Forecast Details for Rockville, MD

Recent Locations: Manchester, NH Englewood, CO Rockville, MD

This Afternoon: Scattered showers, mainly after 5pm. Cloudy, with a high near 54. South wind around 6 mph. Chance of precipitation is 30%.

Tonight: Isolated showers before 8pm. Patchy fog after 4am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 41. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

Thursday: Rain likely, mainly after 3pm. Areas of fog before 11am. Otherwise, cloudy, with a high near 46. Light east wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night: Rain. Patchy fog. Low around 41. East wind 7 to 9 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Friday: Rain likely, mainly before 1pm. Mostly cloudy, with a high near 55. East wind 5 to 7 mph becoming southwest in the afternoon. Chance of precipitation is 70%.

Friday Night: Partly cloudy, with a low around 39.

Saturday: Partly sunny, with a high near 55.

Saturday Night: Partly cloudy, with a low around 35.

Sunday: Rain and snow likely. Mostly cloudy, with a high near 43. Chance of precipitation is 60%.

Sunday Night: A chance of snow. Mostly cloudy, with a low around 31. Chance of precipitation is 50%.

Monday: A chance of snow. Partly sunny, with a high near 40. Chance of precipitation is 30%.

Monday Night: Partly cloudy, with a low around 26.

Tuesday: Sunny, with a high near 41.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

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National Weather Forecast--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 are Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle