Hanover, New Hampshire 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

286
FXUS61 KGYX 071430
AFDGYX

Area Forecast Discussion
National Weather Service Gray ME
1030 AM EDT Sat Jun 7 2025

.SYNOPSIS...
Showers and thunderstorms will continue today, bringing a
localized renewed flood threat. A break arrives Sunday as high
pressure briefly builds. Conditions become unsettled next week
with widespread showers Tuesday into Wednesday. Improving
conditions are then expected for the second half of the week.

&&

.NEAR TERM /THROUGH TODAY/...
1030 AM Update...Another quick update to align with observations
as rain is quickly overspreading the area. An early look at the
latest runs of the CAMs suggest heavier showers once again
confined to southern New Hampshire, and maybe making a run at
the Seacoast and southern Maine coast late this moring into the
first part of the afternoon. The coast has been a bit drier and
flash flood guidance a bit higher there, so no changes are
necessary to the Flood Watch.

740 AM Update...Just a quick update to bring things in line with
latest observations. The forecast remains on track with our next
round of rain approaching from the west. Main focus through the
morning will be monitoring areas of embedded heavier showers for
a flash flooding threat, especially in areas that received
significant rainfall yesterday.

Latest RAP13 pressure analysis early this Saturday morning shows
surface low pressure located over northern NH and northwestern
ME with a quasi-stationary front draped across the region.
Northeast radar mosaic shows scattered light showers moving
generally from west to east and mixed in between are areas of
fog, some of which has become locally dense. It will continue to
be a damp but mild morning with reduced visibility at times due
to fog.

Another rainy Saturday is on tap for today as another area of
low pressure rides along the lingering frontal boundary. The
added cloud cover and earlier arrival time of the rain will
limit highs compared to Friday and this should result in overall
less instability and therefore less convection. Despite this,
precipitable water values will remain high with values around
1.5", and this combined with the added forcing for ascent and
deep warm cloud depths will result in additional locally heavy
rainfall.

The latest 00Z HREF probability match mean is suggesting that
portions of southern NH could once again receive some of the
heaviest rainfall, although perhaps a bit further east than
Friday. The 24-hr maximum is between 2-3", and should this fall
where 3-5" of rain fell yesterday, then this would likely
result in additional flash flooding. As a result, went ahead and
issued a new Flash Flood Watch for portions of interior south-
central NH as these are the locations that will be most
susceptible to renewed flooding concerns.

High temperatures will be mostly into the lower to middle 70s.

&&

.SHORT TERM /TONIGHT THROUGH SUNDAY/...
Low pressure exits tonight with rain ending from west to east
this evening. Some clearing is possible overnight, which
combined with the wet ground will likely result in fog. Lows
will mostly be into the 50s.

Canadian high pressure build in on Sunday, allowing for a
comfortable day with partly sunny skies and lower humidity.
Highs will be into the middle to upper 70s.

&&

.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
Long Term Update... Little change in the latest NBM suite of
guidance. A strong signal for rain mid-week still exists.

A negatively-tilted wave swinging by Monday, increasing clouds
and scattered showers with cooler temperatures in the 60s.
Conditions briefly dry out Monday Night before a more amplified
and organized upper trough moves over the Great Lakes Tuesday.
Increasing rain chances with isolated thunder will develop as
the system approaches, with the cold front passing Tuesday night
into Wednesday morning. Looking at likely pops, and WPC Day 5
marginal ERO risk already clips the Connecticut Valley.
Afterwards high pressure build in from the west and conditions
dry out with seasonable temperatures through the end of the
week. At the time of this issuance next Saturday`s forecast
looks favorable with a low probability for rain. Could it end
the 12-13 straight rainy Saturday run? Time will tell.

&&

.AVIATION /15Z SATURDAY THROUGH WEDNESDAY/...
Short Term...IFR to LIFR restrictions will persist through today
due to a combination of low ceilings, FG, and RA. Winds will
generally be light and variable. Restrictions will lift some
tonight, although FG is likely to redevelop which will result in
additional restrictions. Mainly VFR conditions are then expected
on Sunday with a developing onshore flow during the afternoon.
No LLWS is anticipated.

Long Term...Chances for showers increase Monday into Tuesday
that could bring periods of restrictions.

&&

.MARINE...
Short Term...Winds and seas to remain below SCA thresholds
through the period. Marine fog along with showers and isolated
thunderstorms will be possible today.

Long Term...Sub-SCA conditions. VSBY restrictions in showers
Tuesday/Wednesday.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...Flood Watch until 8 PM EDT this evening for NHZ007-008-011-012-
     015.
MARINE...None.

&&

$$

NEAR TERM...Baron/Tubbs
SHORT TERM...Tubbs
LONG TERM...Jamison/Tubbs