Alert archive / Massachusetts / Special Weather Statements in 2019

Special Weather Statement, NWS Boston/Norton, MA

July 17, 2019Bristol County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Jul 17, 2019, 7:21 PM EDT for Bristol County, Massachusetts. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 17, 2019, 7:21 PM EDT (23:21 UTC)
Expired
Jul 17, 2019, 8:00 PM EDT
In force
39 min
Issued by
NWS Boston/Norton, MA

County Bristol County, MA

The radar

The Boston radar (KBOX), 44 km from the middle of the area, began a volume at 23:25 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 11.4 hours before the alert went out and 63 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Chatham, MA at 12:00Z on 2019-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 297 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 12:00Z on 2019-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
297 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
1172 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

238 
WWUS81 KBOX 172321
SPSBOX

Special Weather Statement
National Weather Service Boston/Norton MA
721 PM EDT Wed Jul 17 2019
 
MAZ018>022-180000-
Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA-
Western Plymouth MA-Barnstable MA-
721 PM EDT Wed Jul 17 2019

...STRONG THUNDERSTORM IN SOUTHEAST MASSACHUSETTS...

At 720 PM EDT, Doppler radar was tracking a strong thunderstorm near
Freetown and Fall River, moving east at 30 mph.

Winds of 40 mph, torrential rainfall, and frequent lightning will 
accompany this storm.

This strong thunderstorm will be near...
  New Bedford and Acushnet around 730 PM EDT.
  Mattapoisett around 740 PM EDT.
  Rochester around 745 PM EDT.
  Marion around 750 PM EDT.
  Wareham around 755 PM EDT.
  Bourne around 800 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

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

Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.

&&

LAT...LON 4166 7055 4167 7069 4169 7069 4171 7068
      4172 7070 4167 7070 4171 7107 4179 7108
      4181 7054
TIME...MOT...LOC 2320Z 271DEG 28KT 4173 7102 

$$

JWD

What forecasters said that day

The local office's own words before this special weather statement went out, 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 this special weather statement went out at Jul 17, 7:08 PM EDT, 13 minutes earlier.

Area forecast discussion, Jul 17, 7:08 PM EDT, 13 minutes before
Area Forecast Discussion
National Weather Service Boston/Norton MA
708 PM EDT Wed Jul 17 2019

.SYNOPSIS...

The threat for thunderstorms and localized flash flooding this
evening was now confined to mainly Rhode Island and southeast
Massachusetts. This activity will push south through the
evening and we may see a lull in the activity. Additional
showers are expected overnight into Thursday, which may also
result in localized flooding. Hot and humid Friday through
Sunday with heat- related headlines likely but will be watching
for possible surprise thunderstorm activity. A sweeping cold
front Monday with a scattered line of showers and thunderstorm
Monday behind which relief in the form of seasonable
temperatures, lower humidity is on tap into late- July.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...

7 pm update...

We continue to trim the Flash Flood/Severe Thunderstorm watches
further south with the cold front. The threat for any isolated
severe/localized flooding will be from near Providence to
Plymouth, points south and east. However, this risk will be
isolated given that the outflow has surged southeast of the main
area of convection.

Otherwise...just some scattered showers the rest of the night.
Areas of dense fog will be a concern for the islands and perhaps
further northwest onto the south coast. Low temps will mainly
range from around 70 to the lower 70s.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH 6 PM THURSDAY/...

* Additional showers with localized heavy rainfall will be a
  concern on Thursday mainly south of the MA Turnpike.

After a lull in the activity later tonight, showers should
increase in coverage toward daybreak Thursday. Showers will
continue at times Thursday with the focus south of the MA
turnpike. A few embedded thunderstorms are also possible. We
can not rule out localized flooding mainly south of the MA
turnpike, in the vicinity of a stalled boundary and higher
Pwats. Confidence is rather low though on what exactly will
transpire, but if any flooding occurs it probably will be rather
localized. High temperatures on Thursday will be held mainly in
the 70s with clouds and a northeast flow.

&&

.LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/...

*/ Highlights ...

 - Hot and humid Friday thru Sunday, likely heat-related headlines
 - Sweeping cold front with possible showers, thunderstorms Monday
 - Relief with lower humidity, comfortable conditions after Monday

*/ Overview ...

