Weather Alert in Oregon
Air Quality Alert issued February 5 at 9:59AM PST by NWS Pendleton OR
AREAS AFFECTED: Deschutes, OR
DESCRIPTION: Oregon Department of Environmental Quality has issued an Air Quality Advisory until noon PST Saturday. For the Air Quality Advisory, stagnant air conditions will trap smoke and other air pollutants near the ground where people breathe. Check with your local health or air agency for current restrictions on woodstove use. There are often exceptions for those who use wood exclusively to heat their homes and those with limited income. People can take the following precautions to protect their health: * Follow local burn restrictions to prevent deteriorating air quality. * Avoid strenuous outdoor activity in smoky conditions. * People with heart or lung problems and young children are especially vulnerable. These people should stay indoors while smoke levels are high. * Use certified High Efficiency Particulate Air (HEPA) filters in indoor heating ventilation, cooling, and air purification systems. * Avoid using wood-burning stoves and other sources of indoor smoke if possible. For additional information...please visit the Web site at http://www.oregon.gov/DEQ
INSTRUCTION: N/A
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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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