Alert archive / Rhode Island / Flash Flood Warnings in 2018

Flash Flood Warning 32, NWS Boston/Norton, MA

September 18, 20185 counties in Rhode Island; Bristol County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Sep 18, 2018, 1:31 PM EDT for 5 counties in Rhode Island; Bristol County, Plymouth County, Massachusetts. It was in force for 4 hr. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Sep 18, 2018, 1:31 PM EDT (17:31 UTC)
Expired
Sep 18, 2018, 5:30 PM EDT
In force
4 hr
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Flood severity
None

Counties Bristol County, MA, Plymouth County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 36 km from the middle of the area, began a volume at 17:33 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.

What was reported inside it

TimeReportWhereRemark
Sep 18, 2:38 PM EDTFLASH FLOODRaynham, MAORCHARD STREET FLOODED AND IMPASSABLE
Sep 18, 2:54 PM EDTFLASH FLOODNew Bedford, MAI-195 WESTBOUND AT COGGESHALL STREET RAMP IS FLOODED AND IMPASSABLE
Sep 18, 2:54 PM EDTFLASH FLOODPlymouth, MAWATER STREET IS FLOODED AND IMPASSABLE
Sep 18, 2:57 PM EDTFLASH FLOODPlymouth, MAIN THE AREA OF 234 LONG POND ROAD IS FLOODED AND IMPASSABLE
Sep 18, 3:39 PM EDTHEAVY RAIN 2.81Taunton, MA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 4 storm reports to this flash flood warning; the first came 67 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 5.5 hours before the alert went out and 84 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 2018-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 165 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 12:00Z on 2018-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.193958Sfc1 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
165 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
648 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

297 
WGUS51 KBOX 181731
FFWBOX
MAC005-023-RIC001-003-005-007-009-182130-
/O.NEW.KBOX.FF.W.0032.180918T1731Z-180918T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
131 PM EDT TUE SEP 18 2018

The National Weather Service in Boston/Norton has issued a

* Flash Flood Warning for...
  Southern Plymouth County in southeastern Massachusetts...
  Bristol County in southeastern Massachusetts...
  Washington County in Rhode Island...
  Newport County in Rhode Island...
  Kent County in Rhode Island...
  Southern Providence County in Rhode Island...
  Bristol County in Rhode Island...

* Until 530 PM EDT.

* At 129 PM EDT Doppler radar indicated thunderstorms producing 
  heavy rain moving towards and across the warned area, which 
  includes southeast Massachusetts and central to southern Rhode 
  Island. Radar estimates rainfall rates of up to 1 to 3 inches per 
  hour with the thunderstorms. As a result, significant urban and 
  poor drainage flash flooding is expected during this afternoon. 
  Some small streams may also rise out of their banks. 

* Some locations that will experience flooding include...
  Providence, New Bedford, Fall River, Warwick, Cranston, Pawtucket,
  Plymouth, Taunton, East Providence, Coventry, Dartmouth, North
  Providence, South Kingstown, West Warwick, Johnston, Bridgewater,
  North Kingstown, Newport, Bristol and Marion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Flooding will occur quickly and could become life threatening for
those who try to drive through flooded roads or underpasses. Find
alternate routes and avoid flooded areas.

&&

LAT...LON 4131 7183 4142 7180 4177 7179 4204 7066
      4198 7063 4189 7051 4184 7052 4177 7062
      4177 7061 4167 7067 4171 7068 4172 7070
      4166 7070 4163 7079 4158 7081 4157 7087
      4159 7088 4155 7092 4144 7141 4141 7144

$$

NMB
1 follow-up statement
601 
WGUS71 KBOX 182140
FFSBOX

Flash Flood Statement
National Weather Service Boston/Norton MA
540 PM EDT TUE SEP 18 2018

MAC005-023-RIC001-003-005-007-009-182147-
/O.EXP.KBOX.FF.W.0032.000000T0000Z-180918T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Plymouth MA-Bristol MA-Washington RI-Newport RI-Kent RI-
Providence RI-Bristol RI-
540 PM EDT TUE SEP 18 2018

...THE FLASH FLOOD WARNING FOR SOUTHERN PLYMOUTH...BRISTOL...
WASHINGTON...NEWPORT...KENT...SOUTHERN PROVIDENCE AND BRISTOL
COUNTIES HAS EXPIRED...

