king tides

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Help Document Bay Area High Tides

King tides return to the Bay Area, augmented by a long-awaited winter storm.

Jack Gregg

High tide at Pier 14 in San Francisco during the winter of 2011.

No one knows exactly how much sea level rise the San Francisco Bay Area can expect from climate change, but king tides — extremely high seasonal tides — may give insight into what could be normal in the future.

Starting today and continuing through Sunday, king tides are expected in the morning hours around the Bay Area. Recent rainstorms and the accompanying runoff will likely make these tides even bigger. The California King Tides Initiative is again asking for citizens to document the visual effects of king tides and add them to a Flickr photo pool to help give a perspective on how sea level rise might change local landscapes.

Sea levels have risen about eight inches in the last century and the San Francisco Bay Conservation & Development Commission (BCDC) has warned that the area should be ready for 16 inches of sea level rise by mid-century.

Storm Surges and King Tides

Pacific storm makes for some high tides and scary waves on the Bay

Waves slosh on to San Francisco's Embarcadero during Thursday's "king tide" (Photo: Gretchen Weber)

Take naturally-occurring extremely high tides, and add to them high winds and torrential rain, and you get some pretty big seas.

At least, that’s what I got out on the San Francisco Bay today.  How big exactly, is hard to say (our uneducated guessed ran the gamut), but they were big enough to wash over the bow of our 26-foot boat on more than one occasion and to keep most of us aboard holding on for dear life for much of the three-hour voyage.   What I can say for sure is that as I type this blog post, four hours later, my body still feels like I’m rolling up and down and back and forth on some stormy seas.

We braved the weather today to check out the latest round of “king tides” and see how they affect low-lying shorelines in places like Crissy Field, Treasure Island, and SFO. The seas were so rough that we didn’t make it all the way to the airport, but we did see waves crashing over the sea wall along the Embarcadero  just south of the Ferry Building (see video below). At Crissy Field, the beach was nearly submerged and a small footbridge near the mouth of the estuary was almost awash. Continue reading

Photograph High Tides, Glimpse the Future?

High tide at Pier 14 in San Francisco on January 19, 2011 (Photo: Jack Gregg)

This week another round of extremely high tides will hit the California coast, providing a glimpse of what the state can expect as sea levels continue to rise. These “king tides” will roll in from February 16th through the 18th, with the highest swells expected on the morning of the 17th, between 7:30 and 9 a.m.

A consortium of environmental groups is again calling for help documenting these high tides. The San Francisco Bay National Estuarine Reserve (NERR), which is spearheading the local effort, has set up a Flickr site where members of public can share their photos.  Organizers launched the site last month, in time for the king tides in January, and since then more than 80 photos have been uploaded by dozens of contributors. Continue reading