Forecasters issue warning for lightning, possible wildfires

Forecasters issue warning for lightning, possible wildfires
A helicopter dumps water on a brush fire about five miles north of Shelton on Friday.
SEATTLE - With the sweltering heat of the past few days just a memory in Western Washington, forecasters are now keeping an eye on a potential weather threat from lightning and super-dry conditions over the afternoon and evening hours Saturday and early on Sunday.

The National Weather Service has issued a Red Flag Warning for critical fire conditions for most of Western Washington through Sunday morning.

The warning even includes the Puget Sound metro and other lowland areas that are rarely given such warnings.

A Red Flag Warning means that conditions are already conducive for fires to easily begin and if a brush fire or wildfire were to be started - be it caused by humans or lightning - a combination of strong winds, low humidity and warm temperatures will create explosive fire growth potential.

Seattle hasn't seen measurable rain since July 22 - a period of 27 days - and hasn't seen significant rain since July 20. The past week's stretch of temperatures in the 80s and 90s with low humidity has only dried out everything further.

Outdoor burn bans remain in effect for much of Western Washington, including King, Snohomish, Pierce, Kitsap and Thurston County.

Mid-level moisture and instability were streaming across the Puget Sound region throughout the afternoon, but as of 4:30 p.m. all of the lightning strikes had occurred offshore over the coastal waters, and none had yet struck over land.

View an animated radar loop of approaching weather systems »:

Even so, the threat of isolated to scattered lightning continues for the region, the National Weather Service warns, with very little accompanying rainfall.

The highest risk for lightning late on Saturday afternoon stretched from near Chehalis north-northwest to near Port Angeles.

The highest risk will shift northeast Saturday evening, reaching a line from Snoqualmie Pass to the San Juan Islands by 11 p.m. The risk will continue northeast overnight into the North Cascades.

A little residual lightning is possible over both the central and north Cascades on Sunday morning.

If you'll be outside just be sure to keep an eye to the south for any approaching storms and move inside if they approach. These storms have potential for quite a bit of lightning, if not much rain (these are more the desert-type mainly dry thunderstorms).

The thunderstorms will move off to the north by dawn Sunday and the rest of the day should feature calmer conditions with just some marine clouds giving way to sunshine. No additional thunderstorm threats are foreseen through the rest of next week.