The number of harbor porpoise strandings in May of 2014 was higher than usual (but not higher than the number in 2012). Joe Gaydos was quoted in the Journal of the San Juans:

In fact, according to Dr. Joe Gaydos of the Orcas Island-based SeaDoc Society, spring is the time of year when harbor porpoise typically migrate en masse from the mouth of Juan de Fuca Strait into the heart of the Salish Sea and strandings are not uncommon at that time. Still, Gaydos, who will perform the early June necropsies, said the spate of strandings warrant examination to find out if an infectious disease or virus, such as pneumonia, may be responsible or contributed to the deaths.