National Weather ServiceMassachusettsFlash Flood WarningArchive to October 1, 2026
Flash Flood Warnings in Massachusetts
The National Weather Service issued 19 flash flood warnings for Massachusetts in 2025 and 23 a year on average in 2008-2025; in 2021-2025 it had the 34th most of any state. 2026 through September: 11, 49% below the average of 22 for those months in 2008-2025. Worcester was covered most often (115 times since 2008).
How many flash flood warnings does Massachusetts get?
Every flash flood warning that covered part of Massachusetts. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 11 |
| 2025 | 19 |
| 2024 | 14 |
| 2023 | 62 |
| 2022 | 8 |
| 2021 | 35 |
| 2020 | 13 |
| 2019 | 10 |
| 2018 | 37 |
| 2017 | 32 |
| 2016 | 5 |
| 2015 | 10 |
| 2014 | 46 |
| 2013 | 44 |
| 2012 | 19 |
| 2011 | 18 |
| 2010 | 3 |
| 2009 | 17 |
| 2008 | 14 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Massachusetts get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Massachusetts?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Worcester | 115 | 30 | August 3, 2026 |
| Middlesex | 99 | 28 | August 3, 2026 |
| Hampshire | 89 | 21 | August 3, 2026 |
| Bristol | 88 | 31 | September 26, 2026 |
| Hampden | 81 | 19 | August 3, 2026 |
| Norfolk | 71 | 20 | July 10, 2025 |
| Franklin | 69 | 20 | July 29, 2026 |
| Plymouth | 60 | 21 | September 26, 2026 |
| Berkshire | 59 | 5 | July 14, 2025 |
| Essex | 50 | 13 | August 13, 2025 |
| Suffolk | 49 | 11 | July 10, 2025 |
| Barnstable | 13 | 1 | August 15, 2024 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
The latest flash flood warnings for Massachusetts in AreaZine's record
NWS Boston/NortonWarningSeptember 26, 2026
Flash Flood Warning: Bristol, Plymouth and Newport, MA and RI
Expired 6:45 p.m. EDT, September 26, 2026
NWS Boston/NortonWarningSeptember 13, 2026
Flash Flood Warning: Bristol and Plymouth, MA
Expired 2:00 p.m. EDT, September 13, 2026
NWS Boston/NortonWarningSeptember 13, 2026
Flash Flood Warning: Bristol, Bristol, Kent and 3 more, MA and RI
Expired 1:45 p.m. EDT, September 13, 2026
NWS Boston/NortonWarningAugust 3, 2026
Flash Flood Warning: Bristol, Plymouth, Bristol and 1 more, MA and RI
Expired 3:00 p.m. EDT, August 3, 2026
NWS Boston/NortonWarningAugust 3, 2026
Flash Flood Warning: Bristol, Bristol, Kent and 2 more, MA and RI
Expired 11:45 a.m. EDT, August 3, 2026
NWS Boston/NortonWarningAugust 3, 2026
Flash Flood Warning: Middlesex and Worcester, MA
Expired 10:00 a.m. EDT, August 3, 2026
NWS Boston/NortonWarningAugust 3, 2026
Flash Flood Warning: Hartford, Tolland, Hampden and 1 more, CT and MA
Expired 9:00 a.m. EDT, August 3, 2026
NWS Boston/NortonWarningJuly 29, 2026
Flash Flood Warning: Hartford, Tolland, Franklin and 3 more, CT and MA
Expired 9:00 p.m. EDT, July 29, 2026
This list is AreaZine's record of the NWS alert feed, kept since April 6, 2026; the counts above come from the complete IEM archive.
Source: National Weather Service alerts (api.weather.gov).
What is a flash flood warning?
A flash flood warning means flash flooding is happening or about to happen: water rising fast in streams, streets or dry washes, usually within six hours of heavy rain or a dam or levee failure. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. The national record · Every warning type in Massachusetts.