Cyclone Phet has not lessened in force to the degree expected as it passed over Oman, weather forecasters say.
Oil companies in Oman suspended their activities until the storm passed over, but said there had been little damage and no casualties reported.
They said they did not expect delays to oil deliveries.
Pakistan now on alert as the hurricane winds are likely to arrive there on Sunday. Pakistan's emergency agency said the country needed to be ready.
The category four storm weakened to category two as it hit the Omani coast overnight, but forecasters who had expected it to weaken further said on Friday it had not done so.
The cyclone had "not dissipated to the extent we were earlier anticipating, which means it could be very dangerous when it hits Pakistan," Nadeem Ahmed, head of the National Disaster Management Agency, told reporters.
Aid workers have been told to prepare for electricity cuts and floods in Karachi, Pakistan's biggest city and crucial sea port.
A cyclone is the meteorological name for hurricanes in the Indian Ocean and western Pacific.