Flash Flood Warning 47, NWS Boston/Norton, MA

334 
WGUS71 KBOX 292204
FFSBOX

Flash Flood Statement
National Weather Service Boston/Norton MA
604 PM EDT Sat Jul 29 2023

MAC021-292214-
/O.CAN.KBOX.FF.W.0047.000000T0000Z-230729T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Norfolk MA-
604 PM EDT Sat Jul 29 2023

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN NORFOLK 
COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

A Flood Watch remains in effect until 1100 PM EDT for portions of 
northern Connecticut. Portions of Massachusetts. Portions of Rhode 
Island.

LAT...LON 4236 7125 4244 7101 4243 7100 4243 7098
      4244 7098 4231 7091 4228 7102 4229 7102
      4229 7101 4230 7101 4230 7099 4231 7099
      4230 7102 4230 7104 4229 7104 4228 7104
      4229 7117

$$

MAC017-025-292245-
/O.CON.KBOX.FF.W.0047.000000T0000Z-230729T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex MA-Suffolk MA-
604 PM EDT Sat Jul 29 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM EDT THIS 
EVENING FOR SUFFOLK AND EAST CENTRAL MIDDLESEX COUNTIES...

At 604 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Flash flooding is ongoing or expected 
to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Boston, Cambridge, Quincy, Newton, Somerville, Waltham, Malden, 
  Brookline, Medford, Revere, Everett, Chelsea, Watertown, Saugus, 
  Belmont and Winthrop.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4236 7125 4244 7101 4243 7100 4243 7098
      4244 7098 4231 7091 4228 7102 4229 7102
      4229 7101 4230 7101 4230 7099 4231 7099
      4230 7102 4230 7104 4229 7104 4228 7104
      4229 7117

FLASH FLOOD...RADAR INDICATED

$$

RM

843 
WGUS51 KBOX 292238
FFWBOX
MAC017-025-300045-
/O.EXT.KBOX.FF.W.0047.000000T0000Z-230730T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
638 PM EDT Sat Jul 29 2023

The National Weather Service in Norton has extended the

* Flash Flood Warning for...
  Suffolk County in eastern Massachusetts...
  East Central Middlesex County in northeastern Massachusetts...

* Until 845 PM EDT.

* At 638 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Boston, Cambridge, Quincy, Newton, Somerville, Waltham, Malden, 
  Brookline, Medford, Revere, Everett, Chelsea, Watertown, Saugus, 
  Belmont and Winthrop.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4236 7125 4244 7101 4243 7100 4243 7098
      4244 7098 4231 7091 4228 7102 4229 7102
      4229 7101 4230 7101 4230 7099 4231 7099
      4230 7102 4230 7104 4229 7104 4228 7104
      4229 7117

FLASH FLOOD...RADAR INDICATED

$$

RM

Area Forecast Discussion
National Weather Service Boston/Norton MA
418 PM EDT Sat Jul 29 2023

.SYNOPSIS...
Another round of strong to severe thunderstorms and flash
flooding is possible this afternoon and early evening, as a
cold front slides through. Much more comfortable airmass behind
the front for Sunday and remains in place through much of the
week. A frontal system will bring more showers and perhaps a few
thunderstorms late in the week.

&&

.NEAR TERM /THROUGH THIS EVENING/...

415 PM Update...

* Severe Thunderstorm Watch until 9 PM for all of SNE
* Isolated threat for damaging winds and flash flooding
* Heat advisory remains in effect

Isolated severe storms affecting the region this afternoon as
short wave energy in the WNW flow induces heights falls/forcing
for ascent across SNE. Deep layer shear is very robust with
effective bulk shear around 50kts! However, it appears
convection is not more widespread as instability is somewhat
marginal. Despite SB CAPEs up to 2000 j/kg, 100 MB mixed layer
CAPE is only 500 j/kg, suggesting instability is very shallow!
Greatest 0-3 km CAPE is farther to the north and west, with axis
up to 200 j/kg from southwest ME to central NH/VT into NYS and
PA. As this CAPE slowly advects eastward late this afternoon and
evening, combined with height falls, expect convection across
NYS to move across SNE between 22z-02z. Thus, convection should
become more widespread during that time, however strong to
severe storms probably more isolated as instability wanes with
sunset. Nonetheless, isolated severe storms with damaging winds
and flash flooding the greatest threat. Other limiting factor is
strongest forcing for ascent appears to be across central New
England, closer to the RRQ of upper level jet streak. This
stronger forcing likely stays north of SNE. Nevertheless, severe
thunderstorm watch remains in effect until 9 PM.

