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: Eastern Douglas County Foothills; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades
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...Snow expected. Total snow accumulations 10 to 15 inches, with up to 2 ft expected above 5000 ft. Winds gusting as high as 35 mph over high and exposed terrain. * WHERE...The southern Oregon Cascades and Siskiyou Mountains, and Eastern Douglas County Foothills. Including the locations of...Toketee Falls, Steamboat, Crescent Lake, Diamond Lake, Union Creek, Howard Prairie. This also includes the following passes or notable locations... Siskiyou Pass on I-5 at 4310 ft. Lake of the Woods on 140 at 5070 ft. Diamond Lake Junction on state highways 230 & 138 at 4478 ft. Mt. Ashland ski road and lodge at 6500 ft. Caves National Monument near highway 46 at 4000 ft. Willamette Pass on state highway 58 at 5090 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 Monday night into early 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.
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Weather Topic: What are Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
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