Forecast Details for Ashburn, VA

Recent Locations: Ashburn, VA  
This Afternoon: Scattered showers. Cloudy, with a high near 70. East wind 7 to 9 mph. Chance of precipitation is 30%.
Tonight: A chance of showers and thunderstorms before 7pm, then showers likely and possibly a thunderstorm between 7pm and 10pm, then a chance of showers and thunderstorms after 10pm. Cloudy, with a low around 56. East wind 6 to 9 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday: Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 60. Northeast wind 6 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 49. North wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday: A slight chance of showers before 8am, then a chance of showers after 2pm. Partly sunny, with a high near 65. Light and variable wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 50%.
Saturday Night: Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 50. Chance of precipitation is 60%.
Sunday: A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 66. Chance of precipitation is 40%.
Sunday Night: A chance of thunderstorms before 8pm. Mostly clear, with a low around 47. Chance of precipitation is 30%.
Monday: Mostly sunny, with a high near 74.
Monday Night: Partly cloudy, with a low around 56.
Tuesday: A chance of showers. Partly sunny, with a high near 76. Chance of precipitation is 30%.
Tuesday Night: Showers likely. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Wednesday: Showers likely. Mostly cloudy, with a high near 74. Chance of precipitation is 60%.

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North America Water Vapor (Moisture)

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Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Precipitation Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain