Alert archive / Massachusetts / Flash Flood Watches in 2021
Flash Flood Watch 4, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood watch at Jul 16, 2021, 2:59 PM EDT for Providence County, Rhode Island; 4 counties in Massachusetts; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It took effect at Jul 17, 2021, 2:00 PM EDT. It was in force for 33 hr.
The area
The counties it named.
The facts
- Issued
- Jul 16, 2021, 2:59 PM EDT (18:59 UTC)
- In effect from
- Jul 17, 2021, 2:00 PM EDT
- Expired
- Jul 18, 2021, 11:00 PM EDT
- In force
- 33 hr
- Issued by
- NWS Boston/Norton, MA
- Flood severity
- None
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA, Providence County, RI
The radar
The Boston radar (KBOX), 96 km from the middle of the area, began a volume at 19:01 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
Albany, NY (KALY), launched 12:00Z, 7.0 hours before the alert went out and 142 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
- 156 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 1140 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
918 WGUS61 KBOX 161859 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 259 PM EDT Fri Jul 16 2021 CTZ002>004-MAZ002>004-008>012-170300- /O.NEW.KBOX.FF.A.0004.210717T1800Z-210718T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA- Including the cities of Milford, Fitchburg, Greenfield, Blandford, Union, Willimantic, Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, Barre, Orange, Chesterfield, Windsor Locks, Springfield, and Putnam 259 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH SATURDAY EVENING... The National Weather Service in Norton has issued a * Flash Flood Watch for portions of northern Connecticut and Massachusetts, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Northern Worcester MA, Southern Worcester MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * From Saturday afternoon through Saturday evening. * There will be a moderate risk for excessive rainfall tomorrow afternoon and evening. Scattered showers and thunderstorms will overspread the watch area Saturday afternoon and evening producing widespread rainfall amounts of 1 to 1.5 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. && $$
6 follow-up statements
717 WGUS61 KBOX 170122 FFABOX Flood Watch National Weather Service Boston/Norton MA 922 PM EDT Fri Jul 16 2021 CTZ002>004-MAZ002>004-008>012-171000- /O.CON.KBOX.FF.A.0004.210717T1800Z-210718T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA- Including the cities of Milford, Fitchburg, Greenfield, Blandford, Union, Willimantic, Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, Barre, Orange, Chesterfield, Windsor Locks, Springfield, and Putnam 922 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY AFTERNOON THROUGH SATURDAY EVENING... The Flash Flood Watch continues for * Portions of northern Connecticut and Massachusetts, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Northern Worcester MA, Southern Worcester MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * From Saturday afternoon through Saturday evening. * Showers and thunderstorms will bring rainfall amounts of 1 to 1.5 inches with locally higher amounts possible. * The ground is wet from recent rainfall and the expected heavy rainfall may cause rapid flooding of urban areas and small streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Drivers should avoid flooded roads. && $$ JWD
839 WGUS61 KBOX 170648 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 248 AM EDT Sat Jul 17 2021 CTZ002>004-MAZ002>004-008>012-172100- /O.EXT.KBOX.FF.A.0004.210717T1800Z-210718T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA- Including the cities of Milford, Fitchburg, Greenfield, Blandford, Union, Willimantic, Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, Barre, Orange, Chesterfield, Windsor Locks, Springfield, and Putnam 248 AM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH NOW IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH LATE TONIGHT... The Flash Flood Watch is now in effect for * Portions of northern Connecticut and Massachusetts, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Northern Worcester MA, Southern Worcester MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * From 2 PM EDT this afternoon through late tonight. * Showers and thunderstorms will bring rainfall amounts of 1 to 2 inches through tonight with locally higher amounts possible. * The ground remains wet from recent rainfall and the additional heavy rainfall this afternoon and tonight may cause rapid flooding of urban areas and small streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ JWD
751 WGUS61 KBOX 171956 FFABOX Flood Watch National Weather Service Boston/Norton MA 356 PM EDT Sat Jul 17 2021 CTZ002>004-MAZ002>004-008>012-181000- /O.CON.KBOX.FF.A.0004.000000T0000Z-210718T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA- Including the cities of Milford, Fitchburg, Greenfield, Blandford, Union, Willimantic, Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, Barre, Orange, Chesterfield, Windsor Locks, Springfield, and Putnam 356 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of northern Connecticut and Massachusetts, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Northern Worcester MA, Southern Worcester MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * Through late tonight. * Showers and thunderstorms will bring rainfall amounts of 1 to 3 inches through tonight with locally higher amounts possible. * The ground remains wet from recent rainfall and the additional heavy rainfall this afternoon and tonight may cause rapid flooding of urban areas and small streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ BL
