Forecast Details for Westford, MA

Recent Locations: Round Rock, TX Omaha, NE Westford, MA

Today: Mostly sunny, with a high near 38. West wind 8 to 11 mph, with gusts as high as 22 mph.

Tonight: Partly cloudy, with a low around 21. Northwest wind 7 to 9 mph.

Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 34. Northwest wind 10 to 13 mph, with gusts as high as 24 mph.

Thursday Night: Mostly clear, with a low around 12. Northwest wind 6 to 8 mph.

Friday: Sunny, with a high near 36. West wind around 7 mph.

Friday Night: A slight chance of snow after midnight. Mostly cloudy, with a low around 18. West wind around 6 mph. Chance of precipitation is 20%.

Saturday: Mostly sunny, with a high near 37. Northwest wind 6 to 8 mph.

Saturday Night: Mostly clear, with a low around 15. Northwest wind around 6 mph.

Sunday: Sunny, with a high near 37. Light and variable wind becoming northwest around 5 mph.

Sunday Night: Mostly cloudy, with a low around 21. Light southwest wind.

Washington's Birthday: Mostly cloudy, with a high near 40. West wind 5 to 7 mph.

Monday Night: Partly cloudy, with a low around 25. West wind around 6 mph.

Tuesday: Sunny, with a high near 43. Northwest wind around 6 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)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds