MD Weather: Flood Watch Issued With Heavy Rains Forecast

MARYLAND – The National Weather Service issued a flood watch for parts of Maryland until 6 am Thursday, with rainfall rates of 2 to 3 inches per hour possible in some areas.

Excessive runoff may result in the floods of rivers, creeks, streams, and other low-lying and flood-prone locations, the NWS said in an alert.

Southeastern Howard County and east-central Montgomery County are under a flood warning until 10:45 pm, the National Weather Service said.

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At 7:47 pm, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. Additional rainfall amounts of 1 to 3 inches are
possible in the warned area. Flash flooding is ongoing or expected to begin shortly, the NWS said.

Numerous showers and thunderstorms with heavy rain are expected in Baltimore-Washington, DC, region through Wednesday night and into early Thursday morning, leading to the potential for flash flooding, especially in areas that see multiple rounds of heavy rain.

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With multiple rounds of heavy rain, runoff could flood rivers, creeks, streams and other low-lying and flood-prone areas, officials say.

The flood watch went into effect at 6 pm Wednesday and continues until 6 am Thursday.

Prince George’s, Anne Arundel, Montgomery, Howard, Harford, Baltimore, Cecil and Carroll counties.

Cities in the watch include Baltimore, Silver Spring, Bowie, Annapolis, Odenton, Bethesda, College Park, Columbia, Severna Park, Greenbelt, Germantown, Rockville, Frederick, Hagerstown, Suitland-Silver Hill, Arnold, Gaithersburg, Severn, Glen Burnie, Ellicott City, and Laurel.

During the flood watch period, the National Weather Service said.

There is also an “isolated threat” for flooding and severe weather on Saturday, according to a hazardous weather outlook issued by the weather service.

A few of the storms may be severe, “unleashing damaging wind gusts and hail,” The Washington Post’s Capital Weather Gang said Wednesday afternoon.

Multiple waves of downpours are possible, with the first coming at 10 pm and at least one or two more rounds, according to the Capital Weather Gang.

“Rainfall totals may average just 0.5 to 1 inch, but could reach 2 to 3 inches in small areas, falling over a short duration,” the forecasters said.

Here’s the latest Maryland forecast:

Wednesday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rain. Low around 68. Southeast wind 5 to 9 mph becoming northeast in the evening. Chance of precipitation is 90%. New rainfall between a half and three quarters of an inch possible.

Thursday: Showers and thunderstorms likely before noon, then a slight chance of showers between noon and 3pm. Cloudy through mid morning, then gradual clearing, with a high near 83. Southwest wind 9 to 17 mph becoming west in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and a quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night: Mostly clear, with a low around 60. Northwest wind 5 to 10 mph becoming light after midnight.

Friday: Mostly sunny, with a high near 83. Light northwest wind becoming 5 to 9 mph in the morning.

Friday Night: Showers likely, mainly after 3am. Mostly cloudy, with a low around 63. South wind around 5 mph becoming light and variable. Chance of precipitation is 60%.

Saturday: Showers likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.

Saturday Night: A chance of showers before 9pm. Mostly cloudy, with a low around 60. Chance of precipitation is 50%.

Sunday: Partly sunny, with a high near 82.

Sunday Night: Partly cloudy, with a low around 65.

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