BOX issues Area Forecast Discussion (AFD) at Jul 8, 1:30 PM EDT219
FXUS61 KBOX 081730
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
130 PM EDT Wed Jul 8 2026
.WHAT HAS CHANGED...
The Small Craft Advisory for the outer waters has been extended
until 8 pm this evening.
&&
.KEY MESSAGES...
- Dry and warm today with sea breezes possible along the east coast.
- Becoming warmer with increasing humidity Thursday and Friday.
Chance for showers and thunderstorms, mainly on Friday.
- Much drier and cooler this upcoming weekend as a cooler
airmass settles in.
&&
.DISCUSSION...
KEY MESSAGE 1... Dry and warm today with sea breezes possible along
the east coast.
High pressure settles in for Wednesday with dry and clear conditions
building in for the entire CWA by the afternoon. Could see some
lingering patches of fog along the Cape and Islands with some patchy
low level moisture. Expecting any fog to quickly mix out this
morning with mid level RH values falling to 5-10%. Expect a dry and
clear day with seasonable temperatures in the upper 70s and low 80s.
Winds will be light out of the N/NW with sea breezes possible along
the east coast.
KEY MESSAGE 2...Becoming warmer with increasing humidity Thursday
and Friday. Chance for showers and thunderstorms, mainly on Friday.
Broad WSW flow brings warmer and increasingly humid conditions
Thursday and Friday. The warm and humid airmass pairs with a weak
disturbance arriving from the Ohio Valley to bring a risk for
scattered showers and thunderstorms mainly to portions of Southern
New England later Thursday into Thursday night. CSU machine learning
probs still highlight the greatest chance for severe weather over
the Mid Atlantic
Ensemble guidance continues to show a better potential for
thunderstorms on Friday with a cold front moving into southern New
England later in the day. the front moves into a moist unstable
airmass marked by dew points in the upper 60s to low 70s. In terms
of instability, the NBM shows a 40-60% chance for CAPE values
>1000J/kg across the interior. That said, the risk of severe weather
is still quite low with poor middle-tropospheric lapse rates leading
to tall-skinny CAPE profiles and deep layer shear in the 30 kt
range.
Higher confidence in warm, humid weather both days with highs in the
mid 80s to lower 90s, supporting heat indices in the mid 90s to
mid/upper 90s, more likely falling short of heat headlines.
KEY MESSAGE 3...Much drier and cooler this upcoming weekend as a
cooler airmass settles in.
For the weekend the 500 mb pattern transitions to one of cyclonic
flow/troughing in the mean, which favors cooler temperatures (low to
mid 80s) and lower humidity levels. Weekend appears favorable for
outdoor plans with nice summer weather. We'll be on the western
periphery of a pretty impressive upper level ridge of nearly 600 dm
building over the northern/central Plains and upper Midwest. We
could have to keep an eye on possible storminess pivoting around the
ridge but it looks as though the weekend ends up drier than not.
&&
.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18Z TAF Update:
Wednesday...High confidence.
VFR. Light and variable winds away from the south coastal
terminals, except a seabreeze at BOS until 00-02z. FEW-SCT cloud
deck around 4kft
Wednesday night...High confidence.
VFR. SW winds 5-10 kts.
Thursday...High confidence.
VFR. SW winds 8-12 kts with gusts 20-25 kts. Isolated shower or
thunderstorm possible after 20Z.
KBOS Terminal...High confidence.
KBDL Terminal...High confidence in TAF.
Outlook /Friday through Monday/...
Friday: VFR. Chance SHRA, chance TSRA.
Friday Night: VFR. Slight chance SHRA.
Saturday through Sunday Night: VFR.
Monday: VFR. Breezy.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Thursday Night...High confidence.
SCA conditions continue in the the coastal waters through the
day today with NE wind gusts around 25 kts. Conditions improve
overnight into Thursday as high pressure builds over the region.
A weak front approaches the region later Thursday with showers
and thunderstorms possible over the southern waters.
Outlook /Friday through Monday/...
Friday: Winds less than 25 kt. Slight chance of rain showers.
Friday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers.
Saturday: Winds less than 25 kt. Areas of seas approaching
5 ft.
Saturday Night through Monday: Winds less than 25 kt.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents until 11 PM EDT this evening for MAZ007-
014>016-019-022-024.
RI...None.
MARINE...Small Craft Advisory until 8 PM EDT this evening for ANZ250-
254-255.
&&
$$
DISCUSSION...Loconto/McMinn
AVIATION...Loconto/McMinn
MARINE...Loconto/McMinn
Source:
BOX issues Area Forecast Discussion (AFD) at Jul 8, 1:30 PM EDT----------------
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