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Warm Weekend Weather Will Depart For June Gloom Early Next Week

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Expect continued warm weather through the weekend in Western Washington with morning clouds and temperatures in the high 70s to low 80s, according to Cliff Mass, KLPU's weather expert.

But the summer weekend weather won't hold through the early part of next week as clouds and rain move in and the temperature drops into the 60s, he added. Hikers in the Cascades will see the wet weather earlier with thunderstorms in the mountains predicted for this weekend.

"It will be quite a show," Mass said.

June Gloom

Mass said what people in the western United States talk about when they mention 'June Gloom' actually begins in late May. The eastern Pacific Ocean area as far south as San Diego gets shrouded in low cloud layers. This is because the ocean is still cool but the atmosphere has begun warming up. 

The warm upper air caps the cool lower layer of air and turns it into a consistent cloudy blanket. Coupled with high pressure in the eastern Pacific, it forms and then it lingers like an unwelcome house guest.

"We call this 'June Gloom,'" he said. "And were stuck in that. June is often a marginal month. "

Typically, it isn't until July 4 that the atmosphere warms up enough to evict the gloom, he said.

"We will have more June Gloom," he said. "We will have breaks too."

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The weekly KPLU feature "Weather with Cliff Mass" airs every Friday at 9 a.m. immediately following BirdNote, and twice on Friday afternoons during All Things Considered. The feature is hosted by KPLU Environment Reporter Bellamy Pailthorp. Cliff Mass is a University of Washington Professor of Atmospheric Sciences, a renowned Seattle weather prognosticator, and a popular weather blogger. You can also subscribe to a podcast of “Weather with Cliff Mass” shows.

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