Mid-July heat, late-July relief. S U.S. heat bubble brought about by
Gulf of AK low (+EPO) and SW CONUS monsoon high. Contributions from
the two, subsequent heat pump and higher heights per H85 temperature
anomalies around +5C, for example. Near-flat flow across the N CONUS
and S Canada, will be watching closely heat / humidity / instability
preceding any ejecting N Pacific mid-level impulses, whether there's
any shower and/or thunderstorm activity, plus Barry's remnants. But
into late-July a possible H5 pattern retrograde. Shift to a -EPO as
the 4-corners monsoonal H5 high builds. Deeper E CONUS H5 troughing
with prevailing NW flow aloft points towards relief of cooler, drier
Canadian air being ushered S. CPC 8-14 day outlook hints at possible
below-average surface temperatures for the Great Lakes into the NE
CONUS. Break down the details below.

*/ Details ...

Friday through Sunday ...

Hot and humid. H85 temperatures around +20-22C, H7 around +10-12C.
But concern. Steep mid-level lapse rates around Saturday, a lot of
low-level instability. Shear vectors and orientation that suggest
that if something were to become organized over Michigan within the
region of steep mid level lapse rates and advect that perhaps we
could see MCS / derecho activity Saturday and Sunday. Initial
thinking, but nothing set in stone. Initial indications per 17.12z
NAM and 17.0z EC, but not much indication in SREF / GFS. It would
subsequently impact 2m temperature with cloud cover altering the
heat and humidity forecast. Typically when we get the heat and
humidity where highs alone approach triple digits do we see via
climatology MCS / derecho events. Continued forecast of mid to
upper 90 highs, some locations at or just slightly above 100
with dewpoints in the low 70s as boundary layer moisture is
trapped beneath the cap, fueled by S flow, yielding heat indices
around the triple digits, for some locations at or above 110F.

Beginning Monday ...

Relief. Pattern change discussed in OVERVIEW, a series of sweeping
cold fronts will prevail beneath preferred H5 troughing across NE N
America. Usherance of cooler, drier air S out of Canada along the
leading edge of which a line of scattered shower and thunderstorm
activity is to be expected, Monday into Monday night especially.
Indications of a decent plume of continental-tropical moisture that
precedes the cold front. Timing crucial as early indications suggest
modest uni-directional deep-layer SW shear, accompanying instability
plume nudging into S New England. Low confidence forecast, something
to closely monitor. Seasonable temperatures around the low to mid
80s with much lower humidity, comfortable conditions after the cold
front sweeps through.

&&

.AVIATION /00Z THURSDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

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

Short Term /through Thursday/...Moderate confidence.

Tonight...The bulk of the showers and thunderstorms were mainly
along and southeast of a Providence to Plymouth line and will
push south of the region over the next few hours. Otherwise,
much of the overnight hours will feature just a few showers .

Outside the activity, VFR conditions should prevail much of
tonight. However low clouds and fog across the Cape/Islands will
begin to expand northwest toward daybreak.

Thursday...MVFR to IFR conditions expected in rounds
of showers and perhaps a few embedded thunderstorms. The
heaviest rainfall may setup near and south of the MA
Turnpike...which may result in brief LIFR conditions. LIFR
conditions also possible in fog across the southeast New England
coast.

KBOS Terminal...Moderate confidence in TAF.

KBDL Terminal...Moderate confidence in TAF.

Outlook /Thursday Night through Monday/...High confidence.

Thursday Night: Mainly VFR, with areas IFR possible. Chance
SHRA, slight chance TSRA.

Friday: Mainly VFR, with local IFR possible.

Friday Night: VFR.

Saturday through Sunday Night: VFR. Slight chance SHRA,
isolated TSRA.

Monday: Mainly VFR, with local MVFR possible. Chance SHRA,
slight chance TSRA.

&&

.MARINE...
Forecaster Confidence Levels...

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

Short Term /through Thursday/...High confidence.

Tonight and Thursday...Main concern this evening in
thunderstorms with locally strong wind gusts. Showers and
isolated t-storms will continue at times overnight into Thursday
along with areas of fog. Also, will have to watch for a period
of northeast wind gusts of 20 to 25 knots across the northern
waters behind the remnants of Barry. We may need to hoist a
small craft advisory.

Outlook /Thursday Night through Monday/...High confidence.

Thursday Night: Winds less than 25 kt. Chance of rain showers,
slight chance of thunderstorms.

