Forecast Details for Westford, MA

Recent Locations: Westford, MA

Overnight: Cloudy, with a low around 40. Calm wind.

Friday: Mostly cloudy, with a high near 58. Calm wind becoming southeast 5 to 8 mph in the afternoon.

Friday Night: Showers, mainly after 3am. Patchy fog after 5am. Low around 44. South wind 5 to 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Showers, mainly before 10am. Patchy fog before 9am. High near 63. Light southwest wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday Night: Mostly clear, with a low around 37. West wind around 10 mph.

Sunday: Sunny, with a high near 60. West wind 9 to 17 mph.

Sunday Night: Mostly clear, with a low around 37. West wind 11 to 15 mph.

Monday: Sunny, with a high near 61. West wind 13 to 15 mph.

Monday Night: Mostly clear, with a low around 38. West wind around 9 mph.

Tuesday: Mostly sunny, with a high near 64. South wind 8 to 15 mph.

Tuesday Night: A chance of showers. Mostly cloudy, with a low around 45. South wind around 15 mph. Chance of precipitation is 40%.

Wednesday: Showers likely. Mostly cloudy, with a high near 59. South wind 15 to 18 mph becoming west in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 60%.

Wednesday Night: A chance of showers. Partly cloudy, with a low around 34. Northwest wind around 17 mph. Chance of precipitation is 40%.

Thursday: Sunny, with a high near 54. Northwest wind 14 to 16 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 is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds