Sure, makes sense. The NWS forecast changes about every 6 hours for point forecasts.
The NWS forecast on your site is from Thursday, 16-Oct-2008 03:55 pm and starts with 'Tonight'
The WXSIM forecast on your site is from 16-Oct-2008 03:55 pm , but starts with 'This Afternoon'
Currently, there's no way to uniformly detect/correct this offset in the scripts (as the NWS uses a different set of verbiage for the 'current' period in the first icon position than WXSIM does). I try to minimize the problem by running the forecast for WXSIM every 2 hours on the :45 minute mark .. for me, it keeps them reasonably in sync.
Best regards,
Ken