Alert archive / Massachusetts / Flash Flood Watches in 2021
Flash Flood Watch 3, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood watch at Jul 11, 2021, 3:34 PM EDT for 5 counties in Rhode Island; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; 10 counties in Massachusetts. It took effect at Jul 11, 2021, 8:00 PM EDT. It was in force for 17 hr.
The area
The counties it named.
The facts
- Issued
- Jul 11, 2021, 3:34 PM EDT (19:34 UTC)
- In effect from
- Jul 11, 2021, 8:00 PM EDT
- Expired
- Jul 12, 2021, 1:00 PM EDT
- In force
- 17 hr
- Issued by
- NWS Boston/Norton, MA
- Flood severity
- None
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Bristol County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire 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), 43 km from the middle of the area, began a volume at 19:35 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 12:00Z, 7.6 hours before the alert went out and 165 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
- 17 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 715 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
828 WGUS61 KBOX 111934 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 334 PM EDT Sun Jul 11 2021 MAZ002>016-026-120930- /O.NEW.KBOX.FF.A.0003.210712T0000Z-210713T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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 Middlesex MA- Including the cities of Quincy, Foxborough, Barre, Ayer, Orange, Springfield, Lowell, Milford, Lawrence, Charlemont, Gloucester, Norwood, Chesterfield, Fitchburg, Blandford, Cambridge, Greenfield, Boston, Northampton, Worcester, Amherst, and Framingham 334 PM EDT Sun Jul 11 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH MONDAY EVENING... The National Weather Service in Norton has issued a * Flash Flood Watch for portions of central Massachusetts, eastern Massachusetts, northeastern Massachusetts and western Massachusetts, including the following areas, in central Massachusetts, Northern Worcester MA and Southern Worcester MA. In eastern Massachusetts, Central Middlesex MA, Eastern Norfolk MA, Northern Middlesex MA, Southeast Middlesex MA, Suffolk MA and Western Norfolk MA. In northeastern Massachusetts, Eastern Essex MA and Western Essex MA. In western Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * From 8 PM EDT this evening through Monday evening. * Showers will overspread the watch area tonight with the rain coming down heavy at times. Total rainfall is expected to range from 1 to 2 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Chai
4 follow-up statements
495 WGUS61 KBOX 111950 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 350 PM EDT Sun Jul 11 2021 CTZ002>004-MAZ017>019-RIZ001>004-120930- /O.EXB.KBOX.FF.A.0003.210712T1600Z-210713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-Northwest Providence RI-Southeast Providence RI-Western Kent RI-Eastern Kent RI- Including the cities of Coventry, Providence, Union, Willimantic, Warwick, Plymouth, West Warwick, Taunton, Vernon, Foster, Hartford, West Greenwich, East Greenwich, Windsor Locks, Brockton, Smithfield, and Putnam 350 PM EDT Sun Jul 11 2021 ...FLASH FLOOD WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... The National Weather Service in Norton has expanded the * Flash Flood Watch to include portions of northern Connecticut, southeastern Massachusetts and northern Rhode Island, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In southeastern Massachusetts, Eastern Plymouth MA, Northern Bristol MA and Western Plymouth MA. In northern Rhode Island, Eastern Kent RI, Northwest Providence RI, Southeast Providence RI and Western Kent RI. * From Monday afternoon through Tuesday morning. * Scattered showers and thunderstorms will overspread the watch area Monday afternoon into evening with the rain coming down heavy at times. Total rainfall is expected to range from 0.5 to 1.25 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ MAZ002>016-026-120930- /O.CON.KBOX.FF.A.0003.210712T0000Z-210713T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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 Middlesex MA- Including the cities of Quincy, Foxborough, Barre, Ayer, Orange, Springfield, Lowell, Milford, Lawrence, Charlemont, Gloucester, Norwood, Chesterfield, Fitchburg, Blandford, Cambridge, Greenfield, Boston, Northampton, Worcester, Amherst, and Framingham 350 PM EDT Sun Jul 11 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH MONDAY EVENING... The Flash Flood Watch continues for * Portions of central Massachusetts, eastern Massachusetts, northeastern Massachusetts and western Massachusetts, including the following areas, in central Massachusetts, Northern Worcester MA and Southern Worcester MA. In eastern Massachusetts, Central Middlesex MA, Eastern Norfolk MA, Northern Middlesex MA, Southeast Middlesex MA, Suffolk MA and Western Norfolk MA. In northeastern Massachusetts, Eastern Essex MA and Western Essex MA. In western Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * From 8 PM EDT this evening through Monday evening. * Showers will overspread the watch area tonight with the rain coming down heavy at times. Total rainfall is expected to range from 1 to 2 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Chai