The heavy rain has ended. Any lingering flooding will gradually 
receded over the next hour or so. Please continue to heed any 
remaining road closures.

LAT...LON 4131 7183 4142 7180 4177 7179 4204 7066
      4198 7063 4189 7051 4184 7052 4177 7062
      4177 7061 4167 7067 4171 7068 4172 7070
      4166 7070 4163 7079 4158 7081 4157 7087
      4159 7088 4155 7092 4144 7141 4141 7144

$$

Belk

What forecasters said that day

The local office's own words before this flash flood warning 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 flash flood warning went out at Sep 18, 10:11 AM EDT, 3 hours 20 minutes earlier.

Area forecast discussion, Sep 18, 10:11 AM EDT, 3 hours 20 minutes before
Area Forecast Discussion
National Weather Service Boston/Norton MA
1011 AM EDT Tue Sep 18 2018

.SYNOPSIS...
The remnants of Florence will bring heavy rainfall along with
the threat for flash flooding today. High pressure will build
south from eastern Canada with a gusty northeast wind Wednesday
and Thursday. A warm front will lift north Thursday night, with
southerly winds bringing mild temperatures on Friday. A cold
front will sweep across the region Friday night, with mainly
dry but cooler conditions for the upcoming weekend.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...

10 AM Update...

Flash Flood Threat...

Already 2-4" of rainfall across northern MA! PWAT field
confirming remnants of Florence moving across the area with
PWATs up to 2.1 inches across CT/RI into eastern MA. Just as
impressive are dew pts now in the mid 70s (75F at IJD-EWB-
OWD!!!) Thus area of rain moving into a tropical environment.
Latest runs of the HRRR show this area of torrential rain over
northern MA holding together and maintaining its intensity as it
slides southward into tropical airmass and better instability
across CT/RI and southeast MA later this morning and afternoon.
Thus will continue with Flash Flood Watches for these areas.
Expect rainfall rates on the order of 1-2" per hour at times as
this torrential rainfall band over northern MA slides southward.

Tornado threat...

Bulk of heavy showers on the cool side of the boundary in the
northerly flow. Concern will be farther south in the warm sector
across CT/RI and south of the MA Pike where some low level
(0-3km) CAPE exist along with EHI (storm rotation maximized
where CAPE & SRH overlap) around 1. Risk of an isolated tornado
is very low in this area but not zero especially with frontal
wave developing and increasing low level shear in the presence
of low LCLs and high dew pts. Low level instability will be key.

Previous Discussion...

* Heavy rainfall and flash flood threat today *
* Low risk for a very localized tornado this morning *

Remnants of Florence will bring heavy rainfall today within
tropical environment with PWATs exceeding 2 inches, but
uncertainty remains in the location of the max QPF. GFS/NAM
focus heaviest rainfall across northern MA with much less near
the coast. WRF-ARW/NMM also show a max near MA/NH/VT border but
have a secondary max across eastern CT/RI and SE MA. HREF heavy
rainfall probs focus heaviest rainfall across northern MA.

Low level frontal boundary and assocd strong convergence will
initially focus heavy rain across northern MA this morning, then
axis of heavier rain will shift southward this afternoon as the
low level front moves south. It does appear the convergence
weakens a bit as the front moves south this afternoon. However,
models indicate better instability south of the Pike this
afternoon with CAPES up to 1000 J/kg so potential for a few
t-storms with heavy rainfall rates across eastern CT/RI and SE
MA, although this may be more localized. Will continue flash
flood watches with greatest risk likely across northern MA where
HREF indicating highest probs of 3+ inches of rain. Expected
rainfall of 1-3 inches, heaviest northern MA where locally
higher amounts possible, but amounts could be less than an inch
near the south coast.

Regarding severe weather threat, MUCAPES forecast to increase
up to 500 J/kg toward 12z. Already seeing convective elements
developing across eastern PA/NJ where instability is greater.
Will have to watch this convection closely as it lifts NE. While
deep layer shear is marginal, approaching low level jet will
lead to increasing low level shear so will have to watch any
convection for possible rotating storms. RAP 0-1km shear
increases to 25-30 kt with 0-1km helicity 200-300 units. Given
tropical environment with high dewpoints in the 70s and low
LCLs, there is a low risk for an isolated tornado this morning
across the interior if enough instability can be generated.
However, instability may be the missing ingredient as the low
level jet and resulting shear may be moving out of the area
before sufficient instability develops. Will monitor closely.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM WEDNESDAY/...
Showers and heavy rainfall threat will move south of the coast
this evening followed by a mostly dry night. However, areas of
drizzle may develop overnight in eastern New Eng as NE flow
develops. There is a strong signal for stratus and fog
overspreading the region from the Gulf of Maine.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...
Highlights...

