They could have new storms off of the Irish coast. There is a low pressure system currently sitting over parts of the North Atlantic. Winds and storm conditions can be generated causing helicopter and refueling ships to travel out of the storm area in order to affect the refueling process. Helicopters in hover mode create large amounts of static electricity. While grounded to the refueling stations to prevent sparks from creating explosive conditions, an electrical storm in the area creates a whole new set of problems.
Visibility is also a weather influenced factor.
Fog is not unusual. When warm moist air meets cold air you get fog or clouds. The exact conditions of the North Atlantic during June. Jensen adds a postscript to the influence of weather factors. There are no other factors other than bad weather, visibility or the seas being rough.