Forecast Details for Nantucket, MA

Recent Locations: Nantucket, MA

Current Alerts for Nantucket, MA: Coastal Flood Advisory High Surf Advisory

Overnight: Showers. Areas of fog. Low around 61. Windy, with a northeast wind 26 to 28 mph, with gusts as high as 41 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Saturday: Showers. Areas of fog. High near 66. Breezy, with a northeast wind 23 to 25 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

Saturday Night: A chance of showers, mainly before 3am. The rain could be heavy at times. Patchy fog before midnight. Otherwise, cloudy, with a low around 61. Breezy, with a northeast wind 18 to 21 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Sunday: A slight chance of showers between 9am and 3pm. Mostly cloudy, with a high near 65. Breezy, with a northeast wind 18 to 20 mph. Chance of precipitation is 20%.

Sunday Night: Partly cloudy, with a low around 56. Northeast wind around 15 mph.

Monday: Mostly sunny, with a high near 65. Northeast wind around 15 mph.

Monday Night: Mostly cloudy, with a low around 56. Northeast wind 9 to 11 mph.

Tuesday: Mostly cloudy, with a high near 64. Northeast wind 10 to 13 mph.

Tuesday Night: Mostly cloudy, with a low around 57. East wind around 9 mph.

Wednesday: Mostly cloudy, with a high near 66. East wind 10 to 13 mph.

Wednesday Night: A chance of showers. Mostly cloudy, with a low around 58. East wind 8 to 10 mph. Chance of precipitation is 30%.

Thursday: A chance of showers. Mostly cloudy, with a high near 67. East wind 10 to 13 mph. Chance of precipitation is 40%.

Thursday Night: A chance of showers. Mostly cloudy, with a low around 58. East wind around 9 mph. Chance of precipitation is 40%.

Friday: A chance of showers. Partly sunny, with a high near 70. East wind around 11 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 are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds