Forecast Details for Merrifield, VA

Recent Locations: Merrifield, VA  
Today: Rain before 2pm, then showers likely, mainly between 2pm and 3pm. High near 68. South wind 6 to 8 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Tonight: A chance of showers, mainly before 1am. Patchy fog. Otherwise, cloudy, with a low around 63. Southeast wind 5 to 7 mph. Chance of precipitation is 40%.
Monday: A chance of showers and thunderstorms after 2pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 80. West wind around 5 mph. Chance of precipitation is 40%.
Monday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 63. Light and variable wind becoming northwest around 5 mph. Chance of precipitation is 50%.
Tuesday: A slight chance of thunderstorms before 8am, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 80. Light and variable wind becoming southeast around 6 mph in the morning. Chance of precipitation is 50%.
Tuesday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Wednesday: A chance of showers after 2pm. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Wednesday Night: A chance of showers, with thunderstorms also possible after 8pm. Mostly cloudy, with a low around 65. Chance of precipitation is 50%.
Thursday: A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 78. Chance of precipitation is 80%.
Thursday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 60. Chance of precipitation is 80%.
Friday: A chance of showers. Mostly sunny, with a high near 74. Chance of precipitation is 50%.
Friday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 54. Chance of precipitation is 40%.
Saturday: A chance of showers. Mostly sunny, with a high near 67. Chance of precipitation is 40%.

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Current U.S. National Radar--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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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

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet