VIRGINIA — Heavy rain is bringing the risk of flooding Tuesday morning, but some areas are facing a greater threat in Northern Virginia.
A flood warning, which means flooding is imminent or already happening, has been issued for Fairfax County, City of Fairfax, City of Manassas, City of Manassas Park and Prince William County. National Weather Service forecasters said rivers, creeks, streams, and other low-lying areas are especially flood prone. Stream levels are rising due to runoff from the excess rainfall. Forecasters saw low-water crossings may not be passable because of flooding.
The warning continues through 3 p.m. Tuesday. As of 8:48 a.m., forecasters said the Doppler radar located heavy rain associated with thunderstorms. At least 0.5 to 1.5 inches have fallen, and another 0.5 to 1.5 inches are expected.
The entire Northern Virginia region and surrounding areas are under a flood watch through late Tuesday night. According to the National Weather Service, moderate to heavy showers paired with thunderstorms will linger through late Tuesday, bringing overall rainfall amounts between 2 and 4 inches.
Forecasters are monitoring the chance of flooding from excess rainfall. Creeks, streams and other low-lying and flood-prone locations are at risk of flooding. Higher localized rainfall totals are possible along the eastern slopes of the Blue Ridge and Allegheny Mountains.
Find out what's happening in Manassasfor free with the latest updates from Patch.
With flooding risks, forecasters urge drivers to "turn around, don't drown" when encountering flooded roads. The National Weather Service says 6 inches of water could knock down an adult, 12 inches of rushing water can carry away a car, and 2 feet can carry away trucks and SUVs.
The region may stay soaked for more days this week. The Washington Post's Capital Weather Gang expects light showers Wednesday morning and scattered showers and thunderstorms Wednesday afternoon and evening.
On Thursday, a chance of scattered showers and a thunderstorm in the afternoon and evening could break through partly sunny or cloudy skies.
Friday brings party sunny conditions, but forecasters can't rule out scattered afternoon and evening showers and thunderstorms. Some storms could become strong or severe. There are more chances of showers and thunderstorms Saturday before conditions clear up, and Sunday is slated to be mostly sunny.
Here's the full National Weather Service forecast based at Dulles International Airport in the coming days.
Tuesday: Showers. Patchy fog after 5 p.m. High near 68. Southeast wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100 percent. New precipitation amounts between three quarters and one inch possible. At night, showers and possibly a thunderstorm. Patchy fog between 4 a.m. and 5 a.m. Low around 62. East wind 7 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 90 percent. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday: A chance of showers, then showers and possibly a thunderstorm after 2 p.m. High near 75. New rainfall amounts between a quarter and half of an inch possible. At night, showers and possibly a thunderstorm before 11 p.m., then a chance of showers. Low around 63. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. Chance of precipitation is 80 percent.
Thursday: A chance of showers, with thunderstorms also possible after 2 p.m. Partly sunny, with a high near 80. Chance of precipitation is 40 percent. At night, a slight chance of thunderstorms before 8 p.m., then a chance of showers and thunderstorms after 2 a.m. Partly cloudy, with a low around 65. Chance of precipitation is 30 percent.
Friday: A chance of showers and thunderstorms before 8 a.m., then a chance of showers between 8 a.m. and 2 p.m., then a chance of showers and thunderstorms after 2 p.m. Partly sunny, with a high near 84. Chance of precipitation is 50 percent. At night, a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 40 percent.
Saturday: A chance of showers. Partly sunny, with a high near 84. Chance of precipitation is 50 percent. At night, mostly clear, with a low around 62.
Sunday: Mostly sunny, with a high near 82. At night, mostly clear, with a low around 58.