Alert archive / Rhode Island / Flash Flood Warnings in 2021

Flash Flood Warning 35, NWS Boston/Norton, MA

September 2, 2021Bristol County, Plymouth County, Massachusetts; 5 counties in Rhode Island

NWS Boston/Norton, MA issued this flash flood warning at Sep 2, 2021, 2:34 AM EDT for Bristol County, Plymouth County, Massachusetts; 5 counties in Rhode Island. It was in force for 6 hr. 6 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 2, 2021, 2:34 AM EDT (06:34 UTC)
Expired
Sep 2, 2021, 8:30 AM EDT
In force
6 hr
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Damage threat
Considerable
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), 32 km from the middle of the area, began a volume at 06:37 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 2, 2:47 AM EDTFLOOD2 Sw Fall River, MABEDFORD STREET AT STINZIANO STREET FLOODED AND IMPASSABLE.
Sep 2, 3:04 AM EDTFLOOD2 S Middletown, RIWOOD ROAD FLOODED AND IMPASSABLE. A RESIDENTS BASEMENT IS ALSO FLOODED.
Sep 2, 3:20 AM EDTFLOODFall River, MA24 NORTHBOUND RAMP ON I-195 FLOODED WITH TWO CARS STUCK IN THE FLOOD WATERS.
Sep 2, 3:21 AM EDTFLOOD1 Sse Somerset, MACOVE STREET FLOODED AND IMPASSABLE. CAR WAS STUCK IN THE FLOOD WATERS AND A PERSON NEEDED TO BE RESCUED.
Sep 2, 8:33 AM EDTHEAVY RAIN 9.5New Bedford, MA
Sep 2, 8:40 AM EDTHEAVY RAIN 5.5North Kingstown, RI

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 6.6 hours before the alert went out and 162 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, Brookhaven, NY at 00:00Z on 2021-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 123 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, Brookhaven, NY at 00:00Z on 2021-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 279 square meters per square second.19395878Sfc1 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
123 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
512 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
279 m²/s²
0-3 km storm-relative helicity
456 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted.

431 
WGUS51 KBOX 020634
FFWBOX
MAC005-023-RIC001-003-005-007-009-021230-
/O.NEW.KBOX.FF.W.0035.210902T0634Z-210902T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
234 AM EDT Thu Sep 2 2021

The National Weather Service in Norton has issued a

* Flash Flood Warning for...
  Bristol County in southeastern Massachusetts...
  Southwestern Plymouth County in southeastern Massachusetts...
  Bristol County in Rhode Island...
  Eastern Kent County in Rhode Island...
  Newport County in Rhode Island...
  Southeastern Providence County in Rhode Island...
  Northeastern Washington County in Rhode Island...

* Until 830 AM EDT.

* At 234 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 2 to 3 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 4157 7161 4183 7156 4191 7141 4191 7139
      4187 7108 4187 7106 4185 7092 4165 7079
      4157 7073 4149 7104 4137 7150 4136 7156

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Frank
1 follow-up statement
258 
WGUS71 KBOX 020757
FFSBOX

Flash Flood Statement
National Weather Service Boston/Norton MA
357 AM EDT Thu Sep 2 2021

MAC005-023-RIC001-003-005-007-009-021230-
/O.CON.KBOX.FF.W.0035.000000T0000Z-210902T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bristol MA-Plymouth MA-Bristol RI-Kent RI-Newport RI-Providence RI-
Washington RI-
357 AM EDT Thu Sep 2 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 AM EDT THIS 
MORNING FOR BRISTOL, SOUTHWESTERN PLYMOUTH, BRISTOL, EASTERN KENT, 
NEWPORT, SOUTHEASTERN PROVIDENCE AND NORTHEASTERN WASHINGTON 
COUNTIES...

At 357 AM EDT, trained weather spotters reported thunderstorms 
producing heavy rain across the warned area. There is significant 
urban flooding reported across the region particularly in Fall 
River. There are many roads acros Fall River that are currently 
impassable and some vehicles stuck in flood waters.


Between 2 and 4.5 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...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Trained spotters reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Providence, New Bedford, Fall River, Warwick, Cranston, Pawtucket, 
  Taunton, East Providence, Coventry, Dartmouth, Cumberland, North 
  Providence, South Kingstown, West Warwick, Johnston, North 
  Kingstown, Newport, Bristol, Attleboro and Middleborough.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 4157 7161 4183 7156 4191 7141 4191 7139
      4187 7108 4187 7106 4185 7092 4165 7079
      4157 7073 4149 7104 4137 7150 4136 7156