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

Friday Night: Winds less than 25 kt. Areas of seas approaching
5 ft.

Saturday: Winds less than 25 kt. Seas locally approaching 5 ft.
Slight chance of rain showers.

Saturday Night through Sunday: Winds less than 25 kt. Seas
locally approaching 5 ft. Slight chance of rain showers,
isolated thunderstorms.

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

Monday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Chance of rain showers, slight chance of thunderstorms.

&&

.CLIMATE...
Record highs for Wednesday July 17 are as follows:

BOS: 98F in 1977 & 1999
BDL: 97F in 1999
PVD: 97F in 1977 & 1999
ORH: 93F in 1900

Record highest min temps for Saturday July 20:

BOS: 75 in 2016
BDL: 73 in 1975
PVD: 77 in 1983
ORH: 72 in 2013

Record highs for Saturday July 20:

BOS: 99 in 1991
BDL: 100 in 1991
PVD: 101 in 1991
ORH: 92 in 1901

Record highest min temps for Sunday July 21:

BOS: 81 in 1991
BDL: 74 in 1977
PVD: 77 in 1980
ORH: 73 in 1991

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Flash Flood Watch until 11 PM EDT this evening for CTZ002>004.
MA...Flash Flood Watch until 11 PM EDT this evening for MAZ012-013-
     016>022.
RI...Flash Flood Watch until 11 PM EDT this evening for RIZ001>007.
MARINE...None.

&&

SYNOPSIS...Frank/Sipprell
NEAR TERM...Frank
SHORT TERM...Frank
LONG TERM...Sipprell
AVIATION...Frank/Sipprell
MARINE...Frank/Sipprell
CLIMATE...Staff
Hazardous weather outlook, Jul 17, 6:14 PM EDT, 1 hour 7 minutes before
Hazardous Weather Outlook
National Weather Service Boston/Norton MA
614 PM EDT Wed Jul 17 2019

MAZ002>011-014-015-023-024-026-182215-
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Eastern Essex MA-
Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-
Eastern Hampden MA-Southeast Middlesex MA-Suffolk MA-Dukes MA-
Nantucket MA-Northern Middlesex MA-
614 PM EDT Wed Jul 17 2019

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

.DAY ONE...Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday ... Remnants of Hurricane Barry will move across Southern
New England bringing showers and scattered thunderstorms. Heavy
downpours can be expected with 1 to 2 inch per hour rainfall rates
which could lead to localized flooding of urban and poor drainage
areas.

Friday through Monday ...
Increasing heat and humidity with the hottest conditions on
Saturday. Much of the interior could have a heat index around 95F to
100F Friday and Sunday, and a heat index of 100F up to 110F on
Saturday.

A heat advisory would be issued for expected one-day heat indices of
100F to 104F, or two-day heat indices of 95F to 99F. Excessive heat
warnings for expected one-day heat indices of 105F or higher.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

CTZ002>004-MAZ017>022-RIZ001>007-182215-
Hartford CT-Tolland CT-Windham CT-Northern Bristol MA-
Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-
Southern Plymouth MA-Barnstable MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-
Washington RI-Newport RI-
614 PM EDT Wed Jul 17 2019

...FLASH FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...SEVERE THUNDERSTORM WATCH 516 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for northern Connecticut,
southeastern 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.

   Flash Flood Watch.
   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday ... Remnants of Hurricane Barry will move across Southern
New England bringing showers and scattered thunderstorms. Heavy
downpours can be expected with 1 to 2 inch per hour rainfall rates
which could lead to localized flooding of urban and poor drainage
areas.

Friday through Monday ...
Increasing heat and humidity with the hottest conditions on
Saturday. Much of the interior could have a heat index around 95F to
100F Friday and Sunday, and a heat index of 100F up to 110F on
Saturday.

A heat advisory would be issued for expected one-day heat indices of
100F to 104F, or two-day heat indices of 95F to 99F. Excessive heat
warnings for expected one-day heat indices of 105F or higher.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

RIZ008-182215-
Block Island RI-
614 PM EDT Wed Jul 17 2019

...SEVERE THUNDERSTORM WATCH 516 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for 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...Thursday through Tuesday.