666 WGUS61 KBOX 180630 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 230 AM EDT Sun Jul 18 2021 RIZ001-002-182030- /O.EXB.KBOX.FF.A.0004.000000T0000Z-210719T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northwest Providence RI-Southeast Providence RI- Including the cities of Providence, Foster, and Smithfield 230 AM EDT Sun Jul 18 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING... The National Weather Service in Norton has expanded the * Flash Flood Watch to include a portion of northern Rhode Island, including the following areas, Northwest Providence RI and Southeast Providence RI. * Through this evening. * Showers and thunderstorms on Sunday will bring rainfall amounts of 1 to 3 inches with locally higher amounts possible. * The ground remains wet from recent rainfall and the additional heavy rainfall this afternoon and tonight may cause rapid flooding of urban areas and small streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CTZ002>004-MAZ002>004-008>012-182030- /O.EXT.KBOX.FF.A.0004.000000T0000Z-210719T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA- Including the cities of Milford, Fitchburg, Greenfield, Blandford, Union, Willimantic, Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, Barre, Orange, Chesterfield, Windsor Locks, Springfield, and Putnam 230 AM EDT Sun Jul 18 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch is now in effect for * Portions of northern Connecticut and Massachusetts, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Northern Worcester MA, Southern Worcester MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * Through this evening. * Watch has been extended as another round of showers and thunderstorms will bring rainfall amounts of 1 to 3 inches this afternoon and tonight with locally higher amounts possible. * The ground remains wet from recent rainfall and the additional heavy rainfall this afternoon and tonight may cause rapid flooding of urban areas and small streams. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
094 WGUS61 KBOX 181955 FFABOX Flood Watch National Weather Service Boston/Norton MA 355 PM EDT Sun Jul 18 2021 RIZ001-002-182100- /O.CAN.KBOX.FF.A.0004.000000T0000Z-210719T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northwest Providence RI-Southeast Providence RI- Including the cities of Providence, Foster, and Smithfield 355 PM EDT Sun Jul 18 2021 ...FLASH FLOOD WATCH IS CANCELLED FOR NORTHERN RHODE ISLAND... The Flash Flood Watch for Providence County Rhode Island has been cancelled. Although showers are still possible into tonight, flash flooding is no longer expected to pose a threat. $$ CTZ002>004-MAZ002>004-008>012-190300- /O.CON.KBOX.FF.A.0004.000000T0000Z-210719T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA- Including the cities of Milford, Fitchburg, Greenfield, Blandford, Union, Willimantic, Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, Barre, Orange, Chesterfield, Windsor Locks, Springfield, and Putnam 355 PM EDT Sun Jul 18 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 PM EDT THIS EVENING... The Flash Flood Watch continues for * Portions of northern Connecticut and Massachusetts, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Northern Worcester MA, Southern Worcester MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * Until 11 PM EDT this evening. * Scattered showers and isolated thunderstorms could still produce an additional 1 to 2 inches of rain in localized areas this evening. Given the previous rain that has fallen, these amounts could be enough to trigger localized flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ GF
213 WGUS61 KBOX 190320 FFABOX Flood Watch National Weather Service Boston/Norton MA 1120 PM EDT Sun Jul 18 2021 CTZ002>004-MAZ002>004-008>012-190430- /O.EXP.KBOX.FF.A.0004.000000T0000Z-210719T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA- Including the cities of Milford, Fitchburg, Greenfield, Blandford, Union, Willimantic, Northampton, Worcester, Charlemont, Vernon, Amherst, Hartford, Barre, Orange, Chesterfield, Windsor Locks, Springfield, and Putnam 1120 PM EDT Sun Jul 18 2021 ...FLASH FLOOD WATCH HAS EXPIRED... The Flash Flood Watch for portions of northern Connecticut and Massachusetts, including the following areas, in northern Connecticut, Hartford CT, Tolland CT and Windham CT. In Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Northern Worcester MA, Southern Worcester MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA has expired. The Flood Watch is cancelled. Flooding is no longer expected to pose additional threat. Any ongoing flooding is receding. Please continue to heed remaining road closures. $$ BW
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 3:04 PM EDT | Severe Thunderstorm Warning | BOX | Providence | 56 min |
| Jul 16, 5:05 PM EDT | Severe Thunderstorm Warning | BOX | Providence | 55 min |
| Jul 16, 5:47 PM EDT | Severe Thunderstorm Warning | BOX | Providence | 33 min |
| Jul 16, 6:17 PM EDT | Special Weather Statement | BOX | Bristol, Kent, Providence | 58 min |
| Jul 16, 9:38 AM EDT | Heat Advisory | BOX | Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk | 9 hr |
| Jul 16, 3:41 PM EDT | Special Weather Statement | BOX | Hampden | 49 min |
| Jul 16, 4:26 PM EDT | Special Weather Statement | BOX | Norfolk, Suffolk | 49 min |
| Jul 16, 4:36 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 35 min |
| Jul 16, 4:50 PM EDT | Special Marine Warning | BOX | 55 min | |
| Jul 16, 6:32 PM EDT | Special Marine Warning | BOX | 43 min | |
| Jul 16, 5:14 PM EDT | Special Weather Statement | BOX | 46 min | |
| Jul 16, 5:31 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region, Northeastern Connecticut Planning Region | 42 min |
Nearby
Flash Flood Watches in Massachusetts, 2021Flash Flood Watches in Connecticut, 2021Flash Flood Watches in Rhode Island, 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.