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Frank

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 9:13 PM EDTFlash Flood WarningBOXHampden10 hr
Sep 1, 9:24 PM EDTSpecial Marine WarningBOX66 min
Sep 1, 9:37 PM EDTFlash Flood WarningBOXWorcester10 hr
Sep 1, 10:01 PM EDTFlash Flood WarningBOXEssex, Middlesex, Norfolk, Suffolk8 hr
Sep 1, 10:32 PM EDTFlash Flood WarningBOXBristol, Norfolk, Plymouth10 hr
Sep 1, 10:45 PM EDTSpecial Marine WarningBOX45 min
Sep 1, 10:57 PM EDTFlash Flood WarningBOXFranklin, Hampshire, Middlesex, Worcester8 hr
Sep 1, 11:02 PM EDTFlash Flood WarningBOXEssex, Middlesex8 hr
Sep 1, 11:21 PM EDTTornado WarningBOXBarnstable, Bristol, Dukes, Plymouth54 min
Sep 1, 11:24 PM EDTSpecial Marine WarningBOX66 min
Sep 1, 11:32 PM EDTSpecial Marine WarningBOX58 min
Sep 1, 11:32 PM EDTSpecial Marine WarningBOX58 min
Sep 1, 11:56 PM EDTTornado WarningBOXBarnstable, Dukes49 min
Sep 2, 12:08 AM EDTFlash Flood WarningBOXBarnstable, Dukes8 hr
Sep 2, 12:20 AM EDTSpecial Marine WarningBOX55 min
Sep 2, 12:22 AM EDTTornado WarningBOXDukes53 min
Sep 2, 12:25 AM EDTSpecial Marine WarningBOX65 min
Sep 2, 12:45 AM EDTTornado WarningBOXBarnstable, Dukes60 min
Sep 2, 1:07 AM EDTSpecial Marine WarningBOX83 min
Sep 2, 1:15 AM EDTTornado WarningBOXDukes28 min
Sep 2, 1:51 AM EDTRiver Flood WarningBOXWorcester31 hr
Sep 2, 1:56 AM EDTTornado WarningBOXBarnstable26 min
Sep 2, 3:42 AM EDTRiver Flood WarningBOXNorfolk, Suffolk11 hr
Sep 2, 5:14 AM EDTSpecial Marine WarningBOX46 min
Sep 2, 5:26 AM EDTFlash Flood Warning Considerable damage threatBOXBarnstable, Bristol, Dukes, Plymouth3 hr
Sep 2, 5:30 AM EDTRiver Flood WarningBOXMiddlesex22 hr
Sep 2, 5:49 AM EDTSpecial Marine WarningBOX42 min
Sep 2, 6:02 AM EDTFlash Flood WarningBOXEssex, Middlesex, Norfolk, Suffolk3 hr
Sep 2, 6:14 AM EDTSpecial Marine WarningBOX25 min
Sep 2, 6:50 AM EDTAreal Flood WarningBOXFranklin, Hampden, Hampshire, Middlesex, Worcester6 hr
Sep 2, 7:04 AM EDTAreal Flood WarningBOXBristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more11 hr
Sep 2, 7:25 AM EDTFlash Flood Warning Considerable damage threatBOXHampden, Hampshire, Worcester6 hr
Sep 2, 7:43 AM EDTAreal Flood WarningBOXBristol, Norfolk, Plymouth, Worcester6 hr
Sep 2, 7:54 AM EDTAreal Flood WarningBOXBarnstable, Dukes, Plymouth6 hr
Sep 2, 8:14 AM EDTRiver Flood WarningBOXHampden, Hampshire13 hr
Sep 2, 8:20 AM EDTRiver Flood WarningBOXWorcester32 hr
Sep 2, 8:20 AM EDTRiver Flood WarningBOXMiddlesex, Worcester60 hr
Sep 2, 9:25 AM EDTRiver Flood WarningBOXBristol, Plymouth64 hr
Sep 2, 10:40 AM EDTSmall Craft AdvisoryBOX17 hr
Sep 2, 12:51 PM EDTAreal Flood WarningBOXFranklin, Hampden, Hampshire, Middlesex, Norfolk, Worcester6 hr
Sep 2, 1:28 PM EDTAreal Flood WarningBOXHampden6 hr
Sep 2, 1:42 PM EDTAreal Flood WarningBOXBristol, Norfolk, Plymouth, Worcester6 hr
Sep 2, 5:59 PM EDTRiver Flood WarningBOXEssex, Middlesex25 hr
Sep 1, 10:17 PM EDTFlash Flood WarningBOXBristol, Kent, Newport, Providence, Washington9 hr
Sep 2, 5:10 AM EDTRiver Flood WarningBOXKent, Providence18 hr
Sep 2, 8:20 AM EDTRiver Flood WarningBOXWashington43 hr
Sep 2, 8:20 AM EDTRiver Flood WarningBOXWashington53 hr

Nearby

Flash Flood Warnings in Rhode Island, 2021Flash Flood Warnings in Massachusetts, 2021Every flash flood warning in 2021

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.