* Fast wind flow aloft will bring changeable conditions into
  next weekend
* A warm front pushes north Thu night, followed by a cold front
  late Fri night into early Sat
* Below normal temperatures through mid week, then briefly mild
  late week before a return to cool readings

Overview...

H5 short wave will push E through around midday Wednesday.
There may be a few leftover showers or some spotty drizzle
during the morning, then conditions should improve though it
will remain cool with a gusty northeasterly wind. Mid level
ridging builds across the Great Lakes into south central
Canada, keeping a general W-NW steering flow in place across
the northeast through most of this period. High pressure builds
across through mid week, bringing dry conditions but a
persistent onshore wind flow that will keep temperatures below
normal.

A short wave rides eastward in the fast flow aloft by late this
week, with a warm front approaching Thu night into Fri. A few
showers may push into NW Mass Thu night with the front, but most
of the precip looks to remain out of the region. Winds will
shift to southerly by around daybreak Friday. Dewpoints will
increase as well, so there could be some patchy fog developing
during the early morning hours Fri. Will see mild temps, with
readings topping off in the 70-75 degree range Fri afternoon.
However, with the mid level ridge pushing across the region,
will see another cold front approach Fri night, bringing
scattered showers and possibly a few thunderstorms.

The front pushes offshore Sat morning, with another large high
building out of central Canada. This will bring another shot of
dry but cool conditions through the upcoming weekend into early
next week.

&&

.AVIATION /14Z TUESDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...

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

Short Term /through Tonight/...

14z update...

Torrential rainfall at times today with hourly rainfall rates on
the order of 1-2 inches per hour at times. Significant wind
shift from SSW to NNW moving across the region from NW to SE
today. Mainly MVFR but IFR at times. Earlier discussion below.

=================================================================

Through Today...Moderate confidence.
Variable conditions, mainly IFR-LIFR across central and N Mass
in -RA with areas of +RA, ranging to MVFR and even some low end
VFR conditions across SE Mass at 11Z. As more organized precip
shifts E-NE across the region this morning, will see more
widespread MVFR-IFR conditions as RA/+RA. Isold +TSRA initially
focused across western and northern MA this morning will move
south toward the coast through the afternoon. Conditions may
improve to VFR aft 18z western MA and CT Valley. Risk of LLWS
over SE New England.

Tonight...Moderate confidence.
Continued MVFR-IFR CIGS across central and eastern New Eng with
VFR in the west. Rain near the south coast will move offshore
in the evening. IFR stratus will redevelop and overspread
eastern New Eng from the Gulf of Maine after midnight within
developing N-NE flow. Areas of drizzle and fog also possible.

KBOS Terminal...Moderate confidence in TAF. Should see mainly
MVFR CIGS/VSBYS through the remainder of the morning push, then
should lower to IFR as heavier RA/+RA moves in, probably by
15Z-17Z. Still uncertain on exact timing of the lower
conditions.

KBDL Terminal...Moderate confidence in TAF. Uncertainty lies
with the exact timing of onset of heaviest showers and lower
conditions.

Outlook /Wednesday through Saturday/...

Wednesday: Mainly VFR, with local IFR possible. Breezy.

Wednesday Night through Thursday: Mainly VFR, with local MVFR
possible. Breezy.

Thursday Night: Mainly VFR, with local IFR possible. Slight
chance SHRA.

Friday: Mainly VFR, with local MVFR possible. Breezy. Slight
chance SHRA.

Friday Night: Mainly VFR, with local IFR possible. Breezy.
Slight chance SHRA, patchy BR.

Saturday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

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

Short Term /through Tonight/...

10 AM update...

SSW winds 15-20 kt with gusts up to 25 kt but wind shift line
slipping southward down the NH/ME coastline with a wind shift to
the NNE with gusts up to 25 kt. Torrential downpours in showers
thru the afternoon. Previous discussion below.