Thursday ... Remnants of Hurricane Barry will move across Southern
New England bringing showers and scattered thunderstorms. Heavy
downpours can be expected with 1 to 2 inch per hour rainfall rates
which could lead to localized flooding of urban and poor drainage
areas.

Friday through Monday ...
Increasing heat and humidity with the hottest conditions on
Saturday. Much of the interior could have a heat index around 95F to
100F Friday and Sunday, and a heat index of 100F up to 110F on
Saturday.

A heat advisory would be issued for expected one-day heat indices of
100F to 104F, or two-day heat indices of 95F to 99F. Excessive heat
warnings for expected one-day heat indices of 105F or higher.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

MAZ012-013-016-182215-
Southern Worcester MA-Western Norfolk MA-Eastern Norfolk MA-
614 PM EDT Wed Jul 17 2019

...FLASH FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for central Massachusetts and
eastern 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.

   Flash Flood Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday ... Remnants of Hurricane Barry will move across Southern
New England bringing showers and scattered thunderstorms. Heavy
downpours can be expected with 1 to 2 inch per hour rainfall rates
which could lead to localized flooding of urban and poor drainage
areas.

Friday through Monday ...
Increasing heat and humidity with the hottest conditions on
Saturday. Much of the interior could have a heat index around 95F to
100F Friday and Sunday, and a heat index of 100F up to 110F on
Saturday.

A heat advisory would be issued for expected one-day heat indices of
100F to 104F, or two-day heat indices of 95F to 99F. Excessive heat
warnings for expected one-day heat indices of 105F or higher.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

ANZ234>237-256-182215-
Buzzards Bay-Rhode Island Sound-Narragansett Bay-Block Island Sound-
Coastal Waters from Montauk NY to Marthas Vineyard extending out to
20 nm South of Block Island-
614 PM EDT Wed Jul 17 2019

...SEVERE THUNDERSTORM WATCH 516 IN EFFECT UNTIL 10 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...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

ANZ230>233-250-251-254-255-182215-
Boston Harbor-Cape Cod Bay-Nantucket Sound-Vineyard Sound-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-Massachusetts Bay and Ipswich Bay-
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-
614 PM EDT Wed Jul 17 2019

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Tonight.

A few thunderstorms with locally strong wind gusts are possible into
this evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

Frank

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

You can follow us on Facebook at
www.facebook.com/us.nationalweatherservice.boston.gov

You can follow us on Twitter at
@NWSBoston

In the hours before

Local storm report, Jul 17, 4:29 PM EDT, 2 hours 52 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
429 PM EDT WED JUL 17 2019

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

0230 PM     TSTM WND DMG     BARRE                   42.42N  72.11W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            POWER LINES DOWN ON SPRING HILL ROAD, TREE DOWN ON
            BARRE ROAD CUTOFF.

0233 PM     TSTM WND DMG     HUBBARDSTON             42.48N  72.02W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            MULTIPLE TREES DOWN ACROSS TOWN

0337 PM     TSTM WND DMG     WESTBOROUGH             42.27N  71.62W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            LARGE TREES DOWN ON UPTON ROAD. ALSO AT BOWMAN STREET
            AT COACH ROAD BLOCKING ROAD

0355 PM     TSTM WND DMG     HOLLISTON               42.20N  71.43W
07/17/2019                   MIDDLESEX          MA   AMATEUR RADIO

            TREE DOWN ON POWER LINES ON ASHLAND STREET

0410 PM     TSTM WND DMG     BELCHERTOWN             42.27N  72.40W
07/17/2019                   HAMPSHIRE          MA   AMATEUR RADIO

            TREE DOWN ON HOUSE ON BOARDMAN STREET

&&

EVENT NUMBER BOX1902592
EVENT NUMBER BOX1902593
EVENT NUMBER BOX1902594
EVENT NUMBER BOX1902595
EVENT NUMBER BOX1902596

WS
Special weather statement, Jul 17, 4:34 PM EDT, 2 hours 47 minutes before
Special Weather Statement
National Weather Service Boston/Norton MA
434 PM EDT Wed Jul 17 2019

MAZ012-013-017-018-RIZ001-172115-
Southern Worcester MA-Northern Bristol MA-Western Norfolk MA-
Western Plymouth MA-Northwest Providence RI-
434 PM EDT Wed Jul 17 2019

...TORRENTIAL RAINFALL WITH THUNDERSTORMS IN NORTHWEST RHODE
ISLAND...

