Forecast Details for Williston, VT

Recent Locations: Williston, VT  
Overnight: Showers likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 47. South wind around 14 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday: Showers and thunderstorms likely, mainly before 11am. Mostly cloudy, with a high near 72. South wind 10 to 14 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night: A 50 percent chance of showers before 2am. Mostly cloudy, with a low around 45. Southwest wind 6 to 10 mph becoming north after midnight. New precipitation amounts of less than a tenth of an inch possible.
Monday: Partly sunny, with a high near 62. North wind 8 to 10 mph.
Monday Night: A 30 percent chance of showers after 3am. Increasing clouds, with a low around 47. North wind around 5 mph becoming light and variable in the evening. New precipitation amounts of less than a tenth of an inch possible.
Tuesday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 60. Southeast wind 5 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night: Showers likely, mainly before 2am. Mostly cloudy, with a low around 46. East wind 3 to 7 mph. Chance of precipitation is 60%.
Wednesday: A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 63. Light and variable wind becoming west 5 to 7 mph in the morning.
Wednesday Night: Mostly cloudy, with a low around 46. Calm wind becoming south around 6 mph after midnight.
Thursday: Partly sunny, with a high near 70. Southwest wind around 8 mph.
Thursday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 52. South wind 7 to 9 mph.
Friday: A 50 percent chance of showers. Mostly cloudy, with a high near 70. South wind 10 to 13 mph.
Friday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 50. South wind around 11 mph.
Saturday: A 30 percent chance of showers. Partly sunny, with a high near 64. South wind around 10 mph.

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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

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