We will keep the heat advisory going given no relief until
FROPA/wind later this evening. Despite cloud cover and
convection limiting temps to the 80s at 4 pm, dew pts of 70-75
yielding heat indices in the low to mid 90s.

&&

.SHORT TERM /12 AM OVERNIGHT THROUGH SUNDAY NIGHT/...

415 PM Update:

Overnight...

Convection should exit Cape Cod/Nantucket around midnight
followed by FROPA/wind shift to the N-NE. Winds gusty behind the
front 15-20 mph, gusting up to 25 kts across Cape Cod and the
Islands will usher in a refreshing change in airmass, with dew
pts crashing from 70-75 this evening, falling into the 50s
overnight, except falling into the 60s Cape Cod and Islands. Low
clouds will accompany the N-NE wind shift but clearing towards
sunrise Sunday as winds become more NNW. The exception will be
Cape and Islands where low clouds will persist. Low temps by
daybreak, in the mid to upper 50s northwest of I95, 60-65
elsewhere.

Sunday...

Dramatic change in airmass with PWATs going from 2 inches today
to 0.75 to 0.50 inches Sunday! This will mix to the surface
with dew pts in the 50s. Just gorgeous weather for late July,
with mostly sunny conditions, highs 75-80, very comfortable
humidity. Gusty NNW winds 15-20 mph in the morning become and
light northwest in the afternoon. Local seabreezes possible
given the weakening pressure gradient.

Sunday night...

Dry WNW flow aloft combined with 1020 mb high over the Great
Lakes advecting eastward toward SNE, will provide dry, tranquil
weather and a touch of fall to the airmass with lows in the 50s!
Lows around 60 in the urban areas of Worcester, Hartford and
Providence, low 60s for Boston.

&&

.LONG TERM /MONDAY THROUGH SATURDAY/...

415 PM update...

Given the expected severe weather for the afternoon, have just
updated the long term gridded database using the most recent 13z NBM
guidance. With no significant changes within the long range computer
model guidance, the discussion written by the previous shift is
still applicable.

Highlights

* A cooler and much more comfortable airmass moves in Sun. This
  remains in place for much of the upcoming week.

* Spotty showers on Mon and Tue. Better shot for more widespread
  showers/t-storms comes late in the week.

Sunday through Tuesday...

Stuck under cyclonic flow through this timeframe. A subtle shortwave
swings through New England on Sun. Another shortwave lifts through
by early Mon. After this shortwave lifts through we are stuck under
a broad trough through Tue. A weak high nudges in on Sun. Late on
Sun into Mon a sfc trough extends into the south coast from an area
of low pressure off the Carolinas coast. A cold front slides through
later on Mon into early Tue. High pressure starts nudging in a bit
more late on Tue.

Will be significantly cooler and less humid Sun and as we head into
the work week. Winds generally remaining out of the NNW to NW at 925
hPa. This keeps roughly 15-20 degree C temps at that same level
through this period. The end result will be high temps topping out
in the mid 70s to the mid 80s. Dew points will be lowering into the
50s for most through much of this period. The only exception is
across the immediate south coast and perhaps portions of the eastern
coastline where low/mid 60 dew points linger into late Mon.

Despite the shortwave lifting through on Sun am thinking that we
should remain dry. Will have a mid level ridge building across the
eastern Great Lakes/Upstate NY and with drier WNW/NW flow along with
lowering PWATs it could be difficult to get any shower activity.

