Forecast Details for Andover, MA

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Today: Mostly cloudy, with a high near 45. North wind 6 to 9 mph.
Tonight: A chance of rain, mainly after 1am. Mostly cloudy, with a low around 36. North wind 9 to 11 mph. Chance of precipitation is 30%.
Thursday: Rain, mainly after noon. High near 46. Northwest wind 13 to 16 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night: Rain. Patchy fog after 10pm. Low around 41. Breezy, with a north wind 14 to 20 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday: Rain likely before 7am, then a chance of showers after 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 49. North wind around 14 mph. Chance of precipitation is 60%.
Friday Night: A slight chance of showers before 1am. Mostly cloudy, with a low around 35. North wind 9 to 11 mph. Chance of precipitation is 20%.
Saturday: Mostly cloudy, with a high near 47. Northeast wind 5 to 7 mph.
Saturday Night: Partly cloudy, with a low around 34. Southeast wind around 5 mph becoming calm in the evening.
Sunday: Mostly sunny, with a high near 55. Light and variable wind.
Sunday Night: Mostly cloudy, with a low around 39. South wind around 6 mph becoming west after midnight.
Monday: Partly sunny, with a high near 56. Northwest wind around 6 mph.
Monday Night: Mostly cloudy, with a low around 38. Light northwest wind.
Tuesday: Partly sunny, with a high near 57. Light and variable wind.

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Current U.S. National Radar--Current

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Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

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Tomorrows National Weather Map

North America Water Vapor (Moisture)

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North American Water Vapor Map

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