NWS Baltimore/Washington Hydrology Page

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 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)