Forecast Details for Boston, MA

Recent Locations: Anchorage, AK Baltimore, MD Boston, MA

Tonight: Mostly cloudy, with a low around 12. Calm wind becoming northwest around 5 mph after midnight.

Friday: Mostly cloudy, with a high near 28. North wind 3 to 6 mph.

Friday Night: A chance of snow, mainly after 1am. Patchy fog after 5am. Otherwise, cloudy, with a low around 21. Calm wind. Chance of precipitation is 40%. Little or no snow accumulation expected.

Saturday: Snow. Patchy fog before 8am. High near 28. Light north wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

Saturday Night: A chance of snow, mainly before 11pm. Mostly cloudy, with a low around 3. Northwest wind around 14 mph, with gusts as high as 29 mph. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.

Sunday: Mostly sunny, with a high near 16. Northwest wind 11 to 14 mph, with gusts as high as 25 mph.

Sunday Night: Partly cloudy, with a low around 2. Northwest wind 8 to 10 mph, with gusts as high as 24 mph.

Monday: Sunny, with a high near 21. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.

Monday Night: Mostly clear, with a low around 6. Northwest wind around 7 mph.

Tuesday: Mostly sunny, with a high near 30. Northwest wind around 7 mph.

Tuesday Night: Partly cloudy, with a low around 12. West wind 3 to 5 mph.

Wednesday: Mostly sunny, with a high near 34. Northwest wind around 6 mph.

Wednesday Night: A chance of snow. Partly cloudy, with a low around 23. North wind around 6 mph becoming west in the evening. Chance of precipitation is 30%.

Thursday: Mostly sunny, with a high near 36. Northwest wind around 7 mph.

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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