Forecast Details for Portland, OR

Recent Locations: Austin, TX Atlanta, GA Portland, OR

Tonight: Rain before 4am, then rain, possibly mixed with snow. Snow level 4500 feet lowering to 1800 feet after midnight . Low around 39. South southwest wind 5 to 13 mph becoming northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

Wednesday: A chance of rain and snow showers before 11am, then rain showers. Some thunder is also possible. Snow level 1900 feet. High near 53. Calm wind becoming west 5 to 9 mph in the morning. Chance of precipitation is 90%. Little or no snow accumulation expected.

Wednesday Night: Showers and possibly a thunderstorm. Snow level 1700 feet. Low around 37. West wind 5 to 9 mph becoming light southwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday: A 30 percent chance of showers after 11am. Snow level 1500 feet rising to 3000 feet in the afternoon. Partly sunny, with a high near 57. West southwest wind 3 to 7 mph.

Thursday Night: Partly cloudy, with a low around 39. West wind around 6 mph becoming calm in the evening.

Friday: Partly sunny, with a high near 60.

Friday Night: Mostly cloudy, with a low around 42.

Saturday: A slight chance of rain after 11am. Mostly cloudy, with a high near 66.

Saturday Night: Rain likely. Mostly cloudy, with a low around 49.

Sunday: Rain likely. Mostly cloudy, with a high near 63.

Sunday Night: A chance of rain. Mostly cloudy, with a low around 47.

Monday: A chance of rain. Partly sunny, with a high near 62.

Monday Night: A chance of rain. Mostly cloudy, with a low around 46.

Tuesday: A chance of rain. Partly sunny, with a high near 61.

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North America Water Vapor (Moisture)

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Weather Topic: What are Altocumulus Clouds?

Home - Education - Cloud Types - Altocumulus Clouds

Next Topic: Altostratus Clouds

Similar to cirrocumulus clouds, altocumulus clouds are characterized by cloud patches. They are distinguished by larger cloudlets than cirrocumulus clouds but are still smaller than stratocumulus clouds.

Altocumulus clouds most commonly form in middle altitudes (between 2 and 5 km) and may resemble, at times, the shape of a flying saucer. These uncommon formations, called altocumulus lenticularis, are created by uplift in the atmosphere and are most often seen in close proximity to mountains.

Next Topic: Altostratus Clouds

Weather Topic: What are Cirrocumulus Clouds?

Home - Education - Cloud Types - Cirrocumulus Clouds

Next Topic: Cirrostratus Clouds

Cirrocumulus clouds form at high altitudes (usually around 5 km) and have distinguishing characteristics displayed in a fine layer of small cloud patches. These small cloud patches are sometimes referred to as "cloudlets" in relation to the whole cloud formation.

Cirrocumulus clouds are formed from ice crystals and water droplets. Often, the water droplets in the cloud freeze into ice crystals and the cloud becomes a cirrostratus cloud. Because of this common occurrence, cirrocumulus cloud formations generally pass rapidly.

Next Topic: Cirrostratus Clouds