Severe Thunderstorm Warning 43, NWS Boston/Norton, MA

588 
WWUS51 KBOX 082100
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
500 PM EDT Sat Aug 8 2026

MAC011-013-015-082145-
/O.CON.KBOX.SV.W.0043.000000T0000Z-260808T2145Z/
Hampshire MA-Franklin MA-Hampden MA-
500 PM EDT Sat Aug 8 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR HAMPSHIRE...CENTRAL FRANKLIN AND HAMPDEN COUNTIES...

At 459 PM EDT, severe thunderstorms were located along a line
extending from Savoy to Otis to near Norfolk, moving east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Law enforcement. At 430 PM law enforcement reported 
         numerous trees and power lines down in Lenox MA.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Springfield, Chicopee, Westfield, Holyoke, Amherst, Northampton,
Agawam, West Springfield, Greenfield, Deerfield, Ludlow, South
Hadley, Easthampton, Longmeadow, East Longmeadow, Southwick,
Montague, Granby, Southampton, and Hadley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4215 7307 4214 7305 4215 7303 4231 7300
      4231 7303 4233 7306 4238 7307 4238 7301
      4260 7296 4258 7251 4204 7252 4204 7305
      4210 7307 4212 7306
TIME...MOT...LOC 2059Z 270DEG 21KT 4257 7302 4222 7306 4205 7317 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

FT

257 
WWUS51 KBOX 082125
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
525 PM EDT Sat Aug 8 2026

MAC011-082134-
/O.CAN.KBOX.SV.W.0043.000000T0000Z-260808T2145Z/
Franklin MA-
525 PM EDT Sat Aug 8 2026

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FRANKLIN COUNTY IS
CANCELLED...

The storms which prompted the warning have weakened. Therefore, the 
warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western Massachusetts.

LAT...LON 4214 7306 4213 7305 4214 7303 4230 7300
      4231 7300 4231 7303 4233 7306 4238 7306
      4238 7301 4242 7300 4242 7298 4239 7252
      4204 7252 4204 7305 4205 7305 4209 7306
TIME...MOT...LOC 2124Z 270DEG 21KT 4258 7284 4223 7289 4206 7300 

$$

MAC013-015-082145-
/O.CON.KBOX.SV.W.0043.000000T0000Z-260808T2145Z/
Hampshire MA-Hampden MA-
525 PM EDT Sat Aug 8 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHWESTERN HAMPSHIRE AND HAMPDEN COUNTIES...

At 524 PM EDT, severe thunderstorms were located along a line
extending from near Buckland to near Montgomery to near Tolland,
moving east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Law enforcement.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Springfield, Chicopee, Westfield, Holyoke, Amherst, Northampton,
Agawam, West Springfield, South Hadley, Easthampton, Longmeadow, East
Longmeadow, Southwick, Granby, Southampton, Hadley, Hatfield,
Williamsburg, Huntington, and Russell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4214 7306 4213 7305 4214 7303 4230 7300
      4231 7300 4231 7303 4233 7306 4238 7306
      4238 7301 4242 7300 4242 7298 4239 7252
      4204 7252 4204 7305 4205 7305 4209 7306
TIME...MOT...LOC 2124Z 270DEG 21KT 4258 7284 4223 7289 4206 7300 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

FT

139 
WWUS51 KBOX 082138
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
538 PM EDT Sat Aug 8 2026

MAC013-015-082145-
/O.CON.KBOX.SV.W.0043.000000T0000Z-260808T2145Z/
Hampshire MA-Hampden MA-
538 PM EDT Sat Aug 8 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTH CENTRAL HAMPSHIRE AND CENTRAL HAMPDEN COUNTIES...

At 538 PM EDT, severe thunderstorms were located along a line
extending from near Buckland to near Montgomery to Granville, moving
east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Law enforcement.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Springfield, Chicopee, Westfield, Holyoke, Amherst, Northampton,
Agawam, West Springfield, South Hadley, Easthampton, Longmeadow, East
Longmeadow, Southwick, Granby, Southampton, Hadley, Hatfield,
Williamsburg, Huntington, and Russell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4214 7283 4223 7287 4220 7285 4230 7285
      4234 7286 4235 7284 4235 7283 4237 7284
      4238 7283 4241 7285 4239 7252 4204 7252
      4206 7286 4209 7285 4211 7284
TIME...MOT...LOC 2138Z 264DEG 21KT 4259 7274 4224 7279 4207 7290 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

FT

866 
WWUS51 KBOX 082146
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
546 PM EDT Sat Aug 8 2026

MAC013-015-082155-
/O.EXP.KBOX.SV.W.0043.000000T0000Z-260808T2145Z/
Hampshire MA-Hampden MA-
546 PM EDT Sat Aug 8 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL HAMPSHIRE AND
CENTRAL HAMPDEN COUNTIES HAS EXPIRED...

The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western Massachusetts.

Remember, a Severe Thunderstorm Warning still remains in effect for
southern Hampden County 

LAT...LON 4214 7283 4223 7287 4220 7285 4230 7285
      4234 7286 4235 7284 4235 7283 4237 7284
      4238 7283 4241 7285 4239 7252 4204 7252
      4206 7286 4209 7285 4211 7284
TIME...MOT...LOC 2145Z 270DEG 21KT 4259 7272 4224 7277 4207 7288 

$$
FT

Area Forecast Discussion
National Weather Service Boston/Norton MA
248 PM EDT Sat Aug 8 2026

.WHAT HAS CHANGED...
Forecast remains on track.

