If the source of the extra heat is not solar activity which wouldn't cause such a local phenomena, maybe it's volcanic. If it's volcanic, maybe it's tied to the fault lock.
Actually the "blob" of warm water is due to the persistent ridge of high pressure that has lingered off the W coast. The high pressure ridge is in turn a result of warm water in the tropics. See
Cliff Mass's Weatther Blog.
_________________________
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