Residents of Florida may have to evacuate their homes after Hurricane Dorian strengthened to an extremely dangerous category 4 storm.
Evacuations have already begun in the Bahamas, with maximum sustained winds of 225 kilometers per hour expected.
US President Donald Trump says it could be "record-breaking".
Orlando International Airport is planning to shut down commercial operations on Monday as a precaution.
Aer Lingus says it is closely monitoring the situation but flights EI121 and EI120 to/from Orlando on Monday have now been canceled.
Tropical-storm-force winds from #Dorian could begin in parts of Florida *as early as* Saturday evening or Saturday night. Now is the time to begin thinking about what kinds of preparations you might need to make over the next couple of days. https://t.co/yChCF6oWL9 pic.twitter.com/sY8jyYVaxz
— National Hurricane Center (@NHC_Atlantic) August 29, 2019