&&

.KEY MESSAGES...

- Diurnal shower and thunderstorm chances remain a threat today.
  Heat and humidity slowly trending down during Sunday. Dry
  weather expected Sunday.

- Next week trending not as hot and not as humid each day, and
  possibly slightly cooler than normal by Fri into next week.

&&

.DISCUSSION...
KEY MESSAGE 1...Diurnal shower and thunderstorm chances remain a
threat today. Heat and humidity slowly trending down during
Sunday. Dry weather expected Sunday.

Typical convective environment across southern New England this
afternoon. One of limited bulk shear and modest CAPE values.
Isolated thunderstorms already developed across portions of
northern MA, with more across eastern NY state. The greatest
risk for stronger thunderstorms will be across western MA and
CT. Still thinking this risk will diminish after sunset,
although thunderstorms could still persist into the later
evening. The greatest threat would be straight-line wind damage.

Drier weather anticipated for Sunday. Favored the lowest dew
point guidance due to expectation of a W wind across the
interior. That said, still thinking it will take into the
afternoon before dew points reach the lower 60s to upper 50s
across the interior. Towards the Cape and islands, dew points
should struggle to get much below 70 until some time Sunday
night.

KEY MESSAGE 2...Very warm and humid weather continues through
Wednesday. Daily shower and storm chances each day too, but
lesser of a chance Sunday.

Overall pretty persistent summer weather pattern really right
through Wednesday, with enhanced quasi-zonal flow in mid levels
interacting with summerlike temperatures and humidity levels.

Warm temperatures and elevated but not really oppressive
humidity levels (dewpoints in the mid to upper 60s) can be
expected to continue through Wednesday. General sameness to
925-850 mb temps each day, only slightly cooling by a degree or
two from Sunday through Wednesday, which supports highs in the
mid/upper 80s and heat indices in the lower to middle 90s. While
not necessarily a hazardous combo of heat and humidity and most
are already acclimatized to the summer warmth, thus not looking
at headline- level heat, it is still an extended spell of heat
indices in the low to mid 90s, so still continue to adequately
hydrate and take breaks in cooler spaces.

With westerly mostly non-convergent low-level flow and modest
height rises Sunday, Sunday should end up being a generally dry
day as will be tough to get enough lift to spark storms.
Otherwise, daily shower and thunderstorm chances again resume
for early to mid next week, and with somewhat stronger flow, a
couple of those storms could become strong or severe in this
timeframe. The issue is timing the storms out, as has been the
case most of this week; this is very challenging as any ripple
in the faster mid-level flow could focus better storm chances
given the warm and humid weather. At this forecast time horizon
timing specific day(s) have more storm chances than others is a
tough ask. Won't be raining and thundering all the time but
there will be storms to dodge here-and-there.

Tough to find many areas to improve upon NBM so stayed fairly
close to outputted NBM forecast values during this period.

KEY MESSAGE 2...Next week trending not as hot and not as humid
each day, and possibly slightly cooler than normal by Fri into
next week.

Hudson Bay vortex slowly digs southeast through Ontario and
Quebec next week, and in the process, advects numerous short
waves into SNE. Each short wave will slowly erode the northwest
periphery of the western Atlantic subtropical ridge over SNE.
This will result in a risk of scattered showers/thunderstorms
each day through Thu. Although, not expecting a washout with
many hours of dry weather each day. Hence, a typical mid August
week for SNE. In addition, each short wave passage will result
in temps and humidity coming down a notch each day. Thus, the
week will begin with warmer than normal temps along with dew pts
in the 60s. Then finish the week with temps at or slightly
cooler than normal by Fri, along with dew pts in the 50s!

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

Through Tonight: Overall high confidence, but lower on TSRA
timing.

Mainly VFR. Still some uncertainty in timing of TSRA at specific
terminals. Handled most with a PROB30. TSRA dissipates late this
evening. South-coastal IFR fog/stratus returning, with VFR
elsewhere.

Sunday and Sunday Night: High confidence.

VFR. General W to SW winds prevail.

KBOS Terminal...Moderate confidence.

Monitoring for TSRA this aftn/evening. Best estimate in TAF, but
cannot dismiss the idea of an earlier start.

KBDL Terminal...Moderate confidence.

Monitoring for TSRA this aftn/evening. Best estimate in TAF, but
cannot dismiss the idea of an earlier start.

Outlook /Monday through Thursday/...

Monday: VFR.

Monday Night: VFR. Slight chance SHRA.

Tuesday through Wednesday: VFR.

Wednesday Night: VFR. Slight chance SHRA.

Thursday: VFR. Breezy. Chance SHRA, slight chance TSRA.

&&

.MARINE...
Forecaster Confidence Levels...

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

Through Sunday Night... High Confidence.

High pressure remains positioned off of the east coast. This
will continue to produce a SW flow across the waters this
weekend. Gusts to 20 kts possible over the southern waters
today, but should remain under SCA levels.

Outlook /Monday through Thursday/...

Monday: Winds less than 25 kt.

Monday Night: Winds less than 25 kt. Slight chance of rain
showers.

Tuesday: Winds less than 25 kt.

Tuesday Night: Winds less than 25 kt. Slight chance of rain
showers, slight chance of thunderstorms.

Wednesday: Winds less than 25 kt.

Wednesday Night: Winds less than 25 kt. Slight chance of rain
showers.

Thursday: Winds less than 25 kt. Chance of rain showers.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.

&&

DISCUSSION...Belk/Nocera
AVIATION...Belk/Nocera
MARINE...Belk/Nocera