Forecast Details for Arco, ID

Recent Locations: Leming, TX Bolingbrook, IL Arco, ID

Today: Mostly sunny, with a high near 72. Breezy, with a north wind 5 to 10 mph becoming south 16 to 26 mph in the afternoon. Winds could gust as high as 34 mph.

Tonight: A slight chance of showers before 4am, then a chance of showers after 5am. Partly cloudy, with a low around 35. Breezy, with a south wind 21 to 26 mph decreasing to 14 to 19 mph after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 30%.

Wednesday: Rain and snow showers before noon, then snow showers between noon and 3pm, then rain, possibly mixed with snow showers after 3pm. Some thunder is also possible. High near 49. Breezy, with a southwest wind 16 to 21 mph increasing to 23 to 28 mph in the afternoon. Winds could gust as high as 37 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

Wednesday Night: Rain and snow showers likely, becoming all snow after 9pm. Cloudy, with a low around 28. Breezy, with a west southwest wind 20 to 25 mph decreasing to 14 to 19 mph after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

Thursday: A 50 percent chance of snow showers. Partly sunny, with a high near 50. West southwest wind 10 to 18 mph, with gusts as high as 25 mph. Little or no snow accumulation expected.

Thursday Night: A 40 percent chance of snow showers. Mostly cloudy, with a low around 25. New snow accumulation of less than a half inch possible.

Friday: A 40 percent chance of snow. Partly sunny, with a high near 44. Little or no snow accumulation expected.

Friday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 22.

Saturday: Mostly sunny, with a high near 48.

Saturday Night: Partly cloudy, with a low around 25.

Sunday: A slight chance of rain and snow. Mostly sunny, with a high near 50. Chance of precipitation is 20%.

Sunday Night: Mostly cloudy, with a low around 28.

Monday: Mostly sunny, with a high near 53.

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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

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds