Hurricane Henriette tracked well off the Hawaiian Islands Tuesday, posing no hazard to the island chain, forecasters said. Henriette, with maximum sustained winds of 75 mph, was about 1,630 miles east-southeast of the islands, moving west-northwest at 10 mph, the National Hurricane Center in Miami said in its 2 a.m. PDT advisory. No coastal watches or warnings were in effect because of either storm, the center said. Henriette was forecast to shift to the northwest later Tuesday, then return to its west-northwest track Wednesday. The hurricane center said environmental conditions were favorable for Henriette to strengthen over the next 24 hours.