Flood Watch In NoVa, DC Due To Heavy Showers, Thunderstorms: NWS

VIRGINIA — National Weather Service issued a flood watch for Wednesday for most of the Baltimore-Washington, D.C. area, including Northern Virginia. The watch will be in effect from noon through Wednesday evening. Excessive rainfall — up to 4 inches is possible in some areas — may cause flash floods.

Scattered showers and thunderstorms are expected across the metro-D.C. region on Wednesday morning, switching over to showers and possibly a thunderstorm after 1 p.m., according to the NWS forecast. The high temperature will be near 84 degrees, with south winds of 6 to 10 mph.

"Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Low-water
crossings may be flooded," according to the NWS forecast.

As multiple rounds of heavy showers and thunderstorms pass through the Baltimore-Washington region on Wednesday, accumulations of 1 to 2 inches of rainfall are likely, according to NWS. However, amounts of 3 to 4 inches may occur in some isolated areas.

The areas where flash flooding may occur due to excessive rainfall include Washington, D.C. and the following areas in Northern Virginia: Arlington, Falls Church, Alexandria, Manassas, Manassas Park, and Fairfax, Loudoun and Prince William counties.

Scattered showers and thunderstorms will continue into Thursday morning, but switch over to a chance of showers and thunderstorms after 2 p.m. under partly sunny skies, NWS said.

A chance of rainfall will continue into Thursday evening, but the weather will begin to dry out overnight, according to NWS. Friday is expected to be sunny, with a high temperature near 82, and most of the weekend will be clear and sunny, although there is a chance of showers after 2 p.m. on Sunday.

The following is the National Weather Service's seven-day forecast for the Baltimore-D.C. region:

• Wednesday Night: Showers and possibly a thunderstorm before midnight, then scattered showers and thunderstorms, mainly between midnight and 3am. Low around 70. South wind 8 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
• Thursday: Scattered showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. West wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
• Thursday Night: A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 63. West wind around 7 mph. Chance of precipitation is 30%.
• Friday: Sunny, with a high near 82. West wind 6 to 11 mph.
• Friday Night: Mostly clear, with a low around 58.
• Saturday: Sunny, with a high near 81.
• Saturday Night: Partly cloudy, with a low around 60.
• Sunday: A chance of showers after 2pm. Mostly sunny, with a high near 82. Chance of precipitation is 40%.
• Sunday Night: A chance of showers before 2am. Partly cloudy, with a low around 59. Chance of precipitation is 30%.
• Monday: A chance of showers. Mostly sunny, with a high near 80. Chance of precipitation is 30%.
• Monday Night: A chance of showers. Partly cloudy, with a low around 61. Chance of precipitation is 30%.
• Tuesday: Mostly sunny, with a high near 80.