https://www.ndbc.noaa.gov/show_plot.php?station=ptww1&meas=avpd
NDBC - 5-day plot - Average Wave Period at PTWW1
National Data Buoy Center - 5-day plot - Average Wave Period at station PTWW1 (48.111N 122.760W) - 9444900 - Port Townsend, WA.
ndbcdayplotaveragewave