mid 50’s south. Fog is being reported across the area this morning, but a clearing trend should develop later this morning as the sun comes up and temps rise. Later in the afternoon/evening high clouds will increase ahead of our next storm system set to arrive in part tomorrow, then in full on Monday.

-Jack

Milder Today With Increasing Cloudiness

Hello everyone!

Today will feature milder temps and increasing clouds as warm air begins to displace the cold airmass that’s been lingering over the area for the past several days. We’ll start off with chilly temps this morning, but under the strong April sun and with warming temps aloft, highs will get up into the low 40’s north and low 50’s south. Abundant sunshine this morning will give way to afternoon and evening cloudiness as a storm system begins moving past the region to the north. This system could bring some rain showers to western NH by sundown, and those showers will move farther east into Maine after dark.

-Jack

Warmer Today

Hello everyone!

Today will feature slightly warmer conditions as the core of our recent cold airmass drifts east. Look for highs to range from 35 in the north to 45 in the south. Areas of dense fog are present this morning, and with temps below freezing much of that is freezing fog. As a result, keep an eye out for some slick spots until those temps bump up a little bit. Outside of foggy areas, this morning should feature a mainly clear start before clouds arrive midday in advance of our next frontal system.

-Jack

Cool And Unsettled Today

Hello everyone!

Today will feature cool and unsettled weather as an upper level disturbance approaches from the west. This disturbance will bring plenty of clouds to the area today, as well as some rain and snow showers especially this afternoon. Showers will fall as snow in the mountains and as a rain/snow mix closer to the coast. Accumulations should remain under an inch. Highs will range from 32 in the north to 40 in the south.

-Jack

Clear But Chilly Today

Hello everyone!

Today will feature clear skies for most of the area along with cool temps as we remain under some colder air aloft. Look for highs to range from 25 in the north to 40 along the southern coastline. WNW winds will help keep a chill in the air in addition to setting up our quintessential upslope/downslope pattern for clouds and precip chances. The sunniest skies will be found along the coastline, with clouds and flurries continuing in the higher terrain.

-Jack

Reliably hype-free weather info for Western Maine and New Hampshire from amateur forecaster Jack Sillin

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