FloodZoneMap.org

Home› Stories› Maryland› Coastal Flood 2021

Coastal Flood — St. Mary's, MD

Oct 28, 2021

A strong pressure gradient between low pressure over the Ohio Valley and strong high pressure over Quebec, CA resulted in a strong southeast onshore flow that brought the highest water levels to the Chesapeake Bay region and Tidal Potomac River since Tropical Storm Isabel in September 2003.

Source: NOAA National Weather Service Storm Events Database (event 990004). Narrative written by NWS staff at the time of the event.

Flood Risk Context for St. Mary's, MD

This event is one of many recorded floods in St. Mary's County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

View St. Mary's County flood data →

More Flood Stories

Tropical Storm$86.2M damage

St. Mary's, MD · Sep 18, 2003

On September 18, 2003, Hurricane Isabel made landfall on the North Carolina Coast. Its huge wind field was already piling water up into the southern Chesapeake Bay. By the time Isabel moved into central Virginia, it had weakened and was downgraded to a tropical storm.

Read the full account →
Tropical Storm1 death$750K damage

St. Mary's, MD · Aug 4, 2020

Tropical Storm Isaias moved up the east coast, passing through southern Maryland on the morning of Tuesday, August 4th, 2020, spawning several tornadoes as well as flooding rain and tropical storm force winds.

Read the full account →
Flash Flood$15K damage

St. Mary's, MD · Aug 4, 2020

Tropical Storm Isaias moved up the east coast, passing through southern Maryland on the morning of Tuesday, August 4th, 2020, spawning several tornadoes as well as flooding rain and tropical storm force winds.

Read the full account →
Tropical Storm$3.8M damage

St. Mary's, MD · Aug 27, 2011

Hurricane Irene tracked up the Mid-Atlantic Coast during the evening hours of the 27th through the early morning hours of the 28th. Irene passed by just to the east of Ocean City, Maryland during the early morning hours of the 28th.

Read the full account →