New England Weather Discussion

(With thanks to the surrounding National Weather Service Offices)

Time of the readings below: 24 Apr 2024 2:16 PM
Current Temperature: 58.8°F (-0.9) 
High Temperature for the day: 60.3 at 1:21 PM.
Low Temperature for today: 43.4 at 6:47 AM.
Rainfall Today: 0.00 inches
Current Dewpoint: 40.7°F (-0.3)
Hours of Daylight Tomorrow: 13:51
Find all of my instrument readings here.

Last complete site update: 4/24 - 7:01 AM

Schedule News: There will be NO Thursday evening weekend outlook email this week. I will update the site through Thursday morning, then the next update will be Friday evening. I will post weather through Sunday in the dailies on Thursday morning as usual. Regular updates throughout the weekend.

Skies were overcast this morning in Peterborough, NH, but no rain has fallen as of this writing.
A cold front will cross the region today with an upper level short wave crossing the region during the midday hours. Models continue to be in relatively good agreement developing a weak area of low pressure along this system. Showers will cross western Maine and New Hampshire with the highest pops over the northern mountains.

The precipitation may end as a brief period of snow across the higher terrain this afternoon. Little accumulation is expected. Strong cold air advection and an increasing gradient will allow for gusty winds towards the later portion of today. Afternoon highs will generally be in the 40s north to the 50s in the south.

Gusty winds expected tonight with Portland probabilistic data plots suggesting wind gusts in excess of 25 kts. Clearing will continue as a large ridge of high pressure builds into the region from Canada. It will be chilly with lows in the upper teens north to the 20s south.

Much less in the way of wind is expected for Thursday as the ridge builds over northern New England. Highs will once again reach the 40s in the north to the lower to mid 50s across the south under mostly sunny conditions.

Long range::
Overview: A large dome of high pressure builds over the eastern Continental United States Thursday through Saturday. This will result in warm days and cool nights under partly to mostly sunny skies. High pressure then moves to our east by early Sunday as a weak frontal boundary arrives from the west, resulting in an increased chance for scattered showers Saturday night through part of Sunday. Showery conditions at times along with warm temperatures look to continue through early to mid next week.

Impacts: Low afternoon Relative Humidity is likely on Friday with values falling into the teens to 20s percent range. This will be in combination with west-northwesterly wind gusts up to around 25 mph, which could result in increased fire weather conditions.

Forecast Details: Surface high pressure will build over the eastern Continental United States on Thursday through Saturday, resulting in warm days and cool nights. Thursday night will feature mainly clear skies along with light winds, which will result in good radiational cooling conditions. Therefore blended in raw Model Output Statistics guidance into the overnight forecast, which brings some interior valleys down into the teens to near 20 degrees with middle 20s to near 30 degrees elsewhere. Friday will feature partly to mostly sunny skies with warm afternoon temperatures into the 50s to middle 60s from north to south. Westerly winds up to around 20-25 mph combined with afternoon Relative Humidity into the teens to 20s percent range could result in increased fire weather concerns but it will otherwise be a nice day.

Another night of radiational cooling is then likely Friday night under mostly clear skies and light winds. Lows will range from the 20s to lower 30s. Light winds and warm temperatures will prevail on Saturday with highs into the 60s in most locations. The weak flow will likely result in a sea breeze though, which would keep the coast cooler given current Sea surface temperatures. Clouds will increase by Saturday night with perhaps a few scattered showers by dawn as a front approaches from the west. Scattered showers and mainly cloudy skies are then likely on Sunday as the frontal boundary remains near the region. It does not look like a washout though and latest ensemble guidance suggests light rainfall amounts. Despite the clouds it will remain warm with perhaps a few 70 degree readings over southern NH depending on cloud cover.

Depending on the placement of another frontal boundary, some showery weather will remain possible at times through the first half of next week but rainfall looks to remain on the light side with temperatures remaining mild.

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