Forecast Details for Nantucket, MA

Recent Locations: Nantucket, MA  
Today: Rain. Patchy fog. High near 47. North wind 7 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tonight: Rain. Patchy fog before midnight. Low around 39. North wind 14 to 17 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Friday: Rain likely, mainly before 2pm. Mostly cloudy, with a high near 46. Breezy, with a northwest wind around 24 mph, with gusts as high as 36 mph. Chance of precipitation is 70%. New precipitation amounts between three quarters and one inch possible.
Friday Night: A chance of rain, mainly before 9pm. Partly cloudy, with a low around 36. Breezy, with a west wind 18 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday: Sunny, with a high near 47. West wind around 18 mph, with gusts as high as 28 mph.
Saturday Night: Partly cloudy, with a low around 38. West wind 11 to 17 mph.
Sunday: Mostly sunny, with a high near 47. West wind 11 to 14 mph.
Sunday Night: Partly cloudy, with a low around 37. Northwest wind 13 to 15 mph.
Monday: Mostly sunny, with a high near 46. North wind 9 to 13 mph.
Monday Night: Mostly cloudy, with a low around 38. Southeast wind 8 to 10 mph.
Tuesday: Rain likely. Mostly cloudy, with a high near 46. East wind 14 to 17 mph. Chance of precipitation is 60%.
Tuesday Night: Rain likely. Mostly cloudy, with a low around 38. Breezy, with an east wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Wednesday: A chance of rain. Mostly cloudy, with a high near 46. Breezy, with an east wind 18 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

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)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

North American Water Vapor Map

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Precipitation Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet