From the AP:
Hurricane warnings have been issued for the U.S. Virgin islands, Puerto Rico's Vieques and Culebra islands and other islands in the region.
Officials in Puerto Rico, already soaked from several days of rain, are warning residents to prepare for a lot more.
Omar's maximum sustained winds are near 75 mph (120 kph) early Wednesday. But the National Hurricane Center in Miami says the hurricane is expected to strengthen.