True LoisCane... but given that the advisory time has arrived... I would have thought that the NHC would issue a STDS in the interim, to say "Recent reports from hurricane hunter aircraft indicate that Tropical Storm Debby is forming in the northwest Caribbean Sea. A special advisory will be issued within the hour."
They've done that in the past in similar situations.

Having said that, they're just now issuing the entire Atlantic package, so maybe Dolly's advisory is just a few minutes late. NRL now has 04L.DOLLY posted but no track yet.