Weather Alerts for Oregon

Recent Locations: Trinidad, CA Packwaukee, WI Sheridan, OR

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

2. Freeze Warning for: Upper Hood River Valley

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

4. Freeze Watch for: Upper Hood River Valley

5. Frost Advisory for: Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills

6. Frost Advisory for: Jackson County

7. Frost Advisory for: Lower Columbia River; West Hills and Chehalem Mountains; Willapa Hills

8. 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

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

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

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

12. Winter Weather Advisory for: South Central Oregon Cascades

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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

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 Evaporation?

Home - Education - Precipitation - Evaporation

Next Topic: Fog

Evaporation is the process which returns water from the earth back to the atmosphere, and is another crucial process in the water cycle.

Evaporation is the transformation of liquid into gas, and it happens because molecules are excited by the application of energy and turn into vapor. In order for water to evaporate it has to be on the surface of a body of water.

Next Topic: Fog

Weather Topic: What are Fractus Clouds?

Home - Education - Cloud Types - Fractus Clouds

Fractus Clouds Next Topic: Freezing Rain

A fractus cloud (scud) is a fragmented, tattered cloud which has likely been sheared off of another cloud. They are accessory clouds, meaning they develop from parent clouds, and are named in a way which describes the original cloud which contained them.

Fractus clouds which have originated from cumulus clouds are referred to as cumulus fractus, while fractus clouds which have originated from stratus clouds are referred to as stratus fractus. Under certain conditions a fractus cloud might merge with another cloud, or develop into a cumulus cloud, but usually a fractus cloud seen by itself will dissipate rapidly.

They are often observed on the leading and trailing edges of storm clouds, and are a display of wind activity.

Next Topic: Freezing Rain