National Weather ServiceMarylandFlood WarningArchive to October 1, 2026
Flood Warnings in Maryland
The National Weather Service issued 54 flood warnings for Maryland in 2025 and 74 a year on average in 2008-2025; in 2021-2025 it had the 28th most of any state. 2026 through September: 10, 84% below the average of 63 for those months in 2008-2025. Montgomery was covered most often (278 times since 2008).
How many flood warnings does Maryland get?
Every flood warning that covered part of Maryland. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 10 |
| 2025 | 54 |
| 2024 | 59 |
| 2023 | 30 |
| 2022 | 79 |
| 2021 | 114 |
| 2020 | 128 |
| 2019 | 69 |
| 2018 | 301 |
| 2017 | 47 |
| 2016 | 64 |
| 2015 | 31 |
| 2014 | 48 |
| 2013 | 34 |
| 2012 | 44 |
| 2011 | 100 |
| 2010 | 54 |
| 2009 | 27 |
| 2008 | 40 |
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 Maryland 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 Maryland?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Montgomery | 278 | 26 | July 7, 2026 |
| Baltimore | 233 | 31 | July 28, 2026 |
| Prince Georges | 214 | 14 | July 20, 2025 |
| Frederick | 187 | 10 | July 9, 2026 |
| Anne Arundel | 154 | 20 | July 28, 2026 |
| Washington | 151 | 19 | August 16, 2025 |
| Howard | 151 | 18 | July 22, 2026 |
| Harford | 128 | 17 | July 31, 2025 |
| Baltimore City | 128 | 16 | July 28, 2026 |
| Carroll | 111 | 7 | August 9, 2024 |
| Allegany | 110 | 19 | May 27, 2026 |
| St. Marys | 84 | 6 | January 10, 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 flood warnings for Maryland in AreaZine's record
NWS Baltimore MD/WashingtonWarningAugust 11, 2026
Flood Warning: Garrett, MD
Expired 8:00 a.m. EDT, August 11, 2026
NWS Baltimore MD/WashingtonWarningJuly 28, 2026
Flood Warning: Anne Arundel, Baltimore and Baltimore City, MD
Expired 8:15 p.m. EDT, July 28, 2026
NWS Baltimore MD/WashingtonWarningJuly 22, 2026
Flood Warning: Anne Arundel and Howard, MD
Expired 6:30 a.m. EDT, July 22, 2026
NWS Baltimore MD/WashingtonWarningJuly 9, 2026
Flood Warning: Baltimore and Baltimore City, MD
Expired 8:00 p.m. EDT, July 9, 2026
NWS Baltimore MD/WashingtonWarningJuly 9, 2026
Flood Warning: Frederick, MD
Expired 5:00 p.m. EDT, July 9, 2026
NWS Baltimore MD/WashingtonWarningJuly 6, 2026
Flood Warning: Montgomery, MD
Expired 1:45 a.m. EDT, July 7, 2026
NWS Baltimore MD/WashingtonWarningJuly 6, 2026
Flood Warning: Baltimore and Baltimore City, MD
Expired 10:30 p.m. EDT, July 6, 2026
NWS Baltimore MD/WashingtonWarningMay 27, 2026
Flood Warning: Allegany, MD
Expired 3:00 p.m. EDT, May 27, 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 flood warning?
A flood warning means flooding is happening or about to happen. The NWS issues it both for rivers at forecast points (river flood warnings) and for areas where water ponds or runs off (areal flood warnings); AreaZine counts both. 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 Maryland.