Will have better chances of spotty to perhaps scattered shower
activity during the Mon/Tue timeframe. Did bump up precip chances
late Sun into early Mon. Appears that we will have a weak
trough/boundary in place across the south coast. This in combination
with an upper trough digging in from the Great Lakes could generate
isolated shower activity, especially given the low/mid 60 degree dew
points still in place. May be lacking the deeper moisture though
with PWATs around 1 inch. Better chances for showers later on Mon
especially as a cold front slides into/through the region. Will also
see 500 hPa temps cool to roughly -15 to -20 degrees C, which is
quite anomalous for this time of year. Both the NAEFS and EPS
guidance SATA tables show this being roughly 2-3 STD below model
climo, which continues into Tue. This in combination with diurnal
heating should lead to isolated/scattered showers on Mon, with the
best shots across the interior. Similar set up on Tue, but think
the focus will be more along mesoscale boundaries, such as the sea
breeze. Despite these chances think overall it will be dry for most
and a washout is most definitely not anticipated.

Wednesday and Thursday...

Broad cyclonic flow/trough lifts offshore on Wed and a ridge axis
builds into the central/eastern Great Lakes. The ridge builds
overhead on Thu and begins to shift to our NE by late in the day,
while another trough digs into the Ontario/Great Lakes region. High
pressure builds overhead on Wed and moves offshore Wed into Thu. A
frontal system begins sliding into the eastern Great Lakes on Thu.

Dry and quiet weather expected through the vast majority of this
period. Did dial back the precip chances on Thu given the latest
suite of guidance has us dry, which was not captured well by the
NBM. Suspect we will need to continue to dial back those precip
chances on Thu. Did lower temps Tue night into Wed toward the 20th
percentile of guidance as am anticipating strong radiational
cooling. Will feel much cooler with lows generally in the 50s, but
there will be a few spots across NW MA that are in the upper 40s!
High temps on Wed will generally be in the 70s.

Should start to see the temps/dew points climbing on Thu as we get
into more southerly flow ahead of our next system. Anticipate that
925 hPa temps will be in the 15-20 degree range, so highs should
solidly be in the mid 70s to mid 80s. Dew points will begin climbing
into the upper 50s to lower 60s.

Late Thursday through Friday Night...

Still seeing significant timing and intensity differences with the
trough swinging through late in the week. This feature will bring us
our next opportunity for more widespread showers and perhaps some t-
storms as a frontal system moves through.

Given the spread amongst guidance have just stuck with the NBM at
this point. Quite difficult to pin point the specifics with regards
to severe weather this far out. We do have increasing deep layer
shear and forcing, but the mitigating factor may be the instability
that we realize. At this moment ensembles prog a roughly 30-50
percent chance of CAPE AOA 500 J/kg and low probs of CAPE AOA 1000
J/kg. Will just have to see how things evolve as the week
progresses, but given these probs have just an isolated mention of
thunderstorms at this point.

&&

.AVIATION /20Z SATURDAY THROUGH THURSDAY/...
Forecast Confidence Levels:

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

1815z update...

* Strong to severe thunderstorms possible until 01z

Thru 00z...moderate confidence on trends, lower on exact timing
and details.

Scattered TSRA across the region with MVFR conditions in these
storms. A few of the stronger storms will have a strong/damaging
wind threat along with torrential rainfall. This threat lingers
until about 01z, earlier northwest MA, longer for Cape Cod and
Islands. Away from these storms VFR with modest SSW winds.

After 00z...high confidence on trends, lower on exact timing and
details.

Storms at 00z mainly confined to CT/RI and southeast MA, then
finally exiting offshore after 03z/04z with improving
conditions. Behind the storms winds shift from SW to north and
become gusty, up to 20 kt or so. MVFR conditions behind the
front with the wind shift to the north, but dry weather
expected.

Sunday...high confidence.

MVFR possible early with north wind, but as wind becomes NNW
trend will be for VFR.

Sunday night...high confidence.

KBOS TAF...Moderate confidence on trends, lower on exact timing
and details. Scattered thunderstorms until about 02z. The
strongest storms will have the potential for wind gusts greater
than 50 kt and flash flooding. MVFR conditions in these storms.
Otherwise, VFR with E-SE winds. Storms move offshore after 02z,
but then a wind shift to the N-NE will result in MVFR cigs. Then
around 09z, wind shift to the N-NW should result in trends
toward VFR.

