New England Weather Discussion

(With thanks to the surrounding National Weather Service Offices)

Time of the readings below: 25 Apr 2024 10:22 AM
Current Temperature: 41.6°F (4.4) 
High Temperature for the day: 41.6 at 10:19 AM.
Low Temperature for today: 30.0 at 5:06 AM.
Rainfall Today: 0.00 inches
Current Dewpoint: 12.5°F (0.4)
Hours of Daylight Tomorrow: 13:54
Find all of my instrument readings here.

Last complete site update: 4/25 - 7:03 AM

Schedule News: There will be NO Thursday evening weekend outlook email this week. I have updated the site this morning (04/25), then the next update will be Friday evening (04/26). I have posted weather through Sunday in the dailies. Regular updates can be expected throughout the weekend.

Expect a warm up (Finally) for early next week.
Nighttime microphysics satellite imagery early this morning shows clear skies across the region. West-northwesterly winds remain gusty in most locations with some gusts still between 25-30 mph. Breezy conditions will persist through daybreak in most locations, although a few valley spots could briefly decouple. Current temperatures are primarily into the 20s but a few lower 30 degree readings persist over southern NH and coastal western ME. A few additional degrees of cooling can be expected through daybreak.

Surface high pressure will remain over the region today but a trough axis will keep temperatures aloft on the cool side. This will result in mainly sunny skies and low afternoon relative humidity as we mix into a very dry airmass aloft. Afternoon relative humidity will fall into the middle teens to 20s percent range in most areas, lowest south of the mountains and away from the immediate coastline. West to northwesterly winds will also persist at between 10-15 mph, gusting to around 25 mph at times. This combined with the low relative humidity could cause increased fire weather concerns. Latest High Resolution guidance continues to indicate the development of onshore flow along the coast by mid-afternoon, which will allow Relative Humidity to increase over coastal locations. Given the very dry airmass and abundant sunshine, went on the warm side of guidance for afternoon high temperatures. This places readings into the middle to upper 50s for many areas south of the mountains and away from the immediate coast.

Mainly clear skies will persist tonight with winds quickly decreasing this evening with the loss of daytime heating/mixing. This will set the stage for likely excellent radiational cooling conditions despite the relatively short nights of late April. As a result, used model guidance for overnight lows and pushed down the normally colder valleys down a few additional degrees. This places lows into the teens across the normally colder interior valley locations with 20s in most other locations.

Sunny skies and dry conditions will continue on Friday with temperatures aloft warming by around 41F. This combined with deep afternoon mixing will allow for warmer high temperatures into the upper 50s to middle 60s south of the mountains, warmest in southern NH. Relative humidity will once again fall into the teens to 20s percent range during the afternoon hours. Surface westerly winds will be weaker as compared to today and this will likely allow for an earlier start to the seabreeze and it will likely penetrate further inland with increasing relative humidity behind it.

Long range:
High pressure will remain anchored over northern New England as we begin the long term portion of the forecast. With clear skies, light winds and low dew points, expected a large diurnal curve with lows dropping below freezing in all areas with 20s in the north and lower 30s in the south.

More sunshine is expected on Saturday as the large ridge of high pressure begins to slip off the Northeast coastline. A southwesterly flow will develop by late in the day and will allow temperatures to climb through the 60s.

The 7PM model runs remain in relatively good agreement allowing a warm front to approach the region from the west Saturday night. This will allow for a few showers to enter the region, mainly over northern and western areas. Scattered showers will continue on Sunday with readings in the 60s in most areas. The exception will be coastal areas where temperatures will be in the 50s.

Temperatures will peak early next week. Temperatures near
54F aloft and some sunshine will allow temperatures to reach the 70s over southern New Hampshire and 60s over interior Maine. Very cold water temperatures in the Gulf of Maine will allow for chilly temperatures will onshore winds and readings in the 50s. A nearly stationary front will allow for a few more scattered showers across the region.

Temperatures will begin to cool off by midweek next week with plenty of cloud cover and some cold air advection.

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