Monday deluge brought August rainfall above normal

  • Rainfall was heaviest across Baltimore County in drenching showers Monday evening.
Rainfall was heaviest across Baltimore County in drenching… (National Weather Service )
August 21, 2012|By Scott Dance

A soaking rain that passed through the region Monday evening brought August rainfall above normal, with nearly three-quarters of an inch over a period of two hours at BWI Marshall Airport.

It also drenched parts of northern Baltimore and central Baltimore County for the second time in a week. Slow-moving storms caused flash flooding Aug. 14.

The rain gauge tallied 0.71 inches at the airport from 7-9 p.m. 

Rainfall was heaviest around central and northern Baltimore County, with totals ranging from about three-quarters of an inch to more than an inch in some parts, according to the National Weather Service's Advanced Hydrologic Prediction Service models, pictured above.

Amateur weather watchers reported 1.08 inches near West Elkridge in Howard County, 1.03 inches of rain in Towson and 0.97 inches in the Hamilton area of Baltimore, according to CoCoRaHS, a network of weather spotters. Other areas measured anywhere from a quarter of an inch to half an inch.

So far this month, 2.42 inches of rain have fallen at BWI, about a quarter of an inch more than normal. Normal for the month is 3.19 inches.

Every month so far this year has seen below-normal precipitation at BWI, causing a rainfall deficit of about 8.5 inches.

Southern parts of Baltimore and Harford counties, Baltimore city and Howard County were all considered "abnormally dry" as of Aug. 14, according to the U.S. Drought Monitor. Anne Arundel County is in a moderate drought, while most of the Eastern Shore is in severe drought. 

Have a weather question? E-mail me at sdance@baltsun.com or tweet to @MdWeather.

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