Franklin, New Hampshire Weather Forecast Discussion

537
FXUS61 KGYX 271729
AFDGYX
Area Forecast Discussion
National Weather Service Gray ME
129 PM EDT Sat Sep 27 2025
.SYNOPSIS...
High pressure remains over New England through early next week
with dry weather and warm temperatures. A cold front moves
through Tuesday, allowing for much cooler and continued dry
weather for midweek with potential frost.
&&
.NEAR TERM /THROUGH TONIGHT/...
Latest RAP13 pressure analysis on this Saturday afternoon shows
a ~1013 mb sfc high located over western New England with an h5
ridge axis extending from the mid-Atlantic through New England.
Visible satellite imagery shows come cirrus riding northeastward
along this ridge axis along with some diurnally driven cu across
portions of the area. Current temperatures are into the 60s to
middle 70s from north to south and some additional warming can
be expected through the remainder of the afternoon. A sea breeze
will tamper warming though for some coastal areas. It will
otherwise remain a pleasant and warm Fall day.
A weak sfc low will track northeastward tonight along a
stationary boundary draped from the Mid-Atlantic to southeast
of Cape Cod. This will result in increasing high-lvl clouds
along with some mid-lvl after midnight. The vertical column
looks to remain fairly dry though with weak forcing for ascent,
but despite this, an isolated shower is possible after midnight
through early Sunday across southern NH and perhaps York County,
ME. Overnight lows will primarily be into the 50s and valley
fog is possible.
&&
.SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/...
A sfc warm front will lift northward across the region on Sunday
morning with little fan fare but it will place the area into a
warm sector. This will allow highs to soar to well above avg
with readings into the lower to middle 80s south of the mtns
with 70s further to the north under partly to mostly sunny
skies.
Mainly clear skies and light winds on Sunday night will allow
for radiational cooling with lows falling into the 40s and 50s
from north to south. Valley fog is likely to develop overnight.
&&
.LONG TERM /MONDAY THROUGH SATURDAY/...
The dry pattern we`ve fallen back into will continue Monday through
the end of the long-term forecast period (next Saturday), possibly
longer with nearly unanimous support from the GFS/ECMWF individual
ensemble members.
New England will sit between an upper low over the Canadian
Maritimes and a 500mb ridge over the center CONUS for the first half
of the week. Monday will be warm and dry with highs in the 70s to
lower 80s, and then a couple of dry backdoor cold fronts will
gradually cool temperatures toward midweek. Behind these fronts,
strong Canadian high pressure builds in from the north and settles
on top of New England through late week. Not only will this continue
the dry weather, the high will bring some cooler temps with highs in
the 60s for Weds-Thurs and favorable conditions for radiational
cooling and cold nights with possible frost Tues night through
Thursday night. The frost potential looks mainly over the north
Tuesday night and then more widespread the next couple of
nights. The high begins to sink south Fri-Sat with temperatures
starting to moderate with light southerly return flow. Valley
fog is also possible most nights, especially along the CT River.
&&
.AVIATION /17Z SATURDAY THROUGH WEDNESDAY/...
Short Term...VFR conditions will persist through this evening
with generally light and variable flow, although onshore flow is
likely across coastal sites due to a sea breeze. Some MVFR
restrictions are then possible after midnight through around 12Z
Sunday at KPWM and KRKD, although confidence in this occuring is
low to moderate. There is moderate confidence for FG and IFR to
LIFR restrictions at KLEB though. The rest of Sunday will
feature VFR conditions areawide with S-SW winds of 10-20 kts.
Valley FG is then likely Sunday night at KLEB, KHIE, and perhaps
KCON with IFR-LIFR restrictions possible. No LLWS is
anticipated through the period.
Long Term...Mostly VFR will continue from Monday onward with
restrictions mainly limited to nighttime and morning valley fog at
HIE and LEB.
&&
.MARINE...
Short Term...High pressure will remain near or over the waters
through Sunday with winds and seas remaining below thresholds
hazardous to small crafts, although a few southwesterly gusts on
Sunday afternoon could approach 25 kts outside of the bays.
Long Term...High pressure keeps winds/seas under SCA levels
through Monday night. A couple of backdoor type front cross
Tues-Weds, and then SCA conditions are possible Tuesday through
Thursday as north to northeast winds increase with strong high
pressure building in from the north. In addition to these winds,
the waters will likely start seeing long-period swells from
distant tropical cyclone Humberto on Tuesday, which may build
seas to SCA levels prior to the increasing winds. Winds and
seas will diminish Thursday night into Friday as the high
builds more overhead.
&&
.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...None.
&&
$$
NEAR TERM...Tubbs
SHORT TERM...Tubbs
LONG TERM...Combs

NWS GYX Office Area Forecast Discussion