Skip Navigation
NOAA logo - Click to go to the NOAA homepage National Weather Service Automated Flood Warning Systems NWS logo - Click to go to the NWS homepage
nav bar left
The NWS is soliciting comments on a proposal to terminate this web page. Please see the Public Notification Statement.
tab left Precipitation Map Legend tab right
Rain Gauge Rain Gauge
≥ 90% Flash Flood Guidance
≥ 70% Flash Flood Guidance
< 70% Flash Flood Guidance
Flash Flood Guidance Not Available For Location
Observation More Than 24 Hours Old
Out of Service

Last map update: 02/27/2021 at 01:30:02 pm EST
02/27/2021 18:30:02 UTC
What is UTC time?

Map Overlays

Precipitation Collapse

State of Maryland Precipitation Summary

Howard County, MD Rainfall Data (Units in Inches)
Last update: 2021-02-27 13:02:02 EST
Location Name 15 Min. 30 Min. 1 Hr. 3 Hr. 6 Hr. 12 Hr. 24 Hr.
Alpha Ridge Landfill (arlm2)
Tabular Data (UTC) | Tabular Data (EST)
at Simpsonville (athm2)
Tabular Data (UTC) | Tabular Data (EST)
Dayton (daym2)
Tabular Data (UTC) | Tabular Data (EST)
Ellicott City (elym2)
Tabular Data (UTC) | Tabular Data (EST)
Lisbon (lsbm2)
Tabular Data (UTC) | Tabular Data (EST)
Little Patuxent River at Centennial (ctnm2)
Tabular Data (UTC) | Tabular Data (EST)
Patapsco River near Elkridge below Patapsco Valley State Park (elkm2)
Tabular Data (UTC) | Tabular Data (EST)
Savage Park (svgm2)
Tabular Data (UTC) | Tabular Data (EST)
Unnamed Tributary at Retention Pond near Columbia Gateway (cgwm2)
Tabular Data (UTC) | Tabular Data (EST)
Area Hydrographs River Observations Map
Resources Collapse
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
1325 East West Highway
Silver Spring, MD 20910
Page Author: NWS Internet Services Team
Information Quality
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities