Forecast Details for Grantham, NH

Recent Locations: Erwin, TN Shacklefords, VA Grantham, NH

Tonight: Showers and thunderstorms before 4am, then a chance of showers. Areas of fog after 4am. Low around 58. South wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: Areas of fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 78. South wind 5 to 15 mph, with gusts as high as 25 mph.

Friday Night: Partly cloudy, with a low around 63. South wind around 5 mph.

Saturday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 79. South wind 5 to 10 mph. Chance of precipitation is 70%.

Saturday Night: Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 54. West wind around 5 mph. Chance of precipitation is 80%.

Sunday: A 30 percent chance of showers before 10am. Partly sunny, with a high near 69.

Sunday Night: Partly cloudy, with a low around 47.

Monday: Sunny, with a high near 67.

Monday Night: Mostly clear, with a low around 44.

Tuesday: Sunny, with a high near 68.

Tuesday Night: Mostly clear, with a low around 43.

Wednesday: Sunny, with a high near 71.

Wednesday Night: Partly cloudy, with a low around 46.

Thursday: Mostly sunny, with a high near 71.

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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 Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds