If you woke up to the sound of rumbling skies this morning, you aren’t imagining things. Western Washington—a place famously known for its quiet, steady drizzle—decided to trade its usual script for a full-on theatrical light show today.
After a stretch of warm, sunny July days, a sudden surge of subtropical moisture has pushed its way into the Pacific Northwest, bringing rare summer thunderstorms, lightning, and a much-needed dip in temperatures.
Here is a breakdown of what is happening across the region today, why it is happening, and when we will return to our regularly scheduled summer programming.
The Big Shakeup: Thunder, Rain, and SEA Airport Delays
For most of the day, a band of active showers and thunderstorms has been migrating across the Puget Sound lowlands.
- The Temperature Drop: After pushing into warmer territory recently, temperatures today are topping out at a comfortable 72°F. It’s a perfect excuse to open the windows and let the cool breeze in—assuming you don’t mind the occasional crack of thunder.
- Airport Disruption: The weather hasn’t just been a spectacle; it has caused real-world disruptions. Flights at Seattle-Tacoma International Airport (SEA) experienced delays earlier today as lightning and heavy downpours passed directly over the airfield.
- The “Monsoon” Connection: Why the sudden drama? Every so often in July or August, a plume of mid-level moisture from the desert southwest—essentially a piece of the North American Monsoon—gets pulled northward into our region. When that unstable, warm air collides with our cooler marine air, it acts like a spark, triggering the active cells we are seeing.
The Flip Side: High Fire Danger in the Mountains
While the rain and cooler air are a welcome treat for lowland lawns, the storm system brings a serious hazard to our local mountains.
The National Weather Service has issued a Red Flag Warning for both the Cascade and Olympic mountain ranges today. Thunderstorms in the high country often bring “dry lightning”—bolts that strike dry timber without enough rainfall to extinguish the resulting sparks.
Safety Reminder: With fire danger elevated in the mountains, regional forestry and fire crews are on high alert. If you are planning a hike or camping trip near the mountain passes this weekend, check local burn bans and stay updated on active conditions.
Looking Ahead: The Quick Return to Summer
Enjoy the cool air and the dramatic skies while they last, because this unstable weather pattern is a short-lived visitor.
The atmospheric transition starts almost immediately:
- Friday: The clouds will begin to break apart, pushing temperatures back up into the high 70s.
- The Weekend: High pressure builds back over the region, drying us out and pushing afternoon highs into the low-to-mid 80s by Sunday.
- Next Week: Get ready to sweat again. Forecast models are showing a steady warming trend, with temperatures climbing back up toward the upper 80s by Monday and Tuesday.
Today is a vivid reminder of just how dynamic Pacific Northwest summers can be. Grab a cup of coffee, watch the clouds roll over the Sound, and keep an ear out for those spectacular rumbles!