KBDL TAF...Moderate confidence on trends, lower on exact timing
and details. Scattered thunderstorms until about 00z. The
strongest storms will have the potential for wind gusts greater
than 50 kt and flash flooding. MVFR conditions in these storms.
Otherwise, VFR with light S-SW winds. Storms exit after 00z,
with a wind shift to the north and gusty. MVFR cigs likely
accompany this wind shift, and then toward 09z winds shift to
NNW along with VFR.

Outlook /Monday through Thursday/...

Monday through Tuesday: VFR. Slight chance SHRA.

Tuesday Night through Wednesday: VFR.

&&

.MARINE...
Forecaster Confidence Levels:

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

415 PM update...

* SCA for gusty NNE winds later this evening and overnight

This evening...

Scattered thunderstorms this evening with a few strong to severe
storms. Strongest storms may have wind gusts of 50+ kts and very
heavy rainfall. Otherwise, SW winds 15-20 kt, gusting up to 25
kt at times.

Overnight...

Cold front moves across the waters with a wind shift to NNE
15-20 kt, gusting up to 25 kt at times. Thus, SCA has been
posted for these post frontal winds.

Sunday...

NNE winds 15-20 kt in the morning, becoming NW and diminishing
in the afternoon. Great vsby to the horizon along with dry
weather.

Sunday night...

1020 mb high pressure over the Great Lakes yields light winds
across the waters, along with good vsby and dry weather.

Outlook /Monday through Thursday/...

Saturday: Winds less than 25 kt. Areas of seas approaching
5 ft. Slight chance of rain showers, isolated thunderstorms.

Saturday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Areas of seas approaching 5 ft. Scattered
rain showers, isolated thunderstorms, patchy fog.

Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.

Sunday Night: Winds less than 25 kt.

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

Wednesday: Winds less than 25 kt.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Flood Watch until 11 PM EDT this evening for CTZ002>004.
     Heat Advisory until 8 PM EDT this evening for CTZ002>004.
MA...Flood Watch until 11 PM EDT this evening for MAZ002>018-020-
     021-026.
     Heat Advisory until 8 PM EDT this evening for MAZ005-010>021.
RI...Flood Watch until 11 PM EDT this evening for RIZ001>005-007.
     Heat Advisory until 8 PM EDT this evening for RIZ001>007.
MARINE...Small Craft Advisory from 8 PM this evening to 8 AM EDT Sunday
     for ANZ230>235-237-250-251-254.
     Small Craft Advisory until 8 AM EDT Sunday for ANZ255-256.

&&

SYNOPSIS...Nocera/Nash
NEAR TERM...Nocera
SHORT TERM...Nocera
LONG TERM...BL/Nash
AVIATION...Nocera/BL/Nash
MARINE...Nocera/BL/Nash

Hazardous Weather Outlook
National Weather Service Boston/Norton MA
408 PM EDT Sat Jul 29 2023

MAZ002>004-006>009-026-302015-
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Western Essex MA-Eastern Essex MA-Western Hampshire MA-
Western Hampden MA-Northern Middlesex MA-
409 PM EDT Sat Jul 29 2023

...FLOOD WATCH IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH THIS
EVENING...
...SEVERE THUNDERSTORM WATCH 568 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for central Massachusetts,
eastern Massachusetts, northeastern Massachusetts and western
Massachusetts.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flood Watch.
   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

CTZ002>004-MAZ005-010>018-020-021-RIZ001>005-007-302015-
Hartford CT-Tolland CT-Windham CT-Central Middlesex MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Western Norfolk MA-Southeast Middlesex MA-Suffolk MA-
Eastern Norfolk MA-Northern Bristol MA-Western Plymouth MA-
Southern Bristol MA-Southern Plymouth MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-
Newport RI-
409 PM EDT Sat Jul 29 2023

...FLOOD WATCH IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH THIS
EVENING...
...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...SEVERE THUNDERSTORM WATCH 568 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for northern Connecticut, central
Massachusetts, eastern Massachusetts, southeastern Massachusetts,
western Massachusetts, northern Rhode Island and southern Rhode
Island.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flood Watch.
   Heat Advisory.
   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ019-RIZ006-302015-
Eastern Plymouth MA-Washington RI-
409 PM EDT Sat Jul 29 2023

