Ian to Bring Life-Threatening Storm Surge and Hurricane Conditions By This Afternoon

The center of Ian will reach the coast of South Carolina today, and then move farther inland across eastern South Carolina and central North Carolina tonight and Saturday. There is a danger of life-threatening storm surge along the coasts of northeast Florida, Georgia, and the Carolinas today. Hurricane-force winds are expected along the coasts of South Carolina and southeastern North Carolina. Read More >

LOADING...

Baltimore/Washington Area Hydrology Page

What's NEW?
View our timeline of historic flood events in the region!
Check out the DC-area Potomac Inundation Maps!
Latest drought information

Click on a tab below to view associated information!

River Observations

River Forecasts

Temp/Precip Data

Precip Forecasts

Flood Awareness

Other Information

River Observations
Hover over a location to see its name. Click on any point to see information for that site.

Text version for key sites (updated every 6 hours)

River Forecasts

Hover over a location to see its name. Click on any point to see information for that site.
Scroll below the map to see major rivers at a glance.

Text forecast for key sites (updated daily each morning)

If the map below does not load, click the button next to "River Forecasts."

Temperature/Precipitation Observations

Daily Roundup (issued 10am daily)
Daily Automated Station Data (issued twice daily)
Current Conditions (updated hourly)
Precipitation Last 72 Hours
AFWS Data from MD/VA/WV
IFLOWS Data from Virginia

Local Precipitation Forecasts
(Hover over or click/tap on the timeframes to change the image.)

QPF

National Precipitation Forecasts, Days 1 through 3 (click to enlarge) Please note: The below forecasts represent a basin average and may not represent local maxima. Images from the NWS Weather Prediction Center (WPC)
Day 1 Rainfall	Day 2 Rainfall	Day 3 Rainfall
Days 4-7 Forecast Rainfall (NWS Weather Prediction Center) 7 Day Total Forecast Rainfall (NWS Weather Prediction Center) Probabilistic Rainfall (NWS Weather Prediction Center)