Alert archive / Massachusetts / Flash Flood Watches in 2021
Flash Flood Watch 5, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood watch at Aug 4, 2021, 3:11 AM EDT for 5 counties in Rhode Island; 7 counties in Massachusetts; Northeastern Connecticut Planning Region, Connecticut. It took effect at Aug 4, 2021, 8:00 PM EDT. It was in force for 17 hr.
The area
The counties it named.
The facts
- Issued
- Aug 4, 2021, 3:11 AM EDT (07:11 UTC)
- In effect from
- Aug 4, 2021, 8:00 PM EDT
- Expired
- Aug 5, 2021, 12:48 PM EDT
- In force
- 17 hr
- Issued by
- NWS Boston/Norton, MA
- Flood severity
- None
Counties Northeastern Connecticut Planning Region, CT, Bristol County, MA, Essex County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI
The radar
The Boston radar (KBOX), 18 km from the middle of the area, began a volume at 07:13 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
Brookhaven, NY (KOKX), launched 00:00Z, 7.2 hours before the alert went out and 177 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1760 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
861 WGUS61 KBOX 040711 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 311 AM EDT Wed Aug 4 2021 MAZ005>007-013>021-RIZ001>008-041515- /O.NEW.KBOX.FF.A.0005.210805T0000Z-210805T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Middlesex MA-Western Essex MA-Eastern Essex MA-Western Norfolk MA-Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA- Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA-Northwest Providence RI-Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-Washington RI-Newport RI-Block Island RI- Including the cities of Quincy, Foxborough, West Warwick, Providence, Foster, Warwick, Smithfield, Lowell, Lawrence, Mattapoisett, West Greenwich, Brockton, New Bedford, Norwood, Coventry, Plymouth, Newport, Bristol, New Shoreham, Gloucester, Westerly, Cambridge, Narragansett, Fall River, Taunton, Boston, Framingham, and East Greenwich 311 AM EDT Wed Aug 4 2021 ...FLASH FLOOD WATCH IN EFFECT FROM THIS EVENING THROUGH THURSDAY MORNING... The National Weather Service in Norton has issued a * Flash Flood Watch for portions of Massachusetts and Rhode Island, including the following areas, in Massachusetts, Central Middlesex MA, Eastern Essex MA, Eastern Norfolk MA, Eastern Plymouth MA, Northern Bristol MA, Southeast Middlesex MA, Southern Bristol MA, Southern Plymouth MA, Suffolk MA, Western Essex MA, Western Norfolk MA and Western Plymouth MA. In Rhode Island, Block Island RI, Bristol RI, Eastern Kent RI, Newport RI, Northwest Providence RI, Southeast Providence RI, Washington RI and Western Kent RI. * From this evening through Thursday morning. * Showers and a few thunderstorms will bring heavy rainfall to portions of Rhode Island and eastern Massachusetts tonight. Rainfall amounts of 1 to 3 inches with locally up to 4 inches are possible. The axis of heaviest rainfall is somewhat uncertain and may still shift east or west. * Heavy rainfall may cause street flooding and result in rapid rises on small streams and creeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ KJC
4 follow-up statements
227 WGUS61 KBOX 041424 FFABOX Flood Watch National Weather Service Boston/Norton MA 1024 AM EDT Wed Aug 4 2021 MAZ005>007-013>021-RIZ001>008-042230- /O.CON.KBOX.FF.A.0005.210805T0000Z-210805T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Middlesex MA-Western Essex MA-Eastern Essex MA- Western Norfolk MA-Southeast Middlesex MA-Suffolk MA- Eastern Norfolk MA-Northern Bristol MA-Western Plymouth MA- Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA- Northwest Providence RI-Southeast Providence RI-Western Kent RI- Eastern Kent RI-Bristol RI-Washington RI-Newport RI- Block Island RI- Including the cities of Framingham, Lowell, Lawrence, Gloucester, Foxborough, Norwood, Cambridge, Boston, Quincy, Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Foster, Smithfield, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, Newport, and New Shoreham 1024 AM EDT Wed Aug 4 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of Massachusetts