Weather Alert in Washington
Fire Weather Watch issued August 23 at 5:53AM 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... .A strong ridge of high pressure will bring a period of hot and dry conditions to the central and northern Cascades of Washington this weekend. The ridge will shift east of the Cascades early next week with the atmosphere becoming more unstable at that time. Increased instability with hot and dry conditions will bring the potential for critical fire weather conditions. * 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: East-southeast 3 to 7 mph in the afternoon becoming west 5 to 10 mph in the evening. * Timing: Afternoon and evening for both Monday and Tuesday. * Relative Humidities: Below 4,000 feet: 13 to 20 percent. Above 4,000 feet: 20 to 30 percent. * Temperatures: Below 4,000 feet: 90 to 102 degrees. Above 4,000 feet: 75 to 90 degrees. * Impacts: Hot, dry, and unstable conditions may lead to rapid fire growth on 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 Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
Weather Topic: What are Stratocumulus Clouds?
Home - Education - Cloud Types - Stratocumulus Clouds
Next Topic: Stratus Clouds
Stratocumulus clouds are similar to altocumulus clouds in their
fluffy appearance, but have a slightly darker shade due to their additional mass.
A good way to distinguish the two cloud types is to hold your hand out and measure
the size of an individual cloud; if it is the size of your thumb it is generally
an altocumulus cloud, if it is the size of your hand it is generally a
stratocumulus cloud.
It is uncommon for stratocumulus clouds to produce precipitation, but if they do
it is usually a light rain or snow.
Next Topic: Stratus Clouds
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