Forecast Details for Westford, MA

Recent Locations: Fayetteville, NC New Haven, CT Westford, MA

Today: Sunny, with a high near 27. Wind chill values as low as -5. Northwest wind 9 to 11 mph, with gusts as high as 28 mph.

Tonight: Mostly clear, with a low around 7. Northwest wind 5 to 7 mph becoming calm after midnight.

Tuesday: A chance of snow, mainly after 2pm. Increasing clouds, with a high near 33. Calm wind becoming south around 5 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

Tuesday Night: Snow likely, mainly before 3am. Cloudy, then gradually becoming partly cloudy, with a low around 22. Light and variable wind. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.

Wednesday: A slight chance of snow after 1pm. Partly sunny, with a high near 36. Northwest wind 3 to 7 mph. Chance of precipitation is 20%.

Wednesday Night: A slight chance of snow before 10pm. Mostly cloudy, with a low around 18. Northwest wind around 6 mph. Chance of precipitation is 20%.

Thursday: Mostly sunny, with a high near 34. Northwest wind around 7 mph.

Thursday Night: Mostly clear, with a low around 13. Northwest wind around 6 mph.

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

Friday Night: Partly cloudy, with a low around 13. West wind 3 to 5 mph.

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

Saturday Night: Mostly clear, with a low around 14. Light west wind.

Sunday: Partly sunny, with a high near 36. Light and variable wind becoming east around 6 mph in the morning.

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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