and Rhode Island, including the following areas, in Massachusetts, Central Middlesex MA, Eastern Essex MA, Eastern Norfolk MA, Eastern Plymouth MA, Northern Bristol MA, Southeast Middlesex MA, Southern Bristol MA, Southern Plymouth MA, Suffolk MA, Western Essex MA, Western Norfolk MA, and Western Plymouth MA. In Rhode Island, Block Island RI, Bristol RI, Eastern Kent RI, Newport RI, Northwest Providence RI, Southeast Providence RI, Washington RI, and Western Kent RI. * From 8 PM EDT this evening through Thursday morning * Showers and a few thunderstorms will bring heavy rainfall to portions of Rhode Island and eastern Massachusetts tonight. Rainfall amounts of 1 to 3 inches with locally up to 4 inches are possible. The axis of heaviest rainfall is somewhat uncertain and may still shift east or west. * Heavy rainfall may cause street flooding and result in rapid rises on small streams and creeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
023 WGUS61 KBOX 041846 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 246 PM EDT Wed Aug 4 2021 CTZ004-MAZ012-050815- /O.EXA.KBOX.FF.A.0005.210805T0000Z-210805T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Windham CT-Southern Worcester MA- Including the cities of Worcester, Willimantic, Milford, and Putnam 246 PM EDT Wed Aug 4 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH THURSDAY MORNING... The National Weather Service in Norton has expanded the * Flash Flood Watch to include portions of northern Connecticut and central Massachusetts, including the following areas, in northern Connecticut, Windham CT. In central Massachusetts, Southern Worcester MA. * From 8 PM EDT this evening through Thursday morning. * Showers and a few thunderstorms will bring heavy rainfall to portions of Rhode Island and eastern Massachusetts tonight. Rainfall amounts of 1 to 3 inches with locally up to 4 inches are possible. The axis of heaviest rainfall is somewhat uncertain and may still shift east or west. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ MAZ005>007-013>021-RIZ001>008-050815- /O.CON.KBOX.FF.A.0005.210805T0000Z-210805T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Middlesex MA-Western Essex MA-Eastern Essex MA-Western Norfolk MA-Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA- Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA-Northwest Providence RI-Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-Washington RI-Newport RI-Block Island RI- Including the cities of Quincy, Foxborough, West Warwick, Providence, Foster, Warwick, Smithfield, Lowell, Lawrence, Mattapoisett, West Greenwich, Brockton, New Bedford, Norwood, Coventry, Plymouth, Newport, Bristol, New Shoreham, Gloucester, Westerly, Cambridge, Narragansett, Fall River, Taunton, Boston, Framingham, and East Greenwich 246 PM EDT Wed Aug 4 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of Massachusetts and Rhode Island, including the following areas, in Massachusetts, Central Middlesex MA, Eastern Essex MA, Eastern Norfolk MA, Eastern Plymouth MA, Northern Bristol MA, Southeast Middlesex MA, Southern Bristol MA, Southern Plymouth MA, Suffolk MA, Western Essex MA, Western Norfolk MA and Western Plymouth MA. In Rhode Island, Block Island RI, Bristol RI, Eastern Kent RI, Newport RI, Northwest Providence RI, Southeast Providence RI, Washington RI and Western Kent RI. * From 8 PM EDT this evening through Thursday morning. * Showers and a few thunderstorms will bring heavy rainfall to portions of Rhode Island and eastern Massachusetts tonight. Rainfall amounts of 1 to 3 inches with locally up to 4 inches are possible. The axis of heaviest rainfall is somewhat uncertain and may still shift east or west. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ BW
