BOX issues Area Forecast Discussion (AFD) at Sep 16, 3:06 PM EDT893
FXUS61 KBOX 161906
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
306 PM EDT Wed Sep 16 2026
.WHAT HAS CHANGED...
No significant changes to the forecast.
&&
.KEY MESSAGES...
- Increased humidity and warmer temperatures continue tomorrow.
- Scattered showers possible Thursday evening into Friday
morning.
- Rain chances return for the second half of the weekend. There
remains uncertainty in the details such as coverage, timing,
amounts.
&&
.DISCUSSION...
KEY MESSAGE 1...Increased humidity and warmer temperatures
continue tomorrow.
Warmer temperatures with increased humidity continue into tomorrow
as an anomalous moisture plume and higher 925 mb temperatures advect
into southern New England via SW flow. Looking ahead into tonight,
the increased moisture and winds dropping off in the interior may
favor the development of some patchy fog, especially in the CT
Valley. With 925 mb temperatures reaching around 16-19C in the
afternoon Thursday, high temperatures in the low 80s are a
possibility, especially in the river valleys. These higher low level
temperatures remain over the region overnight as well with high
pressure affixed just to our south continuing SW flow; lows tonight
will likely only drop into 60s as opposed to the areas of 50s and
40s we've seen the past few nights. PWATs up to 2.0" and dewpoints
in the upper 60s will make it feel more humid, too. Despite the
increased humidity, the region should remain dry for much of the day
tomorrow.
KEY MESSAGE 2...Scattered showers possible Thursday evening
into Friday morning. Dry during the day Friday.
A weak shortwave trough progresses eastward behind the plume of
moisture, which will aid in the development of scattered showers
across southern New England. As previously mentioned, latest
guidance has shown PWATs reaching ans even exceeding 2.0" Thursday
afternoon/evening. However, we are not anticipating widespread
downpours as guidance continues to track the stronger forcing across
northern parts of New England. Global models and a number of the
CAMs (with the exception of the NAM) are in agreement that higher
rainfall totals should generally remain to our north, and ensemble
probabilities also favor this outcome. Totals across southern New
England should primarily range between 0.1" to 0.3" based on the
more northern track of the wave. The latest CAMs have still shown
some elevated instability Thursday night, so a low chance of some
isolated downpours cannot be completely ruled out. Totals could also
increase slightly if the wave were to end up tracking a little
further south, but the general consensus is that the greatest
forcing will remain to our north and we could generally expect a few
tenths of an inch.
Following this system, drier air pushes back in with NW flow, which
will aid in clearing skies through the day and bringing temperatures
back to a more seasonable range.
KEY MESSAGE 3... Rain chances return some time late Saturday night
into Monday morning. There remains uncertainty in the details such
as coverage, timing, amounts.
A high pressure should move across northern New England Saturday,
then over the North Atlantic Sunday. This should clear the path for
a low pressure to move from the lower Great Lakes south of New
England late some time late Saturday night into Monday. This will
likely be our next period of rainfall. However, the timing is not
yet finalized, especially with a high pressure over the ocean. Would
not be surprised if a slower timing develops.
There is also a question about how much rainfall we can expect
across our region. High pressure over eastern Canada may nudge far
enough south to pus the ultimate storm track far enough south where
we could wind up dry Tuesday into Wednesday. Assuming this occurs,
total rainfall amounts could be limited to a general 1-2 inches by
Monday afternoon. Otherwise, with a nearly stationary front close to
the south coast of New England could trigger some showers right into
mid week.
&&
.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update...
Through Tonight...High confidence.
VFR outside of areas of patchy fog, where MVFR/IFR visibilities
are possible. SW winds near 8-12 kts, with the higher end of
the range towards the Cape and Islands. Winds become lighter to
even calm for some areas in the interior tonight. Patchy fog in
the valleys and other terminals that often see fog (ORH, BED
mainly) may develop in the early morning hours between 08z and
12z, burning off quickly after sunrise. Mid- level cloud deck
begins to move in overnight into early Thursday morning.
Thursday...Moderate confidence.
VFR with areas of MVFR developing in the early afternoon/late
morning hours. Winds at 5-10 kt, shifting more S to SE across
the region towards 17z for most. Some could see winds more SSW,
particularly for Cape and Island terminals. Showers may start to
move into the region in the afternoon hours from W to E, with
chances continuing to increase through the evening.
Thursday Night...Moderate confidence.
MVFR with areas of IFR. Showers push across the region, clearing
towards Friday morning, though MVFR conditions could linger a
bit over the Cape and Islands. Winds generally at 5-10 kt from
the SW, shifting NW towards Friday morning.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Friday through Monday/...
Friday: VFR.
Friday Night: VFR. Breezy.
Saturday: VFR.
Saturday Night: VFR. Chance SHRA.
Sunday: Mainly VFR, with areas MVFR possible. Breezy. SHRA
likely.
Sunday Night through Monday: VFR. Breezy. Chance SHRA.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Thursday night...High confidence.
High pressure continues along with SW winds at 10-15 kt into
tomorrow. Gusts just under 20 kt are possible in the afternoon
and evening hours. Chances for showers over the waters increase
Thursday night, especially for northern parts of the eastern
waters. Seas remain at 2-3 ft, though areas of the southern
waters may approach 4 ft heading into Friday morning.
Outlook /Friday through Monday/...
Friday: Winds less than 25 kt. Seas locally approaching 5 ft.
Slight chance of rain showers.
Friday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of seas approaching 5 ft.
Saturday: Winds less than 25 kt. Areas of seas approaching
5 ft.
Saturday Night: Winds less than 25 kt. Seas locally approaching
5 ft.
Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers.
Sunday Night: Winds less than 25 kt. Areas of seas approaching
5 ft. Chance of rain showers.
Monday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Seas up to 5 ft. Chance of rain showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.
&&
$$
DISCUSSION...Belk/Hrencecin
AVIATION...Belk/Hrencecin
MARINE...Belk/Hrencecin
Source:
BOX issues Area Forecast Discussion (AFD) at Sep 16, 3:06 PM EDT----------------
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