The remnants of Hurricane Debby moved through southern New England in the evening causing a smattering of damaging wind reports in western Massachusetts.
Every event with a place to put it; 8 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BOX wrote it up.
The remnants of Hurricane Debby moved through southern New England in the evening causing a smattering of damaging wind reports in western Massachusetts.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boston/Norton, MA wrote its last area forecast discussion before the first event at Aug 9, 2:54 PM EST, 30 minutes earlier.
Area Forecast Discussion
National Weather Service Boston/Norton MA
354 PM EDT Fri Aug 9 2024
.SYNOPSIS...
The remnants of Debby continue to pass well to the west, but
bring the threat for heavy rain and severe weather this
afternoon and evening. Rain moves offshore Saturday morning with
clear skies following behind. We then enter into an extended
spell of pleasant midsummer weather with seasonable temperatures
and low humidity levels starting Sunday into the middle of next
week. Other than a limited risk for showers or thundershowers
Monday into early Monday evening, dry weather
&&
.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
Key Point
* Tornado Watch in effect until 10PM this evening for Western MA and
CT
The remnants of tropical storm Debby continue to march North over
western PA and NY with a warm front extending east into MA. With the
warm front now moving into northern MA, the environment behind is
becoming more supportive of tropical tornadoes especially across
western MA and CT. With some sun able to break out along the
South Shore, surface instability has built up to 2000-3000J/kg
per SPC meso analysis. The parameters we will need to keep a
close eye on this afternoon and evening are the 0-3km Cape and
0-500 SRH. The 0-3km Cape values have built to 100-150 J/kg and
0-500 SRH approaching 200 m/s^2 which is favorable for weak
tornadoes in a tropical environment. LCL heights between
500-750m are also favorable for tornadoes. The only limiting
factor is that the greatest forcing for thunderstorms will
remain in eastern NY closer to the triple point of remnant low
from Debby. The greatest threat for Tornadoes is across western
MA and CT, with a lesser threat as you move east into eastern MA
and RI. Timing of the tornado threat is highest from 4-8pm.
It's important to stress that these types of circulations, while
potentially supportive of tornadoes, tend to be very shallow in
nature and do not last very long and may not even produce lightning.
Radar detection can be difficult especially at farther distances
from the radar. These situations are usually handled by issuing
Severe Thunderstorm Warnings with the "Tornado Possible" tag since
it is difficult to track these transient couplets. However, any
longer-lived couplets that do manage to form can be handled with
Tornado Warnings.
The threat for flash flooding continues to look marginal with the
bulk of the QPF falling in western NY. Quick heavy downpours are
likely with any convective showers with PWATS around 1.7 inches and
warm cloud depths close to 15kft. Showers will be moving very
quickly this afternoon, however, training is already being observed
on radar which could bring a localized flash flood threat.
Showers begin to push east overnight as a weak cold
front/surface trough pushes through. With the loss of diurnal
heating, the tornado threat should diminish after 10pm. There
will likely be some heavy downpours overnight as showers move
east and PWATS remain at 1.7 inches. Winds tonight will be
quite gusty ahead of the frontal passage with gusts approaching
30-40mph. Overnight lows stay well above normal into the low to
mid 70s.
&&
.SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/...
Remaining showers move offshore by the lunchtime hour with clearing
conditions expected behind. Winds also quickly diminish in the
morning, but remain blustery out of the west at 10-15mph. High temps
tomorrow rebound into the mid to upper 80s, however, dewpoints will
be falling rapidly from the mid 70s we saw today, into the upper 50s
to low 60s. Clear and calm conditions continue into saturday night
as weak high pressure builds in. With clear skies and calm winds
overnight, temps overnight should drop into the upper 50s to low 60s.
&&
.LONG TERM /SUNDAY THROUGH FRIDAY/...
Highlights:
* Seasonable temperatures and lower humidity going into Friday.
* Diurnal chances for showers and storms, especially on Monday.
Mostly dry throughout otherwise.
Details:
Not much change from the last update. Cyclonic flow aloft begins to
move in and dominate this period behind a shortwave coming through
New England from the Great Lakes region. Latest guidance looking
pretty confident and showing it to be mostly dry with most of
our chances at rain to be some scattered daytime showers
showing up throughout the week, especially Monday.