=================================================================

Today...Moderate confidence.
Modest low level jet will result in S-SW wind gusts increasing
to 25 kt, especially over south coastal waters with building
seas to 5 ft. SCA headlines will continue. Bands of heavy
showers and isolated thunderstorms are expected with the
remnants of Florence. Fog patches are possible too...both which
may reduce vsbys for mariners at times.

Tonight...Moderate confidence.
Winds shift to N then NE, increasing to 15-25 kt late tonight,
especially over eastern MA waters. Vsbys may be reduced in fog
at times.

Outlook /Wednesday through Saturday/...

Wednesday: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Seas up to 5 ft. Patchy fog.

Wednesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Local rough seas.

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

Friday: Low risk for Small Craft Advisory winds with gusts up
to 30 kt. Seas up to 5 ft.

Friday Night: Moderate risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain
showers, patchy fog. Areas of visibility 1 to 3 nm.

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Flash Flood Watch through late tonight for CTZ002>004.
MA...Flash Flood Watch through late tonight for MAZ002>019-026.
RI...Flash Flood Watch through late tonight for RIZ001>004.
MARINE...Small Craft Advisory until 8 AM EDT Wednesday for ANZ231>235-
     237-254>256.
     Small Craft Advisory until 1 PM EDT this afternoon for ANZ236.
     Small Craft Advisory until 8 AM EDT Wednesday for ANZ250.

&&

SYNOPSIS...KJC/EVT
NEAR TERM...KJC/Nocera/EVT
SHORT TERM...KJC
LONG TERM...EVT
AVIATION...KJC/Nocera/EVT
MARINE...KJC/Nocera/EVT
Hazardous weather outlook, Sep 18, 3:31 AM EDT, 10 hours before
Hazardous Weather Outlook
National Weather Service Boston/Norton MA
331 AM EDT Tue Sep 18 2018

CTZ002>004-MAZ002>019-026-RIZ001>004-190745-
Hartford CT-Tolland CT-Windham CT-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-
Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA-
Suffolk MA-Eastern Norfolk MA-Northern Bristol MA-
Western Plymouth MA-Eastern Plymouth MA-Northern Middlesex MA-
Northwest Providence RI-Southeast Providence RI-Western Kent RI-
Eastern Kent RI-
331 AM EDT Tue Sep 18 2018

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

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

.DAY ONE...Today and 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...Wednesday through Monday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ020>024-RIZ005>008-190745-
Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA-
Nantucket MA-Bristol RI-Washington RI-Newport RI-Block Island RI-
331 AM EDT Tue Sep 18 2018

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

.DAY ONE...Today and tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230>237-250-251-254>256-190745-
Boston Harbor-Cape Cod Bay-Nantucket Sound-Vineyard Sound-
Buzzards Bay-Rhode Island Sound-Narragansett Bay-Block Island 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-
Coastal Waters from Montauk NY to Marthas Vineyard extending out to
20 nm South of Block Island-
331 AM EDT Tue Sep 18 2018

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

.DAY ONE...Today and tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...

There may be a period of N-NE wind gusts close to gale force across
the open waters south and east of Cape Cod and the islands from late
Wednesday morning through the afternoon. Gale headlines may be
required.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

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

In the hours before

Special weather statement, Sep 18, 11:22 AM EDT, 2 hours 9 minutes before
Special Weather Statement
National Weather Service Boston/Norton MA
1122 AM EDT TUE SEP 18 2018

CTZ004-MAZ012-013-016>019-RIZ001-002-181615-
Windham CT-Southern Worcester MA-Eastern Plymouth MA-
Northern Bristol MA-Western Norfolk MA-Eastern Norfolk MA-
Western Plymouth MA-Northwest Providence RI-Southeast Providence RI-
1122 AM EDT TUE SEP 18 2018

...LINE OF SHOWERS AND EMBEDDED THUNDERSTORMS...

At 1120 AM EDT, Doppler radar was tracking a line of showers and
embedded thunderstorms from near Hull to Walpole and Putnam.
Movement was east at 35 mph.

Wind gusts to 40 mph and torrential rainfall will accompany these
storms as they head across northern Rhode Island and eastern
Massachusetts through 1230 PM.

