Weather Alert in Oregon
Winter Weather Advisory issued April 25 at 2:54AM PDT until April 27 at 12:00AM PDT by NWS Portland OR
AREAS AFFECTED: North Oregon Cascades; Cascades of Marion and Linn Counties; Cascades of Lane County; South Washington Cascades
DESCRIPTION: * WHAT...Snow expected above 4500 ft. Snow levels hover at 5500 to 6000 ft today, but lower to 5000 ft tonight, and down to 4500 feet on Friday. Total snow accumulations of 2 to 8 inches, with 8 to 15 inches above 5500 feet. * WHERE...West Slopes of the Northern and Central Oregon Cascades, and South Washington Cascades. * WHEN...This afternoon through Friday evening. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Recent warm temperatures will likely delay and diminish accumulations on paved road surfaces. Amounts will be highest above 5500 feet.
INSTRUCTION: Slow down and use caution while traveling. For the latest road conditions call 5 1 1, or visit for Oregon: https://www.tripcheck.com and for Washington: https://wsdot.com/travel/real-time/map
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - 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