Weather Alert in Washington
Red Flag Warning issued July 14 at 12:46PM PDT until July 14 at 11:00PM PDT by NWS Spokane WA
AREAS AFFECTED: Okanogan Valley
DESCRIPTION: ...HOT, DRY, WINDY MONDAY... .Gusty west to southwest winds will increase through the day. Winds will shift out of the north to northwest as a cold front passes. The Okanogan Valley will be especially windy with gusts of 45-60 MPH. * Affected Area: Okanogan Valley (Zone 703). * Winds: North 20 to 40 mph with gusts up to 50 mph. Brief wind gusts to 60 mph possible. * Relative Humidities: 17 to 28 percent. * Impacts: Extreme fire spread possible with any new or existing fires.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior.
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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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