Offshore oil producers by Thursday had shut in 15% of production from rigs in the Gulf of Mexico in anticipation of Tropical Storm Hermine.
The number of platforms evacuated of non-essential staff had increased to 10. And gas production was also being limited.
These measures were being taken even as weather warnings indicated that the more severe threat was posed on land where Florida public officials were advising citizens to brace for flooding and damaging winds with the storm expected to become a hurricane.
Before being named, Tropical Storm Hermine had been referred to as Tropical Depression Nine.
The Bureau of Safety and Environmental Enforcement (BSEE), an agency under the Department of the Interior, is working with offshore drillers in the Gulf and with government agencies. Once the storm has passed it will inspect the offshore facilities for damage.