Forecast Details for Boston, MA

Recent Locations: Phoenix, AZ Miami, FL Boston, MA

Tonight: Increasing clouds, with a low around 12. West wind 6 to 11 mph.

Wednesday: Snow before noon, then a chance of rain between noon and 2pm. High near 40. South wind 9 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 2 inches possible.

Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 29. West wind 6 to 14 mph.

Thursday: Mostly sunny, with a high near 37. West wind around 7 mph.

Thursday Night: A chance of snow, mainly between 10pm and 2am. Partly cloudy, with a low around 21. Light west wind. Chance of precipitation is 30%. New snow accumulation of less than one inch possible.

Friday: A slight chance of snow before 10am. Mostly sunny, with a high near 37. Light and variable wind becoming southwest around 6 mph in the morning. Chance of precipitation is 20%.

Friday Night: Partly cloudy, with a low around 26. Southwest wind 3 to 5 mph.

Saturday: Mostly sunny, with a high near 44. South wind 6 to 9 mph.

Saturday Night: Partly cloudy, with a low around 29. West wind around 6 mph.

Sunday: Partly sunny, with a high near 40. Northwest wind 6 to 8 mph.

Sunday Night: Partly cloudy, with a low around 15. Northwest wind around 7 mph.

Monday: A chance of snow. Mostly sunny, with a high near 27. North wind around 8 mph. Chance of precipitation is 30%.

Monday Night: A chance of snow. Mostly cloudy, with a low around 15. Northeast wind around 6 mph. Chance of precipitation is 30%.

Tuesday: A chance of snow. Partly sunny, with a high near 32. East wind 6 to 8 mph. Chance of precipitation is 30%.

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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 Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds

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