RED FLAG WARNING FOR THUNDERSTORMS THURSDAY, FIRE WEATHER WATCHES FOR WIND AND LOW HUMIDITY FRIDAY AND SATURDAY
First, a ridge breakdown will continue to bring a threat for thunderstorms across portions of Central and North-Central Washington into late Thursday night. Then, drier and windier weather arrives Friday and Saturday with critical fire weather conditions likely.
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Affected Area: Okanogan Valley (Zone 703) and Foothills of Central Washington Cascades (Zone 705).
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Lightning: 15 to 30 percent chance of thunderstorms through 2 AM Friday. Gusty and erratic outflow winds up to 35 mph possible with any thunderstorms.
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Winds: Friday afternoon winds - West/Southwest 10 to 20 mph with gusts up to 30 mph. Saturday afternoon winds - West/Southwest winds 15 to 30 mph with gusts around 30 to 40 mph.
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Relative Humidities: 11 to 25 percent.
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Impacts: New fire starts from lightning Thursday. New and existing fires could be impacted by gusty outflow winds. Gusty winds and low humidity Friday and Saturday afternoon may lead to rapid fire spread with any new or ongoing fires.
...RED FLAG WARNING FOR THUNDERSTORMS THURSDAY, FIRE WEATHER WATCHES FOR WIND AND LOW HUMIDITY FRIDAY AND SATURDAY... First, a ridge breakdown will continue to bring a threat for thunderstorms across portions of Central and North-Central Washington into late Thursday night. Then, drier and windier weather arrives Friday and Saturday with critical fire weather conditions likely. * Affected Area: Okanogan Valley (Zone 703) and Foothills of Central Washington Cascades (Zone 705). * Lightning: 15 to 30 percent chance of thunderstorms through 2 AM Friday. Gusty and erratic outflow winds up to 35 mph possible with any thunderstorms. * Winds: Friday afternoon winds - West/Southwest 10 to 20 mph with gusts up to 30 mph. Saturday afternoon winds - West/Southwest winds 15 to 30 mph with gusts around 30 to 40 mph. * Relative Humidities: 11 to 25 percent. * Impacts: New fire starts from lightning Thursday. New and existing fires could be impacted by gusty outflow winds. Gusty winds and low humidity Friday and Saturday afternoon may lead to rapid fire spread with any new or ongoing fires.
A Red Flag Warning means that critical fire weather conditions are either occurring now,.or will shortly. A combination of strong winds,low relative humidity,and warm temperatures can contribute to extreme fire behavior.
A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
Temperatures will still be very warm on Friday with high temperatures in the 90s to around 100 degrees, but will be below advisory criteria.
An Air Quality Alert has been issued by the following agencies: Washington Department of Ecology Colville Confederated Tribes Spokane Regional Clean Air Agency An Air Quality Alert has been issued for Chelan, Douglas, Garfield, and Asotin Counties and continues for Spokane, Whitman, Adams, Ferry, Lincoln, Okanogan, Grant, Adams, Whitman, Pend Oreille, and Stevens Counties, through Friday, July 24th at 11 AM, due to current and expected wildfire smoke from regional fires. Particulate matter (PM2.5) levels are expected to range in the Unhealthy for Sensitive Groups and Unhealthy categories. In Eastern Okanogan County near active wildfires, air quality may reach Very Unhealthy to Hazardous levels. When air quality is Unhealthy, everyone should reduce exposure. Limit time outside, avoid strenuous activity, and follow tips for cleaner indoor air.
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