Baltimore County, Maryland

What hazards hit Baltimore County most?

The most frequent records are severe thunderstorm wind events: 646 since 1957. 54% of its severe thunderstorm wind events since 1957 fell in June and July. The rank column places the county among Maryland's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has Baltimore County had?

NOAA records 32 tornadoes in Baltimore County from 1973 to 2025, the strongest rated F2, with 0 deaths and 67 injuries recorded in the county. That is 9th of 23 Maryland counties by days with tornadoes per 1,000 square miles since 1950. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 31 tornadoes whose track touched Baltimore County since 1950 (NOAA's county records number 32: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 2 people, 0 of them in Baltimore County.

Map of the strongest tornado tracks in Maryland.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in Baltimore County?

The most recent record with damage, injuries or deaths is the June 11, 2026 thunderstorm wind ($3,000 in damage in 2025 dollars).

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Baltimore County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

54% of its severe thunderstorm wind events since 1957 fell in June and July. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Baltimore County

FEMA's register lists 24 declarations that include Baltimore County: 17 major disasters, 7 emergencies and 0 fire management assistance declarations. Most were for snowstorm (6) and hurricane (6).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Baltimore County had?

NOAA's Storm Events Database holds 484 flood or flash flood records for Baltimore County from 1996 to 2025, on 169 days, with 2 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Baltimore County ranks 125th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $70.3 million on 3,366 claims filed in Baltimore County; the most in one year was 1,536 in 2003. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for Baltimore County

FEMA's National Risk Index rates Baltimore County Relatively Moderate overall, with an expected annual loss of $157 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with Baltimore County

1. Baltimore County 1,674
2. Harford County 1,498
3. Anne Arundel County 1,461
4. Howard County 1,172
5. Carroll County 1,149
6. York County, PA 1,102
7. Baltimore (city) 998
8. Kent County 817

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in MarylandEvery Maryland tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in MarylandThe state's severe thunderstorm wind events, by county, year and month
• The Maryland recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Baltimore CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Baltimore County's FEMA declarations (CSV)24 rows: every declaration that named the county, for your own analysis