Looking at the URL and having poked around the site in the past, I believe this link is a forecast model for 1:00 am PST on 12/11 (an hour from this post, and 2 or 3 hours from your post).
My understanding is that much of the visualization is based on modeling with real weather inputs, not actual current weather conditions. In other words, recent weather measurements feed into a calculation of current and near future weather conditions. I could be quite mistaken though.
The credits list the NOAA Environmental Modeling Center [1] as the source for weather data, that would be a great place to start for further clarification.
My understanding is that much of the visualization is based on modeling with real weather inputs, not actual current weather conditions. In other words, recent weather measurements feed into a calculation of current and near future weather conditions. I could be quite mistaken though.
The credits list the NOAA Environmental Modeling Center [1] as the source for weather data, that would be a great place to start for further clarification.
[1] http://www.emc.ncep.noaa.gov/