Forecast Details for Happy Valley, OR

Recent Locations: Chatham, PA Hagan, GA Happy Valley, OR

Overnight: Clear, with a low around 62. West northwest wind around 5 mph becoming east.

Wednesday: Sunny, with a high near 83. North northeast wind 5 to 10 mph becoming west northwest in the morning.

Wednesday Night: Increasing clouds, with a low around 59. North northwest wind 6 to 10 mph, with gusts as high as 20 mph.

Thursday: Partly sunny, with a high near 78. North northwest wind around 6 mph becoming west southwest in the morning.

Thursday Night: A 40 percent chance of rain after 11pm. Mostly cloudy, with a low around 61. West wind around 7 mph becoming south southwest after midnight. New precipitation amounts between a tenth and quarter of an inch possible.

Friday: Rain likely. Cloudy, with a high near 68. Chance of precipitation is 70%.

Friday Night: Rain. Low around 63. Chance of precipitation is 90%.

Saturday: Rain likely before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 73.

Saturday Night: A chance of rain, mainly before 11pm. Mostly cloudy, with a low around 58.

Sunday: Partly sunny, with a high near 76.

Sunday Night: Partly cloudy, with a low around 56.

Monday: Mostly sunny, with a high near 76.

Monday Night: Mostly clear, with a low around 55.

Tuesday: Mostly sunny, with a high near 77.

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

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)

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 is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds