Alert archive / Massachusetts / Flash Flood Watches in 2021
Flash Flood Watch 7, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood watch at Sep 23, 2021, 2:48 PM EDT for Franklin County, Hampden County, Hampshire County, Massachusetts; Capitol Planning Region, Connecticut. It took effect at Sep 24, 2021, 12:00 AM EDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Sep 23, 2021, 2:48 PM EDT (18:48 UTC)
- In effect from
- Sep 24, 2021, 12:00 AM EDT
- Expired
- Sep 24, 2021, 9:38 AM EDT
- In force
- 10 hr
- Issued by
- NWS Boston/Norton, MA
- Flood severity
- None
Counties Capitol Planning Region, CT, Franklin County, MA, Hampden County, MA, Hampshire County, MA
The radar
The Boston radar (KBOX), 125 km from the middle of the area, began a volume at 18:48 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, 6.8 hours before the alert went out and 113 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
- -12 J/kg
- Mixed-layer LCL
- 775 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 283 m²/s²
- 0-3 km storm-relative helicity
- 308 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
811 WGUS61 KBOX 231848 FFABOX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Boston/Norton MA 248 PM EDT Thu Sep 23 2021 CTZ002-MAZ002-003-008>011-240700- /O.NEW.KBOX.FF.A.0007.210924T0400Z-210924T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Western Franklin MA-Eastern Franklin MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Including the cities of Greenfield, Northampton, Charlemont, Hartford, Amherst, Orange, Chesterfield, Windsor Locks, Springfield, and Blandford 248 PM EDT Thu Sep 23 2021 ...FLASH FLOOD WATCH IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH FRIDAY MORNING... The National Weather Service in Norton has issued a * Flash Flood Watch for portions of northern Connecticut and western Massachusetts, including the following areas, in northern Connecticut, Hartford CT. In western Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * From Midnight EDT tonight through Friday morning. * A slow moving frontal boundary will bring a period of moderate to heavy rainfall to the area. Some embedded thunderstorms are also possible. Total rainfall amounts of 1 to 3 inches are forecast, with locally higher amounts. * Heavy rainfall may cause flooding of roads and ponding of water in low lying areas, as well as isolated to scattered flash flooding. Morning commute may also be impacted. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Chai
2 follow-up statements
730 WGUS61 KBOX 240056 FFABOX Flood Watch National Weather Service Boston/Norton MA 856 PM EDT Thu Sep 23 2021 CTZ002-MAZ002-003-008>011-241600- /O.CON.KBOX.FF.A.0007.210924T0400Z-210924T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Western Franklin MA-Eastern Franklin MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Including the cities of Greenfield, Northampton, Charlemont, Hartford, Amherst, Orange, Chesterfield, Windsor Locks, Springfield, and Blandford 856 PM EDT Thu Sep 23 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH FRIDAY MORNING... The Flash Flood Watch continues for * Portions of northern Connecticut and western Massachusetts, including the following areas, in northern Connecticut, Hartford CT. In western Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA. * From Midnight EDT tonight through Friday morning. * A slow-moving front will bring a period of moderate to heavy rainfall to the area. Some embedded thunderstorms are also possible. Total rainfall amounts of 1 to 3 inches are forecast, with locally higher amounts. * Heavy rainfall may cause flooding of roads and ponding of water in low lying areas, as well as isolated to scattered flash flooding. The morning commute may also be impacted. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Belk
977 WGUS61 KBOX 241338 FFABOX Flood Watch National Weather Service Boston/Norton MA 938 AM EDT Fri Sep 24 2021 CTZ002-MAZ002-003-008>011-241445- /O.CAN.KBOX.FF.A.0007.000000T0000Z-210924T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hartford CT-Western Franklin MA-Eastern Franklin MA-Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Including the cities of Greenfield, Northampton, Charlemont, Hartford, Amherst, Orange, Chesterfield, Windsor Locks, Springfield, and Blandford 938 AM EDT Fri Sep 24 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northern Connecticut and western Massachusetts, including the following areas, in northern Connecticut, Hartford CT. In western Massachusetts, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Western Franklin MA, Western Hampden MA and Western Hampshire MA has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ KS
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 23, 9:28 AM EDT | Rip Current Statement | BOX | Barnstable, Bristol, Dukes, Essex, Nantucket, Norfolk and 2 more | 35 hr |
| Sep 23, 9:31 AM EDT | Small Craft Advisory | BOX | 30 hr |
Nearby
Flash Flood Watches in Massachusetts, 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.