Forecast Details for Boston, MA

Recent Locations: Mahopac Falls, NY Boston, MA

Today: A chance of showers between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Otherwise, mostly sunny and hot, with a high near 92. Heat index values as high as 100. West wind 5 to 7 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 69. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Wednesday: Showers and thunderstorms likely before 11am, then a chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 76. Northeast wind 5 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers, with thunderstorms also possible after 8am. Cloudy, with a high near 74. East wind around 6 mph. Chance of precipitation is 50%.

Thursday Night: A chance of showers and thunderstorms. Cloudy, with a low around 67. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

Friday: Mostly cloudy, with a high near 79. East wind 3 to 6 mph.

Friday Night: Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.

Saturday: Partly sunny, with a high near 83. Northeast wind 3 to 7 mph.

Saturday Night: Mostly cloudy, with a low around 68. Southeast wind around 6 mph becoming calm in the evening.

Sunday: Mostly sunny, with a high near 84. Southeast wind 3 to 8 mph.

Sunday Night: Mostly cloudy, with a low around 68. South wind 3 to 6 mph.

Monday: Mostly cloudy, with a high near 84. Southeast wind 5 to 8 mph.

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Current U.S. National Radar--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 Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

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