Forecast Details for Chelmsford, MA

Recent Locations: Desha, AR Rockland, ME Chelmsford, MA

Tonight: A chance of showers, mainly between 2am and 5am. Patchy fog between 4am and 5am. Otherwise, increasing clouds, with a low around 63. South wind around 7 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 84. South wind 6 to 10 mph, with gusts as high as 24 mph.

Friday Night: Mostly clear, with a low around 65. South wind 6 to 9 mph.

Saturday: A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 88. South wind 7 to 11 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night: Showers and thunderstorms likely. Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 59. Southwest wind 5 to 7 mph. Chance of precipitation is 60%.

Sunday: A chance of showers, mainly before 5pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 70. Northwest wind around 5 mph. Chance of precipitation is 50%.

Sunday Night: Partly cloudy, with a low around 51. Light west wind.

Monday: Mostly sunny, with a high near 73. West wind around 6 mph.

Monday Night: Mostly clear, with a low around 46. Light northwest wind.

Tuesday: Sunny, with a high near 71. Light and variable wind becoming northeast around 5 mph in the afternoon.

Tuesday Night: Mostly clear, with a low around 46. Light and variable wind.

Wednesday: Sunny, with a high near 73. Calm wind becoming southeast around 6 mph in the afternoon.

Wednesday Night: Mostly clear, with a low around 48. Light and variable wind.

Thursday: Mostly sunny, with a high near 75. Calm wind becoming north around 6 mph in the afternoon.

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North America Water Vapor (Moisture)

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Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds