Forecast Details for Mattapan, MA

Recent Locations: Occoquan, VA Boston, MA Mattapan, MA

Tonight: A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 2am, then a chance of showers and thunderstorms after 2am. Patchy fog. Otherwise, cloudy, with a low around 51. Northeast wind around 5 mph becoming light and variable. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers and thunderstorms before 5pm, then a slight chance of showers. Patchy fog before 10am. Otherwise, partly sunny, with a high near 70. South wind 5 to 9 mph becoming east in the afternoon. Chance of precipitation is 30%.

Thursday Night: A chance of showers and thunderstorms. Patchy fog between 2am and 3am. Otherwise, mostly cloudy, with a low around 55. Southeast wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday: A chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 73. Light and variable wind becoming northeast 5 to 8 mph in the morning. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night: A slight chance of showers before 11pm. Mostly cloudy, with a low around 48. Northeast wind 3 to 6 mph. Chance of precipitation is 20%.

Saturday: Mostly cloudy, with a high near 59. East wind 6 to 8 mph.

Saturday Night: Mostly cloudy, with a low around 48. East wind around 6 mph becoming south after midnight.

Sunday: Showers likely, mainly after noon. Cloudy, with a high near 61. South wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 60%.

Sunday Night: A chance of rain showers before 2am, then a chance of rain and snow showers between 2am and 4am, then a chance of snow showers after 4am. Mostly cloudy, with a low around 37. West wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

Monday: Mostly sunny, with a high near 49. West wind around 11 mph, with gusts as high as 21 mph.

Monday Night: Partly cloudy, with a low around 32. Northwest wind 6 to 8 mph.

Tuesday: Sunny, with a high near 54. Southwest wind 6 to 9 mph.

Tuesday Night: Partly cloudy, with a low around 42. Southwest wind around 8 mph.

Wednesday: Partly sunny, with a high near 63. West wind 7 to 10 mph.

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Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds