Weather Alert in Washington
Fire Weather Watch issued August 23 at 2:37PM 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. In addition, we are monitoring the potential for isolated thunderstorms on Tuesday that could result in new fire starts. * 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 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. * Impacts: Hot, dry, 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 are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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