Alex Woolfall was on holiday at the Caribbean island of St Martin when the hurricane hit.
The PR consultant, from London, was forced to shelter in a concrete stairwell of the Westin Hotel as howling winds battered the building.
He wrote: “My God this noise! It’s like standing behind a jet engine!!
“Constant booms & bang. At least concrete stairwell not moving.”
Mr Woolfall said he was glad to be airlifted to safety in Puerto Rico by a military plane as powerful Hurricane Jose approached.
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He said: “I am just tired but very thankful to be here.
“I think probably all those on vacation would say it was a nightmare but it’s over for us.
“What about the people of St Martin and the other islands? I just hope the aid and support they need comes.”
He said Irma had wreaked total devastation on the island and said: “It’s very badly damaged and it’s heart-breaking to see people whose homes have been destroyed sitting outside in the street, especially when you see young children too.”
But throughout he said local hotel staff were hard at work even though their own homes had been damaged and the manager worked at getting people onto planes.
“I found that astonishing and very moving,” he added.
Meanwhile, Boris Johnson pledged to be there “in the long term” for British people whose Caribbean homes have been devastated by Hurricane Irma.
The Foreign Secretary said there had been an unprecedented effort from the UK to meet what had been an “unprecedented catastrophe in that part of the Caribbean”.
Mr Johnson said, in addition to the £32 million already set aside following the disaster, the Government would be matching public donations to the Red Cross appeal.
Returning from the latest of a series of emergency Cobra meetings, he said: “This is just the beginning. A terrible thing has happened to British overseas territories.
“These are British people and we are here for the long term and we will come through with a recovery plan working with our partners in the region.
“We will come through with a recovery plan for those islands and make sure they get back on their feet again.”
Irma has claimed at least 20 lives, including at least four in the British Virgin Islands and one each on Anguilla and Barbuda, and left thousands of people homeless when it smashed into the region on Wednesday.