Locations impacted include...
Providence, Brockton, Quincy, Cranston, Pawtucket, Taunton, Weymouth,
East Providence, Woonsocket, Braintree, Cumberland, Randolph, North
Providence, Franklin, Johnston, North Attleborough, Norwood,
Stoughton, Bridgewater and Marshfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when these showers and 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.

These storms may intensify and become capable of producing damage.
Stay tuned for updated statements and possible warnings.

&&

LAT...LON 4179 7140 4188 7205 4211 7130 4230 7086
      4230 7084 4227 7080 4227 7076 4226 7074
      4221 7070 4218 7071 4207 7063
TIME...MOT...LOC 1520Z 274DEG 28KT 4230 7087 4212 7125 4190 7190

JWD
Special weather statement, Sep 18, 12:07 PM EDT, 1 hour 24 minutes before
Special Weather Statement
National Weather Service Boston/Norton MA
1207 PM EDT TUE SEP 18 2018

CTZ004-MAZ012-RIZ001-181630-
Windham CT-Southern Worcester MA-Northwest Providence RI-
1207 PM EDT TUE SEP 18 2018

...HEAVY SHOWER WITH STRONG GUSTY WINDS...

At 1205 PM EDT, Doppler radar was tracking a heavy shower
over Putnam, or 15 miles north of Plainfield, moving east at 45 mph.
Winds in excess of 40 mph were likely occurring with this shower.
Some thunder is possible.

Locations impacted include...
Woonsocket, Smithfield, Burrillville, Uxbridge, North Smithfield,
Glocester, Putnam, Thompson, Blackstone, Douglas, Woodstock, Pomfret
and Millville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough
to produce minor damage, such as a few downed branches. It may
intensify and become capable of producing damage.
Stay tuned for updated statements and possible warnings.

&&

LAT...LON 4189 7196 4194 7198 4206 7155 4192 7149
TIME...MOT...LOC 1605Z 255DEG 39KT 4193 7190

Field
Local storm report, Sep 18, 12:08 PM EDT, 1 hour 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
1208 PM EDT TUE SEP 18 2018

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

1103 AM     FLASH FLOOD      LYNNFIELD               42.54N  71.04W
09/18/2018                   ESSEX              MA   AMATEUR RADIO

            CAR STUCK IN FLOOD WATERS AT MAIN STREET AT LOWELL
            STREET

1107 AM     TSTM WND DMG     NAHANT                  42.43N  70.92W
09/18/2018                   ESSEX              MA   AMATEUR RADIO

            TREE DOWN AT CASTLE AND PHILLIPS STREET

1108 AM     TSTM WND DMG     SAUGUS                  42.47N  71.02W
09/18/2018                   ESSEX              MA   AMATEUR RADIO

            SEVERAL TREES DOWN ON RIVERSIDE COURT

1110 AM     TSTM WND DMG     SAUGUS                  42.47N  71.02W
09/18/2018                   ESSEX              MA   AMATEUR RADIO

            TREE AND WIRES DOWN ON BALLARD STREET

&&

EVENT NUMBER BOX1804569
EVENT NUMBER BOX1804570
EVENT NUMBER BOX1804571
EVENT NUMBER BOX1804572

LEC
Special weather statement, Sep 18, 12:36 PM EDT, 55 minutes before
Special Weather Statement
National Weather Service Boston/Norton MA
1236 PM EDT TUE SEP 18 2018

CTZ002>004-RIZ001-181715-
Hartford CT-Tolland CT-Windham CT-Northwest Providence RI-
1236 PM EDT TUE SEP 18 2018

...LINE OF STRONG THUNDERSTORMS IN NORTHEAST CONNECTICUT...

At 1235 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Eastford to near East Hampton. Movement was
east at 35 mph.

Winds in excess of 40 mph and heavy rain will accompany these
storms.