The primary disturbance to watch is the shortwave coming from the
eastern Great Lakes region that looks to progress through New
England on Monday. Most rain chances then still look relegated to
the interior of MA along with northern CT into NW RI going into
Monday night, but I wouldn't rule out any chances for showers
along the South Coast.
Low precipitation chances are present during the afternoon into
evening hours for Wednesday, Thursday, and Friday with the presence
of diurnal clouds. These are also primarily in interior MA, northern
CT, and NW RI, ranging from 15-25% chance for showers and storms.
Overnight hours throughout this period look to remain relatively
quiet. Temperatures look to be comfortable in the lower 80s and
upper 70s for much of the week, with dew points staying solidly
in the 60s and upper 50s across SNE.
&&
.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update: Moderate Confidence.
Warm front lifts north of region through mid afternoon. IFR/LIFR
north of front rapidly gives way to MVFR or even VFR in its wake
along with gusty S winds to 25-30kt. Expectation is for IFR
ceilings to return this evening with LIFR closer to Cape Cod
and Islands. During this time frame, we will see fast-moving
showers moving through region that could briefly reduce
visibility to 2-3SM.
Main time frame for showers is overnight through early Sat
morning. Best chance of TSRA is in western MA and N CT,
including BAF/BDL, roughly from 22z through 02z.
Conditions gradually improve Sat morning to MVFR as winds veer
to SW and diminish to 10-15kt. Should see clouds scatter out by
midday or early afternoon with VFR conditions lasting into Sat
night.
KBOS TAF...Moderate confidence. Onset of IFR cigs may be +/-
2 hours. Low chance of TS overnight so not included in TAF but
main time frame would be around 03-05z Sat.
KBDL TAF...Moderate confidence. Onset of IFR cigs may be +/-
2 hours.
Outlook /Sunday through Wednesday/...
Sunday through Tuesday Night: VFR.
Wednesday: Slight chance SHRA.
&&
.MARINE...
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Gale warning continue until 8am Saturday morning for much of
the southern waters including Nantucket and Vineyard sounds.
Winds will gust out of the south at 30-40 knots this evening
into early tomorrow morning. Winds quickly diminish after 8am
down to 10-20 knots. Small craft advisories will likely be
needed after 8am as wave heights overnight build to 5-10 feet
and remain elevated into Saturday evening. Seas are expected to
diminish below 5 feet for all the coastal waters by Sunday
morning.
For the beaches/surf zone...
Rip current statement for this afternoon and High Surf Advisory
for Saturday remain in effect. Building seas of 5-10 feet
across the open waters will bring dangerous breaking wave and
rip currents to all of the south facing shores and outer Cape
Cod. Take extra caution if heading to the beach tomorrow.
Outlook /Sunday through Wednesday/...
Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.
Sunday Night through Wednesday: Winds less than 25 kt.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents until 8 PM EDT this evening for
MAZ020>024.
High Surf Advisory from 8 PM this evening to 8 PM EDT Saturday
for MAZ020>024.
RI...High Risk for Rip Currents until 8 PM EDT this evening for
RIZ006>008.
High Surf Advisory from 8 PM this evening to 8 PM EDT Saturday
for RIZ006>008.
MARINE...Small Craft Advisory until 8 AM EDT Saturday for ANZ230-231-
236-251.
Gale Warning until 8 AM EDT Saturday for ANZ232>235-237-
254>256.
Small Craft Advisory until 2 PM EDT Saturday for ANZ250.
&&
SYNOPSIS...CH/KP
NEAR TERM...KP
SHORT TERM...KP
LONG TERM...CH
AVIATION...JWD
MARINE...KPThe national radar mosaic for the moment the first event began.
8 strong wind. Local standard time, as filed.
In Orange, a tree fell on 3 people causing injuries. Reported by amateur radio.
In Goshen, multiple trees were down on Fuller Rd.
In Sunderland, a tree and wires were down on North Main St.
In Millers Falls, a tree was down on West Mineral Rd.
In Cummington, a tree was down on Dodwells Rd.
In West Springfield, a branch 6 inches in diameter was downed.
In Blandford, a tree was down on North St.
In Huntington, a tree was down on wires.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Massachusetts in 2024Every state in 2024This day in weather historyWarnings in Massachusetts, August 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1195478, 1195479, 1195480, 1195481, 1195482, 1195483, 1195484, 1195485.