Skip Navigation Linkweather.gov
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
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: 08/13/2020 at 08:00:04 am EDT
08/13/2020 12:00:04 UTC
What is UTC time?

Map Overlays

Precipitation Collapse

State of Maryland Precipitation Summary

Howard County, MD Rainfall Data (Units in Inches)
Last update: 2020-08-13 8:08:04 EDT
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 (EDT)
-0.010.020.020.020.080.76
at Simpsonville (athm2)
Tabular Data (UTC) | Tabular Data (EDT)
-------
Dayton (daym2)
Tabular Data (UTC) | Tabular Data (EDT)
-------
Ellicott City (elym2)
Tabular Data (UTC) | Tabular Data (EDT)
-0.000.000.000.000.042.64
Lisbon (lsbm2)
Tabular Data (UTC) | Tabular Data (EDT)
-0.080.080.120.120.162.16
Little Patuxent River at Centennial (ctnm2)
Tabular Data (UTC) | Tabular Data (EDT)
---0.000.000.041.00
Patapsco River near Elkridge below Patapsco Valley State Park (elkm2)
Tabular Data (UTC) | Tabular Data (EDT)
-------
Savage Park (svgm2)
Tabular Data (UTC) | Tabular Data (EDT)
-----0.080.68
Unnamed Tributary at Retention Pond near Columbia Gateway (cgwm2)
Tabular Data (UTC) | Tabular Data (EDT)
--0.000.000.000.000.01
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
Disclaimer
Information Quality
Credits
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities