These impressive 75-feet waves pictured here by Robert Brown (©http://www.surfline.com) were surfed around 3 PM PST (21 PM UTC).The closest image computed using the swell spectra observed from space by ENVISAT satellite shows indeed that large wave length swell group (up to more than 500 meter wave length!) was detected (blue frame) and followed coming from north-west, generated by a big storm south of Alaska. The full animation (below) computed over the previous and next days gives a better idea on how they have propagated to Cortes Bank. Similar swell systems generated by big storms all over the world can be measured and monitored daily thanks to this great instrument, and compared for instance to wind observations by other satellites - helping to characterize the intensity of these storms when winds are too strong to be accurately estimated by either models or satellites - or ... surfer reports! Learn more on how these animations are produced and have a look from time to time to these nice "fireworks" refreshed daily by reading this related page.