At 433 PM EDT, Doppler radar was tracking a strong thunderstorm over
Burrillville, or 8 miles west of Woonsocket, moving east at 45 mph.

Torrential rainfall and winds in excess of 30 mph will accompany
this storm.

This strong thunderstorm will be near...
  North Smithfield around 440 PM EDT.
  Woonsocket, Lincoln and Blackstone around 445 PM EDT.
  Cumberland, Bellingham, Wrentham and Plainville around 450 PM EDT.
  Franklin and North Attleborough around 455 PM EDT.
  Attleboro and Norfolk around 500 PM EDT.
  Mansfield and Foxborough around 505 PM EDT.
  Norton and Sharon around 510 PM EDT.
  Stoughton, Easton, Canton and West Bridgewater around 515 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

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

Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.

&&

LAT...LON 4186 7170 4198 7176 4217 7114 4201 7105
TIME...MOT...LOC 2033Z 251DEG 40KT 4197 7165

JWD
Special weather statement, Jul 17, 5:50 PM EDT, 1 hour 31 minutes before
Special Weather Statement
National Weather Service Boston/Norton MA
550 PM EDT Wed Jul 17 2019

MAZ013-016>019-RIZ001-172230-
Eastern Plymouth MA-Northern Bristol MA-Western Norfolk MA-
Eastern Norfolk MA-Western Plymouth MA-Northwest Providence RI-
550 PM EDT Wed Jul 17 2019

...LINE OF STRONG THUNDERSTORMS...

At 549 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Norfolk to Plainville. Movement was east
at 45 mph.

Torrential rainfall, frequent lightning, and wind gusts of 30 to 40
mph will accompany these storms.

Strong thunderstorms will be near...
  Sharon around 555 PM EDT.
  Randolph, Stoughton, Easton, Canton, Norton and Avon around 605 PM
  EDT.
  Brockton, Braintree, Bridgewater, Holbrook and West Bridgewater
  around 610 PM EDT.
  Weymouth, Rockland, Abington, Whitman and East Bridgewater around
  615 PM EDT.
  Hingham, Hanover, Hanson, Cohasset and Halifax around 620 PM EDT.
  Pembroke, Kingston and Norwell around 625 PM EDT.
  Marshfield, Scituate and Duxbury around 630 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when these storms approach. Winds may be strong enough to
produce minor damage, such as a few downed branches.

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

Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.

&&

LAT...LON 4198 7062 4198 7139 4206 7139 4221 7094
      4226 7074 4221 7070 4218 7071 4201 7058
TIME...MOT...LOC 2149Z 260DEG 40KT 4211 7129 4201 7131

JWD
Local storm report, Jul 17, 6:34 PM EDT, 47 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
634 PM EDT WED JUL 17 2019

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

0230 PM     TSTM WND DMG     BARRE                   42.42N  72.11W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            POWER LINES DOWN ON SPRING HILL ROAD, TREE DOWN ON
            BARRE ROAD CUTOFF.

0233 PM     TSTM WND DMG     HUBBARDSTON             42.48N  72.02W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            MULTIPLE TREES DOWN ACROSS TOWN

0337 PM     TSTM WND DMG     WESTBOROUGH             42.27N  71.62W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            LARGE TREES DOWN ON UPTON ROAD. ALSO AT BOWMAN STREET
            AT COACH ROAD BLOCKING ROAD

0355 PM     TSTM WND DMG     HOLLISTON               42.20N  71.43W
07/17/2019                   MIDDLESEX          MA   AMATEUR RADIO

            TREE DOWN ON POWER LINES ON ASHLAND STREET

0410 PM     TSTM WND DMG     BELCHERTOWN             42.27N  72.40W
07/17/2019                   HAMPSHIRE          MA   AMATEUR RADIO

            TREE DOWN ON HOUSE ON BOARDMAN STREET

0410 PM     TSTM WND DMG     BELCHERTOWN             42.27N  72.40W
07/17/2019                   HAMPSHIRE          MA   AMATEUR RADIO

            MULTIPLE TREES DOWN ON EAST STREET AND ORCHARD STREET

0420 PM     FLOOD            QUINCY                  42.26N  71.01W
07/17/2019                   NORFOLK            MA   AMATEUR RADIO

