Forecast Details for Lancaster, MA

Recent Locations: Cable, WI Olney, IL Lancaster, MA

Today: Mostly sunny, with a high near 59. North wind 6 to 10 mph becoming east in the afternoon. Winds could gust as high as 21 mph.

Tonight: A chance of showers, mainly after 1am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 37. East wind 3 to 7 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Sunday: Showers. Patchy fog before 3pm. High near 61. Light and variable wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Sunday Night: Cloudy during the early evening, then gradual clearing, with a low around 35. West wind around 7 mph.

Monday: Mostly sunny, with a high near 51. West wind 8 to 11 mph, with gusts as high as 22 mph.

Monday Night: A slight chance of showers between midnight and 2am. Partly cloudy, with a low around 31. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

Tuesday: A chance of snow showers before 10am, then a chance of rain and snow showers between 10am and 11am, then a chance of rain showers after 11am. Partly sunny, with a high near 48. Calm wind becoming west 5 to 8 mph in the morning. Chance of precipitation is 50%.

Tuesday Night: Mostly clear, with a low around 23. Northwest wind 3 to 5 mph.

Wednesday: Sunny, with a high near 50. Calm wind becoming southwest around 5 mph in the afternoon.

Wednesday Night: Mostly clear, with a low around 30. South wind around 5 mph.

Thursday: Sunny, with a high near 61. South wind 5 to 11 mph, with gusts as high as 21 mph.

Thursday Night: Partly cloudy, with a low around 40. South wind around 7 mph.

Friday: Mostly sunny, with a high near 65. West wind 5 to 8 mph.

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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