Weather Watch

Hey, SLO County surfers. Thank a ‘waverider’ buoy for those accurate surf reports

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Most of us enjoy a big storm or watching large waves crashing along our stunning coastline and the surfers who harness the waves’ power for enjoyment. But it’s also serious business for those who make their living from the sea and others who rely on accurate weather forecasting.

To help predict storms and swells that move in from the world’s oceans, the Coastal Data Information Program (CDIP) at the Scripps Institution of Oceanography in San Diego and the National Data Buoy Center at the Stennis Space Center in Mississippi operate a vast network of buoys that dot the Pacific, Atlantic and Gulf of Mexico.

These marine buoys provide invaluable sea/swell data such as wave height, period, incoming direction and sea surface temperatures and act as long-range sentinels.

Over the years, the number of buoys has increased, which is terrific news, and here’s why.

CDIP started in 1975, when Dr. Richard Seymour and his team installed a single wave measurement station at Imperial Beach near San Diego. It used underwater pressure sensors and transmitted its data through armored electrical cables through the surf zone to a nearby land-based field station. In the late 70s, waverider buoys manufactured by Datawell, a private company based in the Netherlands, came into use, allowing data collection from locations farther offshore by utilizing radio telemetry and not underwater cables.

DCPP waverider 1.jpg
Diablo Canyon waverider buoy. John Lindsey Special to The Tribune

Today, waverider buoys not only measure wave height and period along with sea-surface temperature but also wave direction. Currently, most of the waverider buoys now transmit their data through the Iridium satellite constellation.

Over the past decades, the CDIP team initially led by David Castel, Dr. Robert Guza, Dr. William O’Reilly and now Julie Thomas has vastly expanded this program with primary funding from U.S. Army Corps of Engineers and the California Division of Boating and Waterways.

When I started weather and oceanographic forecasting at Diablo Canyon in 1992, CDIP had around a dozen waverider buoy stations mostly along the West Coast — including the Diablo Canyon buoy. At that time, a large-grey metal box that contained the waverider receiver, processor and 300-baud modem was installed at the ocean lab near the Diablo Canyon Marina. Every 30 minutes, the old familiar dial-up sound of that modem would radiate throughout the lab as CDIP collected wave data over the phone line.

Diablo Canyon’s wave measuring device was installed with funding by PG&E in June 1983 after a fearsome El Niño-driven storm from the southwest destroyed the 2,700-foot-long wooden Unocal Pier in Port San Luis on March 1, 1983. It was later replaced with a steel-and-concrete structure in 1984, which became the Cal Poly Pier.

The Cal Poly Pier in Avila Beach, California, provides a place for students to research marine life off the coast of San Luis Obispo County.

Today, the CDIP network has expanded to well over 100 stations in the western hemisphere with many of these buoys deployed along Atlantic coasts and as far away as Guam and Brazil.

You can see the buoy data at cdip.ucsd.edu. Interesting to note, one of these buoys off St. Petersburg, Florida (Egmont Channel Entrance), reported seawater temperatures as high as 89 degrees on Friday.

Two different buoy stations are especially important for longer-range wave forecasting along the West Coast: NOAA’s SE PAPA and CDIP’s Ocean Station Papa stations located in the Gulf of Alaska.

Unfortunately, both of these buoys have been offline. CDIP’s waverider buoy broke away from its 14,000-foot mooring back in October 2017 and eventually washed up on a beach in British Columbia. Data from NOAA’s SE PAPA buoy has been deemed unreliable and is no longer being released as of April 2018. Data is expected to be restored when the crew of a U.S. Coast Guard Cutter (a sea-going buoy tender boat) repairs it.

On a very positive note, CDIP, in collaboration with the University of Washington, redeployed the waverider buoy at the Ocean Station Papa last week. Wave spectral information from this location will provide a treasure trove of useful data that can be directly related to future weather and oceanographic conditions along the West Coast.

These replacements and repairs are happening just in time to help predict this winter’s possible El Niño driven storms.

John Lindsey’s column is special to The Tribune. He is PG&E’s Diablo Canyon marine meteorologist and a media relations representative. Email him at pgeweather@pge.com or follow him on Twitter: @PGE_John.
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