Weather Alert in Oregon
Winter Weather Advisory issued February 15 at 11:20AM PST until February 19 at 10:00AM PST by NWS Medford OR
AREAS AFFECTED: Central Douglas County
DESCRIPTION: ...LOW SNOW LEVELS WITH MULTIPLE ROUNDS OF PRECIPITATION... .A sharp cold front will push through the region Monday night into Tuesday morning with a cold air mass to follow through at least Thursday. Snow levels will quickly lower from around 3000 ft during the day Monday to around 1000-1500 ft late Monday night into the early hours of Tuesday. Multiple waves of precipitation will move through the region while this cold air mass is in place, bringing multiple opportunities for low elevation snow. This will be a long duration event, and after the initial front Monday night, precipitation will become more showery, resulting in periods of spotty and quick accumulations. The values reflected below indicate totals over a 72 hour period from 10pm Monday through 10pm Thursday. Daytime heating will result in snow levels rising to around 2000-2500 ft during the daylight hours, then lower back down during the overnight periods. The best chances for accumulating snow down to valley floors will be during the overnight and early morning hours. * WHAT...For the Winter Weather Advisory below 1500 ft, wet snow expected. Total snow accumulations up to 0.5 to 2 inches, except 4 to 6 inches in the Camas Valley. For the Winter Storm Warning above 1500 ft, heavy snow expected. Total snow accumulations 6 to 10 inches, with 12 to 18 inches expected above 2500 ft. * WHERE...For the Winter Weather Advisory below 1500 ft, this includes the communities of Roseburg, Elkton, Sutherlin, Camas Valley and Canyonville as well as portions of I-5, including Roberts Mountain Pass on I-5 at 1000 ft, and Highways 42 and 130. For the Winter Storm Warning above 1500 ft, this includes the communities of Glendale and Tiller as well as portions of I-5 south of Canyonville and includes and Canyon Creek Pass on I-5 around 2000 ft. * WHEN...From 10 PM Monday to 10 AM PST Thursday. * IMPACTS...Travel may be very difficult to impossible. The hazardous conditions could impact the Tuesday morning and evening commutes. * ADDITIONAL DETAILS...The heaviest snow is expected late Monday night into Tuesday morning. Visit weather.gov/mfr/winter for snow probabilities.
INSTRUCTION: Slow down and use caution while traveling. Call 511 or visit tripcheck.com for road information. 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.
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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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