Big Waves Rising Faster than Sea Level

Photo by Mila Zinkova, courtesy Wikimedia Commons

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The biggest waves in the Pacific Northwest are getting bigger. So are the smaller waves.

A new assessment of offshore data from Oregon and Washington finds the annual average heights of deep-water waves have increased since the mid-1970s—with both the low waves of summer and the highest storms waves of winter growing yearly.

Consequently the 100 year wave for this region just grew form a 33-foot wave to a 46-foot wave: a 40 percent rise. Furthermore, the really highest waves possible in the 100-year-event cycle are likely to rise above 55 feet, according to research published in Coastal Engineering.

Worse, the impacts of these storm waves will dwarf the impacts expected from sea level rise in coming decades.

I wrote about this phenomenon in MoJo’s All the Disappearing Islands in regards to the people of the Pacific islands nation of Tuvalu. Long before they’re actually drowned, low-lying islands and coastlines will become uninhabitable from periodic inundation by storm waves.

In the Pacific Northwest, increasing wave heights have already wrought three times more havoc from erosion, flooding, and coastal damage than is expected from sea level rise in the next few decades.

Add sea level rise to growing wave heights you get a seriously accelerated impact on coastlines.

The most likely cause? Global climate change, say the researchers—who note similarly rising wave heights in the North Atlantic, plus a rising in the total power generated by hurricanes yearly.

So for those who think a 1.5-degree F global temperature rise is inconsequential, here are a few of the deadly inconsequences.
 

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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