Here's additional information I've gleaned from a closer reading of the
yacht race document I was sent. Evidently the April 19-23rd dates I gave
originally were for boats heading to the Philippines *after* the Hong Kong
race. The actual China Sea Hong Kong Yacht race has just started, and the
weather broadcast schedule is below.
I have to presume that the times given are Hong Kong local time (see
http://www.timeanddate.com/worldclock/city.html?n=102 for latest HK time and
info). Hong Kong is UTC +8 hours, so if 0833 is UTC, then the weather
forecast would be in late afternoon... not much help to the yacht crews, as
they would nearly be done with racing for the day. 0833 local time makes
much more sense to inform participants before setting sail. I could not find
any specific information positively indicating local time rather than UTC,
however.