Weather Alert in Washington
Fire Weather Watch issued July 28 at 12:33PM PDT until July 30 at 9:00PM PDT by NWS Spokane WA
AREAS AFFECTED: East Washington Central Cascades
DESCRIPTION: ...HOT, DRY, AND UNSTABLE CONDITIONS WITH ISOLATED DRY THUNDERSTORMS WEDNESDAY AFTERNOON AND EVENING... The National Weather Service in Spokane has issued a Fire Weather Watch for hot, dry, and unstable conditions with isolated dry thunderstorms, which is in effect from Wednesday afternoon through Wednesday evening. * Affected Area: East Washington Central Cascades (Zone 696). * Timing: Wednesday afternoon and evening. * Relative Humidities: Min RH 20 to 30 percent. * Temperatures: 80-90 degrees. * Lightning: Isolated dry thunderstorms. * Outflow Winds: Gusty and erratic winds are possible with any thunderstorms that develop. The outflow winds could travel quite a distance from the core of the storm. * Impacts: Hot, dry, and unstable conditions Wednesday afternoon and evening may lead to rapid fire growth on any new or existing fires. Isolated dry thunderstorms will lead to the potential for new fire starts. Gusty winds with thunderstorms may result in rapid fire spread with any new or existing 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 is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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