Weather Alert in Washington
Air Quality Alert issued September 1 at 10:59AM PDT by NWS Spokane WA
AREAS AFFECTED: Stevens, WA
DESCRIPTION: An Air Quality Alert has been issued by the following agencies: Washington Department of Ecology An Air Quality Alert has been issued for Stevens County until further notice due to current wildfire smoke from the Crown Creek fire, Katy Creek fire, and Blackhawk Mountain Fire. Particulate matter (PM2.5) levels are Unhealthy for Sensitive Groups. When air quality is Unhealthy for Sensitive Groups, residents should take steps to reduce exposure. Limit time outside, avoid strenuous activity, and follow tips for cleaner air. Everyone should watch for symptoms as a sign to reduce exposure.
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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