Weather Alerts for Oregon

Recent Locations: Uledi, PA Greentown, PA Medford, OR

Current Alerts for Medford, OR: Frost Advisory

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 Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds