"Bil" wrote in message
...

I think it is pseudo-real time. The current display shows the Northeast
Monsoon flow over Asia and Tropical Storm Jane is shown at its real time
position, near New Caledonia and headed south towards the North Island of
New Zealand.

Yeah, the "about" page says that it's recomputed every three hours by a
supercomputer. So we're looking at the current day's winds. BTW the 1000hPa
part of the URL identifies the simulation as surface winds. Here's the about
page: http://earth.nullschool.net/#about

Tom