Weather Alert in Washington
Red Flag Warning issued August 25 at 6:32AM PDT until August 26 at 9:00PM PDT by NWS Spokane WA
AREAS AFFECTED: East Washington Central Cascades; East Portion of North Cascades National Park / Lake Chelan National Recreation Area; East Washington North Cascades; Methow Valley
DESCRIPTION: ...HOT, DRY, AND UNSTABLE CONDITIONS FOR MONDAY AND TUESDAY ALONG WITH THE POTENTIAL FOR ISOLATED THUNDERSTORMS WITH GUSTY OUTFLOW WINDS... .Hot, dry, and unstable conditions are forecast along the East Slopes of the Central and Northern Cascades as well as the Methow Valley Monday and Tuesday. In addition, we are monitoring the potential for isolated thunderstorms on Monday and Tuesday afternoons that could result in new fire starts along with gusty outflow winds. * Affected Area: East Washington Central Cascades (Zone 696), East Portion of North Cascades National Park/Lake Chelan National Recreation Area (Zone 697), East Washington North Cascades (Zone 698) and Methow Valley (Zone 704). * Winds: Southeast around 5 mph in the afternoon shifting to northwest in the evening, except gusty outflow winds near thunderstorms. * Timing: Afternoon and evening for both Monday and Tuesday. * Relative Humidities: Below 4000 feet: 13 to 20 percent. Above 4000 feet: 20 to 30 percent. * Temperatures: Below 4000 feet: 90 to 102 degrees. Above 4000 feet: 75 to 90 degrees. * Lightning: A 5-10 percent chance of dry thunderstorms late Monday afternoon into the evening. A 20-25 percent chance of thunderstorms Tuesday afternoon and evening mainly over the higher terrain. * Impacts: Hot, dry, unstable conditions may lead to rapid fire growth on any new or existing fires. Isolated thunderstorms will bring the potential for new fire starts, as well as gusty outflow winds.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly.
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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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