Now I don't know much about swell tracking or reading or much of that sort.

But I was wondering why sometimes swells tracked at larger heights, are posted as smaller on the chart? For instance, at 2pm sunday in monmouth county, it is listed as 4.6 feet. while 2 hours later it is listed as 3.0 with a second swell of 3.6. Why, on the chart, is that second set of swells listed as chest high while the 4.6 swell is listed as between waist and chest?