Forecast Details for Clackamas, OR

Recent Locations: Kistler, WV Clyde, MO Clackamas, OR

Overnight: Partly cloudy, with a low around 65. Calm wind.

Thursday: Widespread haze between 10am and 5pm. Areas of smoke after 5pm. Sunny, with a high near 93. Calm wind becoming north northwest around 6 mph in the afternoon.

Thursday Night: Widespread haze between 8pm and 9pm. Areas of smoke before 8pm. Partly cloudy, with a low around 66. North northwest wind around 6 mph becoming calm in the evening.

Friday: A slight chance of showers, with thunderstorms also possible after 5pm. Mostly sunny, with a high near 90. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 20%.

Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Northwest wind around 6 mph becoming light and variable. Chance of precipitation is 40%.

Saturday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 40%.

Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 40%.

Sunday: A slight chance of showers. Partly sunny, with a high near 81.

Sunday Night: A slight chance of showers after 11pm. Mostly cloudy, with a low around 61.

Monday: A chance of showers, mainly after 11am. Mostly cloudy, with a high near 78.

Monday Night: A chance of showers. Mostly cloudy, with a low around 61.

Tuesday: Showers likely. Cloudy, with a high near 75.

Tuesday Night: A chance of showers. Mostly cloudy, with a low around 60.

Wednesday: A chance of showers. Mostly cloudy, with a high near 75.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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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