Locations impacted include...
Mansfield, Windham, Plainfield, Willimantic, Killingly, Burrillville,
Coventry, North Smithfield, Glocester, Hebron, Putnam, Thompson,
Brooklyn, Woodstock, Lebanon, Marlborough, Columbia, Canterbury,
Foster and Ashford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4191 7212 4199 7156 4164 7192 4166 7216
      4171 7224 4169 7227 4167 7227 4164 7233
      4161 7233 4160 7234 4160 7238 4159 7239
      4160 7241 4159 7242 4159 7246
TIME...MOT...LOC 1635Z 254DEG 33KT 4188 7210 4158 7243

FIELD
Local storm report, Sep 18, 12:57 PM EDT, 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
1257 PM EDT TUE SEP 18 2018

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

1059 AM     FLASH FLOOD      NEWTON                  42.33N  71.21W
09/18/2018                   MIDDLESEX          MA   AMATEUR RADIO

            SECTION OF BEACON STREET IN THE AREA OF 85 BEACON
            STREET CLOSED DUE TO FLOODING

1100 AM     FLASH FLOOD      WALTHAM                 42.39N  71.24W
09/18/2018                   MIDDLESEX          MA   AMATEUR RADIO

            AREA OF 840 WINTER STREET IS FLOODED AND IMPASSABLE

1103 AM     FLASH FLOOD      WALTHAM                 42.39N  71.24W
09/18/2018                   MIDDLESEX          MA   AMATEUR RADIO

            LEXINGTON STREET PRIOR TO RIVER FOREST FLOODED AND
            IMPASSABLE

1103 AM     FLASH FLOOD      WALTHAM                 42.39N  71.24W
09/18/2018                   MIDDLESEX          MA   AMATEUR RADIO

            WINTER STREET BY DUFFYS POND IS FLOODED AND IMPASSABLE.
            CAR STUCK IN FLOOD WATERS.

1106 AM     FLASH FLOOD      DANVERS                 42.57N  70.95W
09/18/2018                   ESSEX              MA   AMATEUR RADIO

            SECTION OF ROUTE 114 IN BOTH DIRECTIONS ARE FLOODED AND
            IMPASSABLE

1107 AM     FLASH FLOOD      ARLINGTON               42.42N  71.16W
09/18/2018                   MIDDLESEX          MA   AMATEUR RADIO

            HAMILTON ROAD AT LAKE HILL FLOODED AND IMPASSABLE

1108 AM     FLASH FLOOD      HAMILTON                42.62N  70.87W
09/18/2018                   ESSEX              MA   AMATEUR RADIO

            WALNUT STREET AND RAILROAD AVE FLOODED AND IMPASSABLE

1108 AM     FLASH FLOOD      WATERTOWN               42.37N  71.18W
09/18/2018                   MIDDLESEX          MA   AMATEUR RADIO

            ROAD FLOODED AT 103 SUMMER STREET

1235 PM     FLASH FLOOD      BELLINGHAM              42.09N  71.47W
09/18/2018                   NORFOLK            MA   AMATEUR RADIO

            CAROLINE DRIVE IS FLOODED AND IMPASSABLE. WATER UP TO
            CAR BUMPER.

1238 PM     FLASH FLOOD      NORWOOD                 42.19N  71.20W
09/18/2018                   NORFOLK            MA   AMATEUR RADIO

            ROUTE 1 AT PLEASANT STREET IS CLOSED DUE TO FLOODING

&&

EVENT NUMBER BOX1804573
EVENT NUMBER BOX1804574
EVENT NUMBER BOX1804575
EVENT NUMBER BOX1804576
EVENT NUMBER BOX1804577
EVENT NUMBER BOX1804578
EVENT NUMBER BOX1804579
EVENT NUMBER BOX1804580
EVENT NUMBER BOX1804581
EVENT NUMBER BOX1804582

LEC
Special weather statement, Sep 18, 12:58 PM EDT, 33 minutes before
Special Weather Statement
National Weather Service Boston/Norton MA
1258 PM EDT TUE SEP 18 2018

MAZ017>020-RIZ001>005-181800-
Eastern Plymouth MA-Northern Bristol MA-Southern Bristol MA-
Western Plymouth MA-Northwest Providence RI-Bristol RI-
Eastern Kent RI-Western Kent RI-Southeast Providence RI-
1258 PM EDT TUE SEP 18 2018

...GUSTY WINDS OUT AHEAD OF THUNDERSTORMS IN SOUTHEAST
MASSACHUSETTS AND EASTERN RHODE ISLAND...

At 1254 PM EDT, Doppler radar was tracking strong wind gusts to 30
to 40 mph along a line extending from near Duxbury to Scituate.
Movement was south at 10 mph.  The winds were well out ahead of
thunderstorms which were farther to the north.

