Forecast Details for Block Island, RI

Recent Locations: Cotati, CA Cora, WV Block Island, RI

This Afternoon: A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 51. Southwest wind 11 to 14 mph. Chance of precipitation is 30%. 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 rain after 7pm. Patchy fog before 9pm. Low around 40. Northeast wind 10 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: Rain likely, mainly before 8am. Patchy fog before 2pm. Otherwise, cloudy, with a high near 41. Breezy, with a northeast wind 18 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night: A slight chance of rain before 7pm, then a slight chance of rain after 11pm. Cloudy, with a low around 39. Northeast wind 9 to 15 mph. Chance of precipitation is 20%.

Friday: Cloudy, with a high near 49. East wind 6 to 13 mph becoming southwest in the afternoon.

Friday Night: Mostly cloudy, with a low around 45. Southwest wind 14 to 16 mph, with gusts as high as 26 mph.

Saturday: Partly sunny, with a high near 52. Southwest wind 8 to 11 mph becoming east in the afternoon.

Saturday Night: A chance of showers before midnight, then a chance of showers after 3am. Mostly cloudy, with a low around 43. East wind 10 to 13 mph. Chance of precipitation is 30%.

Sunday: Showers likely, mainly after 1pm. Partly sunny, with a high near 50. Breezy, with a southwest wind 18 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 60%.

Sunday Night: A chance of showers. Mostly cloudy, with a low around 41. West wind 11 to 17 mph. Chance of precipitation is 40%.

Monday: Mostly sunny, with a high near 47. West wind around 11 mph.

Monday Night: Mostly clear, with a low around 38. Northwest wind 7 to 10 mph.

Tuesday: Mostly sunny, with a high near 45. West wind 7 to 10 mph.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

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).

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

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.

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