...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...SEVERE THUNDERSTORM WATCH 568 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for southeastern Massachusetts
and southern Rhode Island.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Heat Advisory.
   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ022>024-RIZ008-302015-
Barnstable MA-Dukes MA-Nantucket MA-Block Island RI-
409 PM EDT Sat Jul 29 2023

...SEVERE THUNDERSTORM WATCH 568 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for southeastern Massachusetts
and southern Rhode Island.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ250-254>256-302015-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
Coastal Waters extending out to 25 nm South of Marthas Vineyard and
Nantucket-
Coastal Waters from Montauk NY to Marthas Vineyard extending out to
20 nm South of Block Island-
409 PM EDT Sat Jul 29 2023

This Hazardous Weather Outlook is for Massachusetts coastal waters
and Rhode Island coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230>237-251-302015-
Boston Harbor-Cape Cod Bay-Nantucket Sound-Vineyard Sound-
Buzzards Bay-Rhode Island Sound-Narragansett Bay-Block Island Sound-
Massachusetts Bay and Ipswich Bay-
409 PM EDT Sat Jul 29 2023

...SEVERE THUNDERSTORM WATCH 568 IN EFFECT UNTIL 9 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for Massachusetts coastal waters
and Rhode Island coastal waters.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

For more information on upcoming hazardous weather, please see the
Area Forecast Discussion on our webpage for the latest forecast
thinking. There is also our Enhanced Hazardous Weather Outlook at
www.weather.gov/box/ehwo

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston

Special Weather Statement
National Weather Service Boston/Norton MA
238 PM EDT Sat Jul 29 2023

CTZ002>004-291945-
Hartford CT-Tolland CT-Windham CT-
238 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of southern Windham,
southern Tolland and southeastern Hartford Counties through 345 PM
EDT...

At 238 PM EDT, Doppler radar was tracking a strong thunderstorm over
Bolton, or near Manchester, moving east at 25 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Strong winds could cause minor damage such as downed
         branches. Minor damage to outdoor objects is possible.

Locations impacted include...
Manchester, Glastonbury, Vernon, Mansfield, South Windsor, Windham,
Plainfield, Willimantic, Killingly, Tolland, Coventry, Hebron,
Putnam, Brooklyn, Marlborough, Willington, Columbia, Canterbury,
Bolton and Ashford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when you hear thunder. Do not resume outdoor activities
until at least 30 minutes after the storm has passed.

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. For your
safety, go indoors or to your vehicle.

This storm may intensify and become severe. Stay tuned to your local
media for updates and possible warnings.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern Connecticut.

&&

LAT...LON 4188 7185 4165 7185 4163 7196 4166 7213
      4166 7216 4171 7224 4169 7227 4167 7227
      4164 7233 4165 7256 4183 7257
TIME...MOT...LOC 1838Z 269DEG 22KT 4175 7247

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

KP

Preliminary Local Storm Report...Summary
National Weather Service Boston/Norton MA
249 PM EDT Sat Jul 29 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0524 AM     Tstm Wnd Gst     2 N Block Island        41.19N 71.59W
07/29/2023  M62 MPH          Washington         RI   Mesonet

            WeatherFlow station XBLK Block Island Jetty.

0535 AM     Tstm Wnd Gst     5 SSW Narragansett      41.36N 71.50W
07/29/2023  M45 MPH          ANZ237             RI   Mesonet

            WeatherFlow station XJUD Point Judith.

0140 PM     Flood            1 SW Newton             42.32N 71.22W
07/29/2023                   Middlesex          MA   Law Enforcement

            Relayed by amateur radio. Route 9 eastbound
            at Lucille Place flooded with manhole covers
            popped in the area.

0150 PM     Flood            1 SSE Brighton          42.34N 71.14W
07/29/2023                   Suffolk            MA   Law Enforcement

            Relayed by amateur radio. Beacon street at
            Warwick road flooded to the point where DPW
            assistance was requested. Several flooded
            basements in buildings along Beacon street.

0202 PM     Flood            2 SE Boston             42.30N 71.05W
07/29/2023                   Suffolk            MA   Law Enforcement

            Relayed by amateur radio. I93 northbound in
            the area of exit 13A flooded to the point
            where Mass DOT assistance was requested.