624 WGUS61 KBOX 112124 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 524 PM EDT Sun Jul 11 2021 MAZ020-021-RIZ005>008-120530- /O.EXA.KBOX.FF.A.0003.210712T1600Z-210713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southern Bristol MA-Southern Plymouth MA-Bristol RI-Washington RI- Newport RI-Block Island RI- Including the cities of Westerly, New Bedford, Narragansett, Fall River, New Shoreham, Newport, Bristol, and Mattapoisett 524 PM EDT Sun Jul 11 2021 ...FLASH FLOOD WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... The National Weather Service in Norton has expanded the * Flash Flood Watch to include portions of southeastern Massachusetts and Rhode Island, including the following areas, in southeastern Massachusetts, Southern Bristol MA and Southern Plymouth MA. In Rhode Island, Block Island RI, Bristol RI, Newport RI and Washington RI. * From Monday afternoon through Tuesday morning. * Scattered showers and thunderstorms will overspread the watch area Monday afternoon into evening with the rain coming down heavy at times. Total rainfall is expected to range from 0.5 to 1.25 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ MAZ002>016-026-120530- /O.CON.KBOX.FF.A.0003.210712T0000Z-210713T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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 Middlesex MA- Including the cities of Quincy, Foxborough, Barre, Ayer, Orange, Springfield, Lowell, Milford, Lawrence, Charlemont, Gloucester, Norwood, Chesterfield, Fitchburg, Blandford, Cambridge, Greenfield, Boston, Northampton, Worcester, Amherst, and Framingham 524 PM EDT Sun Jul 11 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH MONDAY EVENING... The Flash Flood Watch continues for * Portions of central Massachusetts, eastern Massachusetts, northeastern Massachusetts and western Massachusetts, including the following areas, in central Massachusetts, Northern Worcester MA and Southern Worcester MA. In eastern Massachusetts, Central Middlesex MA, Eastern Norfolk MA, Northern Middlesex MA, Southeast Middlesex MA, Suffolk MA and Western Norfolk MA. In northeastern Massachusetts, Eastern Essex MA and Western Essex MA. In western Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * Through Monday evening. * Showers will overspread the watch area tonight with the rain coming down heavy at times. Total rainfall is expected to range from 1 to 2 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CTZ002>004-MAZ017>019-RIZ001>004-120530- /O.CON.KBOX.FF.A.0003.210712T1600Z-210713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-Northwest Providence RI-Southeast Providence RI-Western Kent RI-Eastern Kent RI- Including the cities of Coventry, Providence, Union, Willimantic, Warwick, Plymouth, West Warwick, Taunton, Vernon, Foster, Hartford, West Greenwich, East Greenwich, Windsor Locks, Brockton, Smithfield, and Putnam 524 PM EDT Sun Jul 11 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY MORNING... The Flash Flood Watch continues for * Portions of northern Connecticut, southeastern Massachusetts and northern Rhode Island, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In southeastern Massachusetts, Eastern Plymouth MA, Northern Bristol MA and Western Plymouth MA. In northern Rhode Island, Eastern Kent RI, Northwest Providence RI, Southeast Providence RI and Western Kent RI. * From Monday afternoon through Tuesday morning. * Scattered showers and thunderstorms will overspread the watch area Monday afternoon into evening with the rain coming down heavy at times. Total rainfall is expected to range from 0.5 to 1.25 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Chai
