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North Walpole, New Hampshire Weather Forecast Discussion

026
FXUS61 KBOX 220739
AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 339 AM EDT Mon Sep 22 2025

.SYNOPSIS... Dry weather continues until the chance for some unsettled weather returns late Tuesday into Wednesday. Temperatures should also average about normal this week, with the exception of above normal temperatures Tuesday. Potential for a more widespread rainfall event Thursday and Friday.

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.NEAR TERM /UNTIL 6 AM THIS MORNING/... Key Messages:

* Warmer today after a cooler weekend

Dry weather continues today, though with high pressure now over the North Atlantic, southerly flow will aid in increasing temperatures and humidity. Winds may be more SE along the immediate coasts due to local seabreezes. Highs today will be in the 70s.

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.SHORT TERM /6 AM THIS MORNING THROUGH 6 PM TUESDAY/... Key Messages:

* Milder tonight with continued warmer air aloft

* Showers and thunderstorms move in Tuesday evening

Cloud cover increases tonight and winds shift more SW with high pressure well offshore and a front approaching from the west. Lows overnight will be milder in the mid to upper 50s, with some spots along the immediate coast reaching 60F.

With continued SW flow, temperatures and moisture increase for Tuesday. Dew points are expected to climb into the 60s and high temperatures are expected to be in the upper 70s, with the exception of the CT River Valley and much of eastern MA where low 80s are possible. This heat and moisture combined with the forcing from the approaching front will provide a favorable environment for showers and thunderstorms to develop in. Guidance indicates decent SBCAPE values for Tuesday afternoon/evening around 500 J/kg which would favor some rumbles of thunder, and modest 0-6 km shear may support an isolated severe storm or two. However, probabilities for severe weather are still low at this time. Locally heavy downpours are possible with sufficient forcing and PWAT values around 1.75".

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.LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/... Key Messages:

* Rain continues Tuesday night into Wednesday

* The pattern remains unsettled through the rest of the week

With waves of low pressure moving along the front, coverage of light to moderate rainfall may increase Tuesday night going into Wednesday. Cloud cover remains through Wednesday as winds shift more NE and rain chances continue through the day.

A longwave trough over the Great Lakes will continue to dig deeper into the Midwest and central CONUS midweek. Guidance still varies a bit on exact location, but surface low pressure moving over southern Ontario from the Midwest will be the main source of another chance at more rain for the end of the weak as its warm front moves across southern New England going into Friday. Deterministic models have rain chances increasing Thursday afternoon into Thursday night, but timing will likely change a bit as we get approach midweek. Depending on how this front tracks and another frontal boundary moving in after it, we could see more convection develop to end the week. Lift from this setup may also lead to some downpours as ensemble mean PWAT values are around 1.5" by Friday afternoon. The longwave trough may start to shift east Saturday into Sunday, though depending on how quickly it moves off into Atlantic Canada, we may continue to see the chance for some showers through the weekend.

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.AVIATION /07Z MONDAY THROUGH FRIDAY/... Forecaster Confidence Levels...

Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

Through Tonight...High Confidence.

VFR outside of some late night/early morning fog patches in the typical low-lying locations. Light/calm winds early this morning become light S winds today with sea breezes on the immediate coast. Light SW winds expected tonight with MVFR/IFR cigs possible by early Tuesday morning.

Tuesday...Moderate Confidence in categories.

MVFR with pockets of IFR possible throughout the day. Ceilings may end up more borderline VFR/MVFR as the day goes on and chances for TSRA/SHRA increase in the evening. SW winds to 10 kts across the region with locally higher winds over the Cape and Islands. Gusts there to 20 kts possible.

KBOS Terminal...High confidence in TAF.

KBDL Terminal...High confidence in TAF.

Outlook /Tuesday Night through Friday/...

Tuesday Night: Mainly VFR, with areas MVFR possible. SHRA likely, slight chance TSRA.

Wednesday through Wednesday Night: Mainly VFR, with areas MVFR possible. Chance SHRA.

Thursday through Thursday Night: Mainly VFR, with local IFR possible. Chance SHRA.

Friday: Mainly VFR, with local MVFR possible. Breezy. Chance SHRA, slight chance TSRA.

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.MARINE... Forecaster Confidence Levels...

Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent.

Through Tuesday...High Confidence.

High pressure south of the Maritimes leads to relatively light winds and seas across the waters until Tuesday morning. Good visibility. Seas to 5 ft are expected over the waters Tuesday. Small Craft Advisories have been issued for much of Tuesday into Wednesday as a precaution.

Outlook /Tuesday Night through Friday/...

Tuesday Night: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers, slight chance of thunderstorms.

Wednesday through Thursday: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers.

Thursday Night: Winds less than 25 kt. Chance of rain showers.

Friday: Winds less than 25 kt. Chance of rain showers, slight chance of thunderstorms.

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.BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...Small Craft Advisory from 2 AM Tuesday to 8 PM EDT Wednesday for ANZ250. Small Craft Advisory from 8 AM Tuesday to 8 AM EDT Wednesday for ANZ254-255. Small Craft Advisory from noon Tuesday to 4 AM EDT Wednesday for ANZ256.

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SYNOPSIS...Belk/Hrencecin/FT NEAR TERM...Hrencecin SHORT TERM...Hrencecin LONG TERM...Hrencecin AVIATION...Hrencecin MARINE...Hrencecin

NWS BOX Office Area Forecast Discussion

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