0206 PM     Flood            1 NE Wellesley          42.31N 71.27W
07/29/2023                   Norfolk            MA   Law Enforcement

            Relayed by amateur radio. Area near the 300
            block of Washington street completely
            flooded over the sidewalk and into a
            business parking lot. DPW assistance was
            requested.

0223 PM     Flood            2 NW Quincy             42.28N 71.03W
07/29/2023                   Norfolk            MA   Law Enforcement

            Relayed by amateur radio. DPW assistance
            requested for flooding on Enterprise drive
            at Newport Extension Avenue.

0228 PM     Flood            2 NW Quincy             42.29N 71.03W
07/29/2023                   Norfolk            MA   Law Enforcement

            Relayed by amateur radio. Quincy shore drive
            at Bay state road closed due to flooding.

0229 PM     Flood            1 WNW Quincy            42.27N 71.02W
07/29/2023                   Norfolk            MA   Amateur Radio

            2 feet deep flooding on Brook street at low
            points intersecting Fayette street, Safford
            Street, and Taylor street. One car with
            water to bottom of the doors.

&&

Special Weather Statement
National Weather Service Boston/Norton MA
318 PM EDT Sat Jul 29 2023

MAZ005>007-292000-
Eastern Essex MA-Central Middlesex County MA-Western Essex MA-
318 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of northwestern Essex
and northeastern Middlesex Counties through 400 PM EDT...

At 317 PM EDT, Doppler radar was tracking a strong thunderstorm over
Chelmsford, moving northeast at 25 mph.

HAZARD...Minor flooding.

SOURCE...Radar indicated.

IMPACT...Minor nuisance flooding of typically flood prone areas.

Locations impacted include...
Lowell, Lawrence, Haverhill, Methuen, Billerica, Chelmsford, Andover,
Dracut, Tewksbury, North Andover, Westford, Tyngsborough, Georgetown,
Boxford, Groveland, Rowley, Carlisle and West Newbury.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when you hear thunder. Do not resume outdoor activities
until at least 30 minutes after the storm has passed. Avoid flooded
road ways.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northeastern Massachusetts.

&&

LAT...LON 4271 7093 4254 7134 4263 7148 4270 7134
      4270 7129 4274 7124 4275 7122 4274 7119
      4278 7118 4282 7111 4281 7107 4283 7105
TIME...MOT...LOC 1917Z 235DEG 24KT 4260 7134

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH

RM

Special Weather Statement
National Weather Service Boston/Norton MA
356 PM EDT Sat Jul 29 2023

CTZ004-RIZ001>004-292100-
Windham CT-Northwest Providence RI-Eastern Kent RI-Western Kent RI-
Southeast Providence RI-
356 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of southeastern
Windham, Kent and southwestern Providence Counties through 500 PM
EDT...

At 356 PM EDT, Doppler radar was tracking a strong thunderstorm over
Canterbury, or near Windham, moving east at 20 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Strong winds could cause minor damage such as downed
         branches. Little to no impact from hail is expected.

Locations impacted include...
Warwick, Cranston, Coventry, West Warwick, Johnston, Windham,
Plainfield, Smithfield, Killingly, East Greenwich, Scituate,
Glocester, Brooklyn, West Greenwich, Canterbury, Foster, Sterling,
Chaplin, Hampton and Scotland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when you hear thunder. Do not resume outdoor activities
until at least 30 minutes after the storm has passed.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. For your
safety, go indoors or to your vehicle.

This storm may intensify and become severe. Stay tuned to your local
media for updates and possible warnings.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern Connecticut...and Rhode Island.

&&

LAT...LON 4162 7179 4164 7179 4165 7186 4163 7196
      4166 7211 4179 7213 4188 7151 4162 7148
      4161 7149
TIME...MOT...LOC 1956Z 264DEG 18KT 4172 7203

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

KP

Special Weather Statement
National Weather Service Boston/Norton MA
405 PM EDT Sat Jul 29 2023

MAZ003-008>011-292100-
Western Hampshire MA-Western Hampden MA-Eastern Hampden MA-
Eastern Franklin MA-Eastern Hampshire MA-
405 PM EDT Sat Jul 29 2023

...A strong thunderstorm will impact portions of southeastern
Hampshire, south central Franklin and northwestern Hampden Counties
through 500 PM EDT...