            QUINCY SHORE DRIVE AT BAY STATE ROAD FLOODED AND
            IMPASSABLE

0441 PM     TSTM WND DMG     BURRILLVILLE            41.95N  71.72W
07/17/2019                   PROVIDENCE         RI   AMATEUR RADIO

            TREE AND WIRES DOWN BLOCKING SHERMAN FARM ROAD, TREES
            AND WIRES DOWN ON ROOSEVELT AVE

0453 PM     TSTM WND DMG     BLACKSTONE              42.02N  71.54W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            TREES DOWN ON LINCOLN STREET AT TEEJAY LANE. TREE DOWN
            AT GOODARD AT WASHINGTON STREET

0453 PM     TSTM WND DMG     MILLVILLE               42.03N  71.58W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            MULTIPLE TREES DOWN ACROSS TOWN

0456 PM     TSTM WND DMG     SCITUATE                42.19N  70.73W
07/17/2019                   PLYMOUTH           MA   AMATEUR RADIO

            MULTIPLE TREES DOWN ACROSS TOWN

0458 PM     TSTM WND DMG     NORWELL                 42.17N  70.78W
07/17/2019                   PLYMOUTH           MA   AMATEUR RADIO

            TREES DOWN ON WIRES AT SUMMER, PLEASENT STREETS AND ON
            KING PHILIP DRIVE

0502 PM     TSTM WND DMG     BELLINGHAM              42.09N  71.47W
07/17/2019                   NORFOLK            MA   AMATEUR RADIO

            LARGE TREE DOWN ON POWER LINES AT PULASKI DRIVE

0502 PM     TSTM WND DMG     FRANKLIN                42.09N  71.39W
07/17/2019                   NORFOLK            MA   AMATEUR RADIO

            MULTIPLE TREES DOWN ON CHESTNUT STREET AND ON ONLTN AVE

0503 PM     TSTM WND DMG     NORTHBOROUGH            42.31N  71.65W
07/17/2019                   WORCESTER          MA   AMATEUR RADIO

            TREE DOWN BLOCKING ROAD ON SCHOOL STREET

0508 PM     TSTM WND DMG     NORFOLK                 42.12N  71.32W
07/17/2019                   NORFOLK            MA   AMATEUR RADIO

            LARGE TREE DOWN ON POWER LINES

0518 PM     TSTM WND DMG     SHARON                  42.12N  71.18W
07/17/2019                   NORFOLK            MA   AMATEUR RADIO

            TREE DOWN ON EAST FOXBORO STREET BY HARDING STREET

0519 PM     TSTM WND DMG     MEDFIELD                42.19N  71.30W
07/17/2019                   NORFOLK            MA   AMATEUR RADIO

            TREE DOWN ON GRANITE STREET

&&

EVENT NUMBER BOX1902592 BOX1902593 BOX1902594 BOX1902595 BOX1902596
BOX1902597 BOX1902598 BOX1902599 BOX1902600 BOX1902601 BOX1902602
BOX1902603 BOX1902604 BOX1902605 BOX1902606 BOX1902607 BOX1902608
BOX1902609

ws
Special weather statement, Jul 17, 6:37 PM EDT, 44 minutes before
Special Weather Statement
National Weather Service Boston/Norton MA
637 PM EDT Wed Jul 17 2019

MAZ017>019-172315-
Eastern Plymouth MA-Northern Bristol MA-Western Plymouth MA-
637 PM EDT Wed Jul 17 2019

...LINE OF STRONG THUNDERSTORMS...

At 636 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Kingston to near Middleborough. Movement was
east at 30 mph.

Winds up to 40 mph, frequent lightning, and torrential rainfall will
accompany these storms.

Strong thunderstorms will be near...
  Plymouth and Kingston around 640 PM EDT.
  Duxbury around 645 PM EDT.
  Marshfield and Carver around 650 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when these storms approach. Winds may be strong enough to
produce minor damage, such as a few downed branches.

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

Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.

&&

LAT...LON 4188 7101 4207 7088 4207 7063 4201 7058
      4198 7061 4198 7063 4194 7052 4190 7052
TIME...MOT...LOC 2236Z 260DEG 25KT 4199 7075 4190 7089

JWD
Special weather statement, Jul 17, 7:21 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Boston/Norton MA
721 PM EDT Wed Jul 17 2019

MAZ018>022-180000-
Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA-
Western Plymouth MA-Barnstable MA-
721 PM EDT Wed Jul 17 2019

...STRONG THUNDERSTORM IN SOUTHEAST MASSACHUSETTS...

