Thunderstorms Brew: Wildfire Risk Looms

A weather disturbance is forecast to cross Washington state on Wednesday, bringing a chance of thunderstorms, particularly after the noon hour. The highest likelihood for these storms is anticipated from Mount Rainier northward to the Canadian border and on the east slopes into northeast Washington by late afternoon and evening. A slight chance also exists for the Olympic range.

The Futuretrack Lightning forecast model indicates elevated lightning potential in these higher elevations and into British Columbia. Although these storms are not expected to produce prolific lightning, the general dryness across the state, including the Cascades and Olympics, heightens the risk of new fire ignitions.

Trees struck by lightning can smolder for extended periods before conditions allow for fire eruption. Those in mountainous or eastern Cascade regions should be vigilant from Wednesday late morning through the evening, with a possibility of activity extending into Thursday.

For lowland areas, the primary effects will be increased cloud cover and cooler temperatures, with Seattle expected to reach the mid-70s on Wednesday. Additionally, wildfire smoke is projected to drift into Western Washington from British Columbia starting Wednesday evening and continuing through Thursday.

Air quality may gradually worsen, potentially reaching the 'moderate' category or worse west of the Cascades by late Thursday into Friday under a more pessimistic scenario. Winds shifting over the weekend are expected to improve air quality west of the Cascades.