Here is the best satellite monitoring data on chlorophyll that I could find for May 13 when Art and Hank were reporting June Grass in Blue Mountain and Henderson:

7 day composite of chlorophyll readings up to May 13. Redder = more chlorophyll. I got this image from data provided by University of South Florida College of Marine Science Optical Oceanography Laboratory

Here is a link to the University of South Florida site that I have been using. Make sure you are looking at chlorophyll data and not surface temperature data.