At 720 PM EDT, Doppler radar was tracking a strong thunderstorm near
Freetown and Fall River, moving east at 30 mph.

Winds of 40 mph, torrential rainfall, and frequent lightning will
accompany this storm.

This strong thunderstorm will be near...
  New Bedford and Acushnet around 730 PM EDT.
  Mattapoisett around 740 PM EDT.
  Rochester around 745 PM EDT.
  Marion around 750 PM EDT.
  Wareham around 755 PM EDT.
  Bourne around 800 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

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

Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.

&&

LAT...LON 4166 7055 4167 7069 4169 7069 4171 7068
      4172 7070 4167 7070 4171 7107 4179 7108
      4181 7054
TIME...MOT...LOC 2320Z 271DEG 28KT 4173 7102

JWD

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 17, 12:22 PM EDTSmall Craft AdvisoryBOX5 hr
Jul 17, 1:24 PM EDTFlash Flood WatchBOXBarnstable, Bristol, Essex, Franklin, Hampden, Hampshire and 5 more7 hr
Jul 17, 1:31 PM EDTSpecial Weather StatementBOXWorcester59 min
Jul 17, 2:06 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire, Worcester54 min
Jul 17, 2:44 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire61 min
Jul 17, 2:59 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Norfolk, Worcester61 min
Jul 17, 3:05 PM EDTFlash Flood WarningBOXMiddlesex, Worcester115 min
Jul 17, 3:53 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Norfolk, Plymouth, Suffolk67 min
Jul 17, 3:56 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire, Middlesex, Worcester47 min
Jul 17, 3:59 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Norfolk, Plymouth, Suffolk61 min
Jul 17, 4:00 PM EDTSpecial Marine WarningBOX30 min
Jul 17, 4:03 PM EDTFlash Flood WarningBOXMiddlesex, Norfolk, Plymouth, Suffolk117 min
Jul 17, 4:03 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Worcester57 min
Jul 17, 4:23 PM EDTSpecial Marine WarningBOX52 min
Jul 17, 4:24 PM EDTSpecial Marine WarningBOX66 min
Jul 17, 4:38 PM EDTSevere Thunderstorm WarningBOXBristol, Norfolk, Plymouth, Worcester52 min
Jul 17, 4:42 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Worcester48 min
Jul 17, 4:48 PM EDTSpecial Marine WarningBOX42 min
Jul 17, 4:49 PM EDTSevere Thunderstorm WarningBOXPlymouth26 min
Jul 17, 4:50 PM EDTSevere Thunderstorm WarningBOXEssex14 min
Jul 17, 4:51 PM EDTSpecial Marine WarningBOX39 min
Jul 17, 5:04 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Norfolk, Worcester41 min
Jul 17, 5:11 PM EDTSpecial Marine WarningBOX64 min
Jul 17, 5:19 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Norfolk, Suffolk, Worcester41 min
Jul 17, 5:20 PM EDTFlash Flood WarningBOXHampden, Worcester115 min
Jul 17, 5:23 PM EDTSpecial Marine WarningBOX67 min
Jul 17, 5:34 PM EDTSevere Thunderstorm WarningBOXNorfolk, Plymouth26 min
Jul 17, 5:38 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Norfolk, Suffolk, Worcester27 min
Jul 17, 5:41 PM EDTSpecial Marine WarningBOX49 min
Jul 17, 5:43 PM EDTFlash Flood WarningBOXBristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester2 hr
Jul 17, 5:50 PM EDTSpecial Weather StatementBOXPlymouth40 min
Jul 17, 6:09 PM EDTSpecial Marine WarningBOX66 min
Jul 17, 6:30 PM EDTSpecial Marine WarningBOX60 min
Jul 17, 6:33 PM EDTSevere Thunderstorm WarningBOXBarnstable57 min
Jul 17, 6:37 PM EDTSpecial Weather StatementBOXPlymouth38 min
Jul 17, 7:01 PM EDTSpecial Marine WarningBOX59 min
Jul 17, 4:34 PM EDTSpecial Weather StatementBOXProvidence41 min

Nearby

Special Weather Statements in Massachusetts, 2019Every special weather statement in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.