Weather Alerts for Oregon

Recent Locations: Mapaville, MO Paron, AR Powell Butte, OR

1. Freeze Warning for: Foothills of the Northern Blue Mountains of Oregon; Kittitas Valley; Yakima Valley

2. Freeze Watch for: Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills

3. Freeze Watch for: Upper Hood River Valley

4. Frost Advisory for: Jackson County

5. Frost Advisory for: North Oregon Coast Range Lowlands; Central Oregon Coast Range Lowlands; North Oregon Coast Range; Central Oregon Coast Range; Tualatin Valley; West Central Willamette Valley; East Central Willamette Valley; Benton County Lowlands; Linn County Lowlands; Lane County Lowlands; Clackamas County Cascade Foothills; Cowlitz County Lowlands; North Clark County Lowlands; South Washington Cascade Foothills

6. Winter Storm Warning for: East Slopes of the Oregon Cascades

7. Winter Storm Warning for: North Oregon Cascades; Cascades of Marion and Linn Counties; Cascades of Lane County; South Washington Cascades

8. Winter Weather Advisory for: Clackamas County Cascade Foothills

9. Winter Weather Advisory for: Northern Blue Mountains of Oregon; Northwest Blue Mountains

10. Winter Weather Advisory for: South Central Oregon Cascades

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

National Weather Forecast--Current

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National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

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