At 405 PM EDT, Doppler radar was tracking a strong thunderstorm over
Russell, or near Westfield, moving northeast at 20 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Strong winds could cause minor damage such as downed
         branches. Little to no impact from hail is expected.

Locations impacted include...
Chicopee, Westfield, Holyoke, Amherst, Northampton, West Springfield,
Ludlow, South Hadley, Easthampton, Belchertown, Ware, Southwick,
Granby, Southampton, Hadley, Sunderland, Hatfield, Williamsburg,
Huntington and Leverett.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when you hear thunder. Do not resume outdoor activities
until at least 30 minutes after the storm has passed.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
western Massachusetts.

&&

LAT...LON 4207 7289 4214 7296 4249 7255 4228 7232
TIME...MOT...LOC 2005Z 231DEG 18KT 4214 7287

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

KP

Preliminary Local Storm Report...Summary
National Weather Service Boston/Norton MA
408 PM EDT Sat Jul 29 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0524 AM     Tstm Wnd Gst     2 N Block Island        41.19N 71.59W
07/29/2023  M62 MPH          Washington         RI   Mesonet

            WeatherFlow station XBLK Block Island Jetty.

0535 AM     Tstm Wnd Gst     5 SSW Narragansett      41.36N 71.50W
07/29/2023  M45 MPH          ANZ237             RI   Mesonet

            WeatherFlow station XJUD Point Judith.

0140 PM     Flood            1 SW Newton             42.32N 71.22W
07/29/2023                   Middlesex          MA   Law Enforcement

            Relayed by amateur radio. Route 9 eastbound
            at Lucille Place flooded with manhole covers
            popped in the area.

0150 PM     Flood            1 SSE Brighton          42.34N 71.14W
07/29/2023                   Suffolk            MA   Law Enforcement

            Relayed by amateur radio. Beacon street at
            Warwick road flooded to the point where DPW
            assistance was requested. Several flooded
            basements in buildings along Beacon street.

0202 PM     Flood            2 SE Boston             42.30N 71.05W
07/29/2023                   Suffolk            MA   Law Enforcement

            Relayed by amateur radio. I93 northbound in
            the area of exit 13A flooded to the point
            where Mass DOT assistance was requested.

0206 PM     Flood            1 NE Wellesley          42.31N 71.27W
07/29/2023                   Norfolk            MA   Law Enforcement

            Relayed by amateur radio. Area near the 300
            block of Washington street completely
            flooded over the sidewalk and into a
            business parking lot. DPW assistance was
            requested.

0223 PM     Flood            2 NW Quincy             42.28N 71.03W
07/29/2023                   Norfolk            MA   Law Enforcement

            Relayed by amateur radio. DPW assistance
            requested for flooding on Enterprise drive
            at Newport Extension Avenue.

0228 PM     Flood            2 NW Quincy             42.29N 71.03W
07/29/2023                   Norfolk            MA   Law Enforcement

            Relayed by amateur radio. Quincy shore drive
            at Bay state road closed due to flooding.

0229 PM     Flood            1 WNW Quincy            42.27N 71.02W
07/29/2023                   Norfolk            MA   Amateur Radio

            2 feet deep flooding on Brook street at low
            points intersecting Fayette street, Safford
            Street, and Taylor street. One car with
            water to bottom of the doors.

0230 PM     Tstm Wnd Gst     Weymouth                42.21N 70.95W
07/29/2023  M52 MPH          Norfolk            MA   Mesonet

0235 PM     Tstm Wnd Dmg     2 WNW Scituate          42.20N 70.77W
07/29/2023                   Plymouth           MA   Law Enforcement

            In Scituate, large branches were down on
            Route 3A in front of the DPW. Report relayed
            by amateur radio.

0235 PM     Tstm Wnd Dmg     Cohasset                42.23N 70.80W
07/29/2023                   Plymouth           MA   Law Enforcement

            In Cohasset, a large tree limb and wires
            were down on Beechwood Street. Report
            relayed by amateur radio.

0240 PM     Tstm Wnd Gst     Hingham                 42.24N 70.89W
07/29/2023  M45 MPH          Plymouth           MA   Mesonet

&&