850 WGUS61 KBOX 050719 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 319 AM EDT Thu Aug 5 2021 CTZ004-MAZ012-050830- /O.CAN.KBOX.FF.A.0005.000000T0000Z-210805T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Windham CT-Southern Worcester MA- Including the cities of Worcester, Willimantic, Milford, and Putnam 319 AM EDT Thu Aug 5 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northern Connecticut and central Massachusetts, including the following areas, in northern Connecticut, Windham CT. In central Massachusetts, Southern Worcester MA has been cancelled. The heaviest rainfall is expected to fall to east of the area. Flooding is no longer expected to pose a threat. $$ MAZ005>007-013>021-RIZ001>008-052000- /O.EXT.KBOX.FF.A.0005.000000T0000Z-210805T2200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Middlesex MA-Western Essex MA-Eastern Essex MA-Western Norfolk MA-Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA- Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA-Northwest Providence RI-Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-Washington RI-Newport RI-Block Island RI- Including the cities of Quincy, Foxborough, West Warwick, Providence, Foster, Warwick, Smithfield, Lowell, Lawrence, Mattapoisett, West Greenwich, Brockton, New Bedford, Norwood, Coventry, Plymouth, Newport, Bristol, New Shoreham, Gloucester, Westerly, Cambridge, Narragansett, Fall River, Taunton, Boston, Framingham, and East Greenwich 319 AM EDT Thu Aug 5 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH 6 PM THIS AFTERNOON... The Flash Flood Watch is now in effect for * Portions of Massachusetts and Rhode Island, including the following areas, in Massachusetts, Central Middlesex MA, Eastern Essex MA, Eastern Norfolk MA, Eastern Plymouth MA, Northern Bristol MA, Southeast Middlesex MA, Southern Bristol MA, Southern Plymouth MA, Suffolk MA, Western Essex MA, Western Norfolk MA and Western Plymouth MA. In Rhode Island, Block Island RI, Bristol RI, Eastern Kent RI, Newport RI, Northwest Providence RI, Southeast Providence RI, Washington RI and Western Kent RI. * Through this afternoon. * Periods of showers and a few thunderstorms will continue to bring locally heavy rain to Rhode Island and portions of eastern Massachusetts through late this afternoon. Up to an additional one and a half inches of rain is forecast through this afternoon, with total rainfall ranging between 2 to 3 inches. Locally higher rainfall amounts are possible in areas that experience persistent heavy rains. * Heavy rainfall may cause street flooding in urban areas and in low-lying and poor drainage areas. It may also result in rapid rises on small streams and creeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ AL
618 WGUS61 KBOX 051648 FFABOX Flood Watch National Weather Service Boston/Norton MA 1248 PM EDT Thu Aug 5 2021 MAZ005>007-013>021-RIZ001>008-051800- /O.CAN.KBOX.FF.A.0005.000000T0000Z-210805T2200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Middlesex MA-Western Essex MA-Eastern Essex MA-Western Norfolk MA-Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA- Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA-Northwest Providence RI-Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-Washington RI-Newport RI-Block Island RI- Including the cities of Quincy, Foxborough, West Warwick, Providence, Foster, Warwick, Smithfield, Lowell, Lawrence, Mattapoisett, West Greenwich, Brockton, New Bedford, Norwood, Coventry, Plymouth, Newport, Bristol, New Shoreham, Gloucester, Westerly, Cambridge, Narragansett, Fall River, Taunton, Boston, Framingham, and East Greenwich 1248 PM EDT Thu Aug 5 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of Massachusetts and Rhode Island, including the following areas, in Massachusetts, Central Middlesex MA, Eastern Essex MA, Eastern Norfolk MA, Eastern Plymouth MA, Northern Bristol MA, Southeast Middlesex MA, Southern Bristol MA, Southern Plymouth MA, Suffolk MA, Western Essex MA, Western Norfolk MA and Western Plymouth MA. In Rhode Island, Block Island RI, Bristol RI, Eastern Kent RI, Newport RI, Northwest Providence RI, Southeast Providence RI, Washington RI and Western Kent RI has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$
Nearby
Flash Flood Watches in Massachusetts, 2021Flash Flood Watches in Rhode Island, 2021Flash Flood Watches in Connecticut, 2021Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.