Forecast Details for Derry, NH

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Today: A 20 percent chance of showers before 9am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 88. South wind around 10 mph.
Tonight: A 30 percent chance of showers and thunderstorms before 7pm. Some of the storms could produce gusty winds and heavy rain. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 71. South wind 5 to 10 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday: Patchy fog before 11am. Otherwise, mostly sunny and hot, with a high near 90. West wind around 10 mph.
Sunday Night: Mostly clear, with a low around 68. West wind around 5 mph becoming calm after midnight.
Monday: Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 70%.
Monday Night: Scattered showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 50%.
Tuesday: Scattered showers. Mostly sunny, with a high near 82. Chance of precipitation is 40%.
Tuesday Night: Scattered showers before 9pm. Partly cloudy, with a low around 62. Chance of precipitation is 40%.
Wednesday: Sunny, with a high near 84.
Wednesday Night: Partly cloudy, with a low around 64.
Thursday: Scattered showers. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Thursday Night: Scattered showers. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Friday: Scattered showers. Partly sunny, with a high near 89. Chance of precipitation is 30%.

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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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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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North American Water Vapor Map

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

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