In the title of each plot, you will see something like the following...
The '00z' and '12z' are UTC times, or "Zulu Times". Look to see which of the 2 lines matches the "Direction for" in the title (the purple boxes). In this example the second line matches, so this plot is the "Tuesday, June 30, 2009, 5:00 am PDT forecast".
Warning: These date/time conversions are my calculations. They are not from the waveplot source site. Do not assume they are correct! Verify them to confirm their accuracy! Do not use as a basis for any decisions that could result in harm to people, critters, or property!
When viewing a plot, if you wish to refresh or print it, right-click with your mouse in the gray area above the plot and select from the menu.
What is UTC Time?
NOAA
WW3 Model Information
US Navy FNMOC