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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: 08/13/2020 at 08:00:04 am EDT
08/13/2020 12:00:04 UTC
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County Boundaries

Precipitation

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)	-	0.01	0.02	0.02	0.02	0.08	0.76
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)	-	0.00	0.00	0.00	0.00	0.04	2.64
Lisbon (lsbm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	0.08	0.08	0.12	0.12	0.16	2.16
Little Patuxent River at Centennial (ctnm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	-	-	0.00	0.00	0.04	1.00
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)	-	-	-	-	-	0.08	0.68
Unnamed Tributary at Retention Pond near Columbia Gateway (cgwm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	-	0.00	0.00	0.00	0.00	0.01

Area Hydrographs	River Observations Map

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Additional Resources

US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
1325 East West Highway
Silver Spring, MD 20910
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