Weather Alert in Oregon
Winter Weather Advisory issued March 3 at 2:44AM PST until March 4 at 10:00PM PST by NWS Medford OR
AREAS AFFECTED: South Central Oregon Cascades
DESCRIPTION: * WHAT...Snow expected above 5000 feet. Total snow accumulations 7 to 10 inches. Winds gusting as high as 40 mph over high and exposed terrain. * WHERE...South Central Oregon Cascades, including Diamond Lake and Crater Lake National Park impacting highways 138, 230 and 62. * WHEN...From 4 AM to 10 PM PST Wednesday. * IMPACTS...Plan on slippery road conditions and delays in your commute. The hazardous conditions could impact the Wednesday morning and evening commutes. * ADDITIONAL DETAILS...Probability of snow accumulation between 4 AM Wednesday to 4 AM Thursday. Probabilities don't always overlap the hazard's time range. Location >= >= >= >= 4in 6in 8in 12in -------- ---- ---- ---- ---- Crater 100% 94% 71% 36% Lake Visit weather.gov/mfr/winter for additional 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 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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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