548 WGUS61 KBOX 120444 FFABOX Flood Watch National Weather Service Boston/Norton MA 1244 AM EDT Mon Jul 12 2021 MAZ002>016-026-122100- /O.CON.KBOX.FF.A.0003.000000T0000Z-210713T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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 Middlesex MA- Including the cities of Quincy, Foxborough, Barre, Ayer, Orange, Springfield, Lowell, Milford, Lawrence, Charlemont, Gloucester, Norwood, Chesterfield, Fitchburg, Blandford, Cambridge, Greenfield, Boston, Northampton, Worcester, Amherst, and Framingham 1244 AM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * Portions of central Massachusetts, eastern Massachusetts, northeastern Massachusetts and western Massachusetts, including the following areas, in central Massachusetts, Northern Worcester MA and Southern Worcester MA. In eastern Massachusetts, Central Middlesex MA, Eastern Norfolk MA, Northern Middlesex MA, Southeast Middlesex MA, Suffolk MA and Western Norfolk MA. In northeastern Massachusetts, Eastern Essex MA and Western Essex MA. In western Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * Through this evening. * Showers will overspread the watch area this morning with the rain coming down heavy at times. Total rainfall is expected to range from 1 to 2 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CTZ002>004-MAZ017>019-RIZ001>004-122100- /O.CON.KBOX.FF.A.0003.210712T1600Z-210713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-Northwest Providence RI-Southeast Providence RI-Western Kent RI-Eastern Kent RI- Including the cities of Coventry, Providence, Union, Willimantic, Warwick, Plymouth, West Warwick, Taunton, Vernon, Foster, Hartford, West Greenwich, East Greenwich, Windsor Locks, Brockton, Smithfield, and Putnam 1244 AM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM NOON EDT TODAY THROUGH TUESDAY MORNING... The Flash Flood Watch continues for * Portions of northern Connecticut, southeastern Massachusetts and northern Rhode Island, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In southeastern Massachusetts, Eastern Plymouth MA, Northern Bristol MA and Western Plymouth MA. In northern Rhode Island, Eastern Kent RI, Northwest Providence RI, Southeast Providence RI and Western Kent RI. * From Noon EDT today through Tuesday morning. * Scattered showers and thunderstorms will overspread the watch area this afternoon into the evening with the rain coming down heavy at times. Total rainfall is expected to range from 0.5 to 1.25 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ MAZ020-021-RIZ005>008-122100- /O.CON.KBOX.FF.A.0003.210712T1600Z-210713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southern Bristol MA-Southern Plymouth MA-Bristol RI-Washington RI- Newport RI-Block Island RI- Including the cities of Westerly, New Bedford, Narragansett, Fall River, New Shoreham, Newport, Bristol, and Mattapoisett 1244 AM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM NOON EDT TODAY THROUGH TUESDAY MORNING... The Flash Flood Watch continues for * Portions of southeastern Massachusetts and Rhode Island, including the following areas, in southeastern Massachusetts, Southern Bristol MA and Southern Plymouth MA. In Rhode Island, Block Island RI, Bristol RI, Newport RI and Washington RI. * From Noon EDT today through Tuesday morning. * Scattered showers and thunderstorms will overspread the watch area this afternoon into the evening with the rain coming down heavy at times. Total rainfall is expected to range from 0.5 to 1.25 inches, with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause localized flash flooding especially in urban and poor drainage areas. Some smaller streams may quickly rise out of their banks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ BL
540 WGUS61 KBOX 121700 FFABOX Flood Watch National Weather Service Boston/Norton MA 100 PM EDT Mon Jul 12 2021 CTZ002>004-MAZ017>021-RIZ001>008-121800- /O.CAN.KBOX.FF.A.0003.000000T0000Z-210713T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA-Northwest Providence RI-Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-Washington RI-Newport RI-Block Island RI- Including the cities of Union, West Warwick, Providence, Foster, Warwick, Windsor Locks, Smithfield, Putnam, Mattapoisett, Vernon, Hartford, West Greenwich, Brockton, New Bedford, Coventry, Willimantic, Plymouth, Newport, Bristol, New Shoreham, Westerly, Narragansett, Fall River, Taunton, and East Greenwich 100 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northern Connecticut, southeastern Massachusetts and Rhode Island has been cancelled. Heavy rainfall previously forecast to occur later today and overnight is no longer expected. Thus the potential for flooding has greatly diminished. $$ MAZ002>016-026-121800- /O.CAN.KBOX.FF.A.0003.000000T0000Z-210713T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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 Middlesex MA- Including the cities of Quincy, Foxborough, Barre, Ayer, Orange, Springfield, Lowell, Milford, Lawrence, Charlemont, Gloucester, Norwood, Chesterfield, Fitchburg, Blandford, Cambridge, Greenfield, Boston, Northampton, Worcester, Amherst, and Framingham 100 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for western, central and northeastern Massachusetts has been cancelled. The heavy rainfall from earlier today has ended. No additional flooding is expected this afternoon. $$ Nash
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.