Heat in Massachusetts, June 23 to 24, 2025

AREA FORECAST DISCUSSION
National Weather Service Albany NY
642 AM EDT Mon Jun 23 2025

.SYNOPSIS...
Hot and humid conditions will start the week, with heat indices
reaching 105 to 110 degrees for many valley areas during the
afternoon hours. A cold front approaching from the north could
bring isolated thunderstorms mainly north of Interstate 90
Tuesday afternoon, with more widespread showers and
thunderstorms possible Wednesday through Friday along with
cooler temperatures.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Key Messages:

 - Dangerous heat today, with feels-like temperatures
   approaching 110 degrees in some valley areas this afternoon.

Discussion:

As of 330 AM EDT, areas of low/mid level clouds increasing for
areas near and west of I-87, in association with returning warm
front/old outflow boundary from last night/s convective complex.
Mid level capping has become very strong, so although isolated
showers may develop within this zone of low level warm
advection, the capping should prevent growth into thunderstorms.
Patchy/areas of fog will continue developing through daybreak
in areas where some breaks in the clouds occur. This band of
clouds should continue shifting eastward through daybreak,
reaching areas near and east of I-87.

After any low clouds/fog lift by mid morning, increasing
sunshine will lead to a very hot and humid day. Daytime max
temps should reach the mid/upper 90s in many valley areas except
90-95 within the Mohawk Valley. Dewpoints should reach the
lower/mid 70s, allowing for heat indices to reach 105-110
degrees for much of the Hudson River Valley, where Extreme Heat
Warnings remain in effect. Elsewhere, heat indices should reach
95-104 degrees this afternoon with the exception of the SW
Adirondacks, where heat indices should generally remain below
95.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY NIGHT/...
Key Messages:

 - Dangerous heat will continue Tuesday, with feels-like
   temperatures approaching 110 degrees in some valley areas.

 - A few potentially strong to severe thunderstorms possible Tuesday,
   mainly across the ADKs and upper Hudson Valley

Discussion:

Warm and humid conditions tonight with low temps only falling
into the lower/mid 70s for most valley areas, and 65-70 across
higher elevations. Patchy fog should develop in some areas
overnight.

Another very hot and humid day Tuesday, although dewpoints might
drop slightly compared to today (upper 60s/lower 70s in valley
areas during max heating). Still expect heat indices to reach
around 105 in much of the Hudson River Valley and 95-100
elsewhere, except lower 90s across the SW Adirondacks.

A cold front approaching from the north could trigger isolated
thunderstorms across the southern Adirondacks later in the
afternoon, perhaps reaching the Mohawk Valley, Lake
George/Saratoga region and southern VT toward or shortly after
sunset. Although coverage should remain limited, steep low
level lapse rates could allow for sporadic instances of
strong/damaging wind gusts within the strongest storms. Areas
near and north of I-90 have been placed within a Marginal Risk
for severe thunderstorms by SPC for this reason.

The front slowly settles southward Tuesday night into Wednesday.
This should allow for slight cooling along with lowering
dewpoints from north to south. Still muggy Tuesday night with
lows in the lower/mid 70s for most valley areas and mid/upper
60s across the southern Adirondacks. Highs Wednesday still
expected to reach the lower 90s across portions of the mid
Hudson Valley and southern Litchfield County, CT, with 85-90 in
most other valley areas and 80-85 across higher elevations. Max
heat indices may still reach the mid/upper 90s across the mid
Hudson Valley and across portions of Litchfield County, CT,
where an additional Heat Advisory may be needed. Elsewhere, max
heat indices in the 80s to lower 90s.

As the front will settles just south of the region, weak
disturbances riding along the front may bring isolated/scattered
showers/thunderstorms Wednesday afternoon/evening, especially
for areas south of I-90. Lows Wednesday night 65-70 in most
valley areas and 55-60 across the southern Adirondacks.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
Upper level zonal flow will be in place for much of the long
term period with some shortwaves occasionally passing through
the flow. At the surface, a series of low pressure systems look
to track near or through our region. This will result in nearly
daily chances for some showers and thunderstorms, pending on the
timing and track of each disturbance. The additional clouds and
rain chances will keep the heat suppressed to the south with
temperatures running close to normal (highs in the 70s and 80s
with lows in the 50s and 60s).

&&

.AVIATION /12Z MONDAY THROUGH FRIDAY/...
Through 12z/Tue...A ridge of high pressure will build across the
region through the TAF period bringing dry and hot weather. Mainly
VFR conditions are expected through the upcoming TAF period. The
exception will be for any lingering fog at KGFL/KPSF early this
morning, then some developing fog at the same sites tonight. Wind
will become westerly at 5-10 kt today (except southerly at KGFL).
Wind decreases to 5 kt or less tonight.

Outlook...

Tuesday Night: No Operational Impact. NO SIG WX.
Wednesday: Moderate Operational Impact. Scattered SHRA...TSRA.
Wednesday Night: Moderate Operational Impact. Scattered SHRA...TSRA.
Thursday: Moderate Operational Impact. Chance of SHRA...TSRA.
Thursday Night: Moderate Operational Impact. Chance of SHRA...TSRA.
Friday: Moderate Operational Impact. Chance of SHRA...TSRA.

&&

.CLIMATE...
Record high temperatures for June 23 and June 24:

June 23
Albany, NY: 96 degrees set in 1888
Poughkeepsie, NY: 94 degrees set in 1965
Glens Falls, NY: 95 degrees in 1894

June 24:
Albany, NY: 96 degrees set in 1943 Poughkeepsie, NY:
Poughkeepsie, NY: 94 degrees set in 2013
Glens Falls, NY: 95 degrees in 1914

&&

.ALY WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory from 11 AM this morning to 8 PM EDT Tuesday for
     CTZ001.
     Extreme Heat Warning from 11 AM this morning to 8 PM EDT
     Tuesday for CTZ013.
NY...Heat Advisory from 11 AM this morning to 8 PM EDT Tuesday for
     NYZ038>040-047-048-051-054-058-063.
     Extreme Heat Warning from 11 AM this morning to 8 PM EDT
     Tuesday for NYZ041-043-049-050-052-053-059>061-064>066-
     083-084.
     Heat Advisory from 11 AM this morning to 8 PM EDT this evening
     for NYZ042-082.
MA...Heat Advisory from 11 AM this morning to 8 PM EDT Tuesday for
     MAZ001-025.
VT...Heat Advisory from 11 AM this morning to 8 PM EDT Tuesday for
     VTZ013>015.

&&

SYNOPSIS...KL/Main
NEAR TERM...KL
SHORT TERM...KL
LONG TERM...Rathbun
AVIATION...Rathbun
CLIMATE...Speciale