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Precipitation Map Legend

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?

County Boundaries

Precipitation

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)	-	-	-	-	0.07	0.17	0.26
at Simpsonville (athm2) Tabular Data (UTC) \| Tabular Data (EST)	-	-	-	-	-	-	-
Dayton (daym2) Tabular Data (UTC) \| Tabular Data (EST)	0.00	0.00	0.00	0.00	0.04	0.12	0.24
Ellicott City (elym2) Tabular Data (UTC) \| Tabular Data (EST)	-	-	0.00	0.00	0.00	0.04	0.12
Lisbon (lsbm2) Tabular Data (UTC) \| Tabular Data (EST)	-	-	-	0.00	0.04	0.20	0.28
Little Patuxent River at Centennial (ctnm2) Tabular Data (UTC) \| Tabular Data (EST)	-	-	0.00	0.00	0.04	0.04	0.24
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)	-	-	-	-	-	0.08	0.20
Unnamed Tributary at Retention Pond near Columbia Gateway (cgwm2) Tabular Data (UTC) \| Tabular Data (EST)	0.00	0.00	0.00	0.00	0.04	0.10	0.20

Area Hydrographs	River Observations Map

Resources

Hydrologic Resources

Additional Resources

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National Oceanic and Atmospheric Administration
National Weather Service
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Silver Spring, MD 20910
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