© National Oceanic and Atmospheric AdministrationA satellite image shows the storm off the Oregon coast on Nov. 26.
The Thanksgiving-week "bomb cyclone" storm that drenched California not only set a record for the lowest pressure recorded in the state, but also generated a 75-foot wave off Cape Mendocino.
At 7:33 p.m. on Nov. 26, the No. 94 Cape Mendocino buoy operated by Scripps Institution of Oceanography Coastal Data Information Program recorded a maximum significant wave height of 43.1 feet,
and that night also measured a wave of 75 feet. These waves were in water 1,132 feet deep and were at 13.3-second intervals.
Also at 7:33 p.m., the program's No. 168 Humboldt Bay North Spit buoy recorded significant wave heights of 37.6 feet, but in shallower water.
Significant wave height is the average of the biggest one-third of waves over a 30-minute period, according to James Behrens, a program manager at the Coastal Data Information Program. Typically, some waves at a given station are expected to be about twice as large as that average, hence the 75-footer.
The only significant wave height that the program has measured — higher than the one recorded at Cape Mendocino — was on a buoy at Ocean Station Papa, far out in the North Pacific, in December 2012. That was 49.8 feet.
Comment: Some other rare, unseasonal and very large tornadoes to have formed around the planet this year include:
Such information and much more, are explained in the book Earth Changes and the Human Cosmic Connection by Pierre Lescaudron and Laura Knight-Jadczyk. See also: Thunderbolts Space News: Tornadoes - The Electric Model