More Strong Thunderstorms, Heat Loom In VA Forecast

High heat, soaring humidity and more thunderstorms are in the forecast for an already soggy Northern Virginia this week.

Heavy rains Monday night caused street flooding in parts of the DC region. In Fairfax County, flash flooding covered U.S. Route 50 between Prosperity Avenue and Cedar Lane and part of Arlington Boulevard, according to WTOP. For a time, water covered all westbound lanes of the Dulles Toll Road west of the Capital Beltway.

Water rescues were reported in the Tysons area, WTOP said, while the station's Kyle Cooper reported from Vienna, where Old Courthouse Road had completely flooded. “This is a roadway, but it looks like a river," Cooper said. "The water is unbelievably high.”

The National Weather Service has issued a hazardous weather outlook for Northern Virginia due to scattered instances of flash flooding possible Tuesday afternoon. The outlook includes the District of Columbia, Fairfax, Arlington, Falls Church, Alexandria, Stafford, Spotsylvania, Prince William, Manassas and Manassas Park.

"Most of the D.C. area may get a welcome break from storms today," said The Washington Post's Capital Weather Gang. "I write 'may' because it’s so humid outside that some hit-or-miss downpours still could flare up. But computer models don’t project that they will be widespread. The chance of showers and storms is much higher in central and southern Virginia, where a flood watch is in effect."

Heat index values of up to 100 degrees are expected by Thursday, according to the National Weather Service. It advises residents to limit outdoor activities during the middle of the day, drink plenty of fluids, and stay in air conditioning when possible.

Thursday will be the hottest day of the week with high temperatures climbing into the low-90s, the Post said. When the heat is combined with the high levels of humidity, the heat index values will climb to about 100 degrees.

Here is the forecast for the DC region from the National Weather Service:

Tuesday: A chance of showers and thunderstorms, mainly after 2pm. Partly sunny, with a high near 89. Light and variable wind becoming north around 5 mph. Chance of precipitation is 40%.

Tuesday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Partly cloudy, with a low around 73. South wind 3 to 5 mph. Chance of precipitation is 30%.

Wednesday: A chance of showers, then showers and thunderstorms likely after 11am. Partly sunny, with a high near 90. Heat index values as high as 100. South wind 6 to 10 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 75. South wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Southwest wind around 9 mph. Chance of precipitation is 40%.

Thursday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 30%.

Friday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 89. Chance of precipitation is 60%.

Friday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 60%.

Saturday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 40%.

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