Forecast Details for Block Island, RI

Recent Locations: Bethera, SC Windsor, CT Block Island, RI

Today: A chance of showers, with thunderstorms also possible after 5pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 51. Breezy, with a southwest wind 13 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: Showers likely and possibly a thunderstorm, then showers after 8pm. Patchy fog. Low around 39. Northeast wind 8 to 17 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Thursday: Showers likely, mainly between 7am and 8am. Patchy fog. Otherwise, cloudy, with a high near 41. Northeast wind around 18 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night: A slight chance of showers. Patchy fog before 9pm. Otherwise, cloudy, with a low around 39. Northeast wind 8 to 15 mph. Chance of precipitation is 20%.

Friday: Mostly cloudy, with a high near 48. East wind 7 to 13 mph becoming southwest in the afternoon.

Friday Night: Mostly cloudy, with a low around 46. Southwest wind around 15 mph, with gusts as high as 25 mph.

Saturday: Partly sunny, with a high near 51. Southwest wind around 10 mph becoming south in the afternoon.

Saturday Night: Mostly cloudy, with a low around 44. East wind 11 to 13 mph.

Sunday: A chance of showers. Partly sunny, with a high near 51. Breezy, with a south wind 18 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 50%.

Sunday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 41. West wind 15 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%.

Monday: A chance of showers. Mostly sunny, with a high near 47. West wind 11 to 13 mph. Chance of precipitation is 30%.

Monday Night: Mostly clear, with a low around 39. West wind around 10 mph.

Tuesday: Mostly sunny, with a high near 44. North wind around 9 mph becoming southeast in the afternoon.

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National Weather Forecast--Current

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North America Water Vapor (Moisture)

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Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - 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