Weather Alert in Washington
Fire Weather Watch issued July 11 at 8:24PM PDT until July 13 at 9:00PM PDT by NWS Spokane WA
AREAS AFFECTED: East Washington Central Cascades
DESCRIPTION: ...HOT, DRY, WINDY SUNDAY AFTERNOON AND EVENING... .Hot and dry conditions will be in place on Sunday. Westerly winds will increase through the day across the East Slopes and into the Western Columbia Basin. There is a 30-50% chance for wind gusts of 30 mph or stronger along the ridgetops of the Cascades, into the foothills, and on to the Waterville Plateau. The National Weather Service in Spokane has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Sunday afternoon through Sunday evening. * Affected Area: East Washington Central Cascades (Zone 696). * Winds: West 10 to 20 mph with gusts up to 30 mph. * Relative Humidities: 18 to 25 percent in eastern half of zone 696 including lower river valleys around Leavenworth, Ardenvoir, and lower Lake Chelan increasing to 30-40% closer to the crest. * Impacts: Rapid fire spread is likely with any new fires.
INSTRUCTION: A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
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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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