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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

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Last map update: 09/23/2018 at 04:30:02 am EDT
09/23/2018 08:30:02 UTC
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Precipitation

Howard County, MD Rainfall Data (Units in Inches)
Last update: 2018-09-22 19:09:01 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)	-	-	-	-	-	-	0.00
at Simpsonville (athm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	-	-	-	-	-	-
Ellicott City (elym2) Tabular Data (UTC) \| Tabular Data (EDT)	-	-	-	0.00	0.00	0.00	0.00
Lisbon (lsbm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	-	0.08	0.08	0.08	0.08	0.08
Little Patuxent River at Centennial (ctnm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	0.00	0.04	0.04	0.04	0.04	0.08
Patapsco River near Elkridge below Patapsco Valley State Park (elkm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	0.00	0.04	0.04	0.04	0.04	0.08
Savage Park (svgm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	-	-	0.04	0.04	0.04	0.20
Unnamed Tributary at Retention Pond near Columbia Gateway (cgwm2) Tabular Data (UTC) \| Tabular Data (EDT)	-	-	0.02	0.03	0.03	0.03	0.29

Area Hydrographs	River Observations Map

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National Weather Service
1325 East West Highway
Silver Spring, MD 20910
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