Weather Alert in Oregon
Winter Weather Advisory issued February 18 at 4:58AM PST until February 19 at 10:00AM PST by NWS Medford OR
AREAS AFFECTED: Central Douglas County
DESCRIPTION: * WHAT...For the Winter Weather Advisory below 1500 ft, wet snow. Additional snow accumulations up to 3 inches. For the Winter Storm Warning above 1500 ft, heavy snow. Additional snow accumulations 3 to 6 inches, except up to 10 inches above 2500 ft. * WHERE...For the Winter Weather Advisory below 1500 ft, this includes Roseburg, Elkton, Sutherlin, Camas Valley and Canyonville as well as portions of I-5, including Roberts Mountain Pass, and Highways 42 and 138. For the Winter Storm Warning above 1500 ft, this includes Glendale and Tiller as well as portions of I-5 south of Canyonville and Canyon Creek Pass on I-5 around 2000 ft. * WHEN...Until 10 AM PST Thursday. * IMPACTS...Travel may be very difficult to impossible. The hazardous conditions could impact the evening and morning commutes. * ADDITIONAL DETAILS...Another round of snowfall is expected tonight into Thursday. Visit weather.gov/mfr/winter for additional snow probabilities.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Call 511 or visit tripcheck.com for road information. Slow down and use caution while traveling. Call 511 or visit tripcheck.com for road information.
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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
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