A comparison of ocean‐wave and microseism recordings is made for two cases of very high waves off southern New England. No prominent microseism activity of the type usually associated with marine cold fronts and cyclones occurred. However, very weak fairly regular microseisms of short period, only slightly above normal background, were observed. These correlate very well with times of high wave activity rather than with that of offshore winds and are suggested as being of true surf or shallow‐water wave origin. A third case is shown for control in which, following conditions similar to the above, an intense microseism storm was generated by a vigorous cold air mass moving offshore hand suggests that pressure fluctuations in this air mass are the generating mechanism.