Weather Alert in Washington
Fire Weather Watch issued July 30 at 4:07AM PDT until July 31 at 8:00PM PDT by NWS Spokane WA
AREAS AFFECTED: East Portion of North Cascades National Park / Lake Chelan National Recreation Area; East Washington North Cascades; Okanogan Highlands & Kettle Mountains; Colville Reservation; Okanogan Valley; Methow Valley
DESCRIPTION: ...HOT, DRY, AND UNSTABLE CONDITIONS WITH ISOLATED DRY THUNDERSTORMS WEDNESDAY AFTERNOON AND EVENING FOR ZONE 696... ...POTENTIAL FOR SCATTERED DRY THUNDERSTORMS FOR 697, 698, 699, 702, 703, 704 THURSDAY AFTERNOON AND EARLY EVENING... The National Weather Service in Spokane has issued a Fire Weather Watch for ABUNDANT LIGHTNING, which is in effect from Thursday afternoon through Thursday evening. * Affected Area: East Portion of North Cascades National Park/Lake Chelan National Recreation Area (Zone 697), East Washington North Cascades (Zone 698), Okanogan Highlands and Kettle Mountains (Zone 699), Colville Reservation (Zone 702), Okanogan Valley (Zone 703) and Methow Valley (Zone 704). * Timing: 1 PM to 8 PM Thursday * Thunderstorms: Scattered thunderstorms with abundant lightning. * Outflow Winds: Outflow boundaries near storms will bring potential for erratic wind gusts 30 to 50 mph and could travel quite a distance from the core of the storm. * Impacts: Very warm and dry conditions will be in place as storms develop Thursday afternoon. A mix of wet and dry thunderstorms combined with dry fuels will lead to the potential for new fire starts that may overwhelm initial attack capabilities. Gusty outflow winds could may result in rapid spread with any new starts.
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 Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
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