Weather Alert in Oregon
Winter Storm Warning 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 Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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