Winds in excess of 30 mph can be expected. There will also be
pockets of minor urban and poor drainage flooding.

Locations impacted include...
Providence, Warwick, Cranston, Pawtucket, Plymouth, Taunton, East
Providence, Coventry, North Providence, West Warwick, Johnston,
Bridgewater, Marshfield, Attleboro, Middleborough, Norton, Somerset,
Pembroke, Barrington and Swansea.

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 attempt
to drive through flooded waters.

&&

LAT...LON 4165 7154 4180 7163 4208 7064 4201 7058
      4198 7063 4194 7053
TIME...MOT...LOC 1654Z 044DEG 8KT 4207 7067 4179 7163

Field

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 8:21 AM EDTSpecial Weather StatementBOXProvidence54 min
Sep 18, 11:22 AM EDTSpecial Weather StatementBOXProvidence53 min
Sep 18, 11:23 AM EDTFlash Flood WarningBOXProvidence4 hr
Sep 18, 12:07 PM EDTSpecial Weather StatementBOXProvidence23 min
Sep 18, 2:07 PM EDTSpecial Weather StatementBOXBristol, Newport, Washington38 min
Sep 18, 3:14 PM EDTAreal Flood WarningBOXProvidence3 hr
Sep 18, 7:54 AM EDTSpecial Weather StatementBOXFranklin, Hampshire81 min
Sep 18, 8:52 AM EDTFlash Flood WarningBOXFranklin, Hampshire, Middlesex, Worcester4 hr
Sep 18, 9:09 AM EDTSpecial Weather StatementBOXHampden, Worcester36 min
Sep 18, 9:32 AM EDTSpecial Weather StatementBOXEssex, Middlesex88 min
Sep 18, 9:50 AM EDTSpecial Weather StatementBOXHampden, Worcester85 min
Sep 18, 10:12 AM EDTSpecial Weather StatementBOXEssex48 min
Sep 18, 10:17 AM EDTFlash Flood WarningBOXEssex, Middlesex, Norfolk, Suffolk, Worcester4 hr
Sep 18, 10:34 AM EDTSpecial Weather StatementBOXEssex41 min
Sep 18, 10:45 AM EDTSevere Thunderstorm WarningBOXEssex, Middlesex30 min
Sep 18, 10:56 AM EDTSpecial Marine WarningBOX64 min
Sep 18, 10:58 AM EDTFlash Flood WarningBOXHampden, Hampshire, Worcester4 hr
Sep 18, 11:00 AM EDTTornado WarningBOXEssex15 min
Sep 18, 11:07 AM EDTRiver Flood WarningBOXWorcester9 hr
Sep 18, 11:09 AM EDTSpecial Marine WarningBOX66 min
Sep 18, 11:58 AM EDTSpecial Marine WarningBOX62 min
Sep 18, 12:20 PM EDTSpecial Marine WarningBOX25 min
Sep 18, 12:32 PM EDTAreal Flood WarningBOXFranklin, Hampshire, Middlesex, Worcester4 hr
Sep 18, 12:49 PM EDTSpecial Marine WarningBOX86 min
Sep 18, 12:58 PM EDTSpecial Weather StatementBOXPlymouth62 min
Sep 18, 1:10 PM EDTSpecial Marine WarningBOX80 min
Sep 18, 2:01 PM EDTAreal Flood WarningBOXEssex, Middlesex, Norfolk, Suffolk, Worcester4 hr
Sep 18, 2:27 PM EDTSevere Thunderstorm WarningBOXBarnstable, Plymouth33 min
Sep 18, 2:31 PM EDTSpecial Marine WarningBOX44 min
Sep 18, 2:59 PM EDTSpecial Marine WarningBOX46 min
Sep 18, 3:04 PM EDTSevere Thunderstorm WarningBOXBarnstable41 min
Sep 18, 3:05 PM EDTFlash Flood WarningBOXBarnstable115 min
Sep 18, 3:22 PM EDTSpecial Marine WarningBOX53 min
Sep 18, 3:59 PM EDTSpecial Marine WarningBOX46 min
Sep 18, 4:01 PM EDTSmall Craft AdvisoryBOX60 hr

Nearby

Flash Flood Warnings in Rhode Island, 2018Flash Flood Warnings in Massachusetts, 2018Every flash flood warning in 2018

Sources

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