The deluge has hit 10 provinces across the country's south over the past week, with the city of Hat Yai, a business hub bordering Malaysia, recording its heaviest rainfall in 300 years - 335mm in a single day. Photos show vehicles and houses submerged in the city, while desperate residents await rescue on their rooftops. Relentless rains have also ravaged neighbouring countries. In Vietnam, the death toll has risen to 98 in a week, while in Malaysia, more than 19,000 people have been forced from their homes.

In Indonesia, at least 19 people have been killed and at least seven others remained buried under landslides in North Sumatra, according to the Indonesian National Search and Rescue Agency. More than 2 million people in Thailand have been affected by the floods, but just 13,000 have been moved to shelters.

The vast majority are cut off and unable to get help, according to Reuters news agency. The Thai military, which has been put in charge of tackling the crisis, said it is preparing to dispatch an aircraft carrier and a flotilla of 14 boats loaded with relief supplies, along with field kitchens that are said to be able to deliver 3,000 meals a day. Medical teams on board the aircraft carrier will convert it into a "floating hospital" if required, the navy said.

Boats, high-clearance trucks, and jet skis have also been deployed to evacuate residents, said the governor of Songkhla province, where Hat Yai is located. The cabinet on Tuesday declared Songkhla a disaster zone, freeing up funds for relief.  However, many people remain stranded amid the rising waters. A volunteer rescue group, the Matchima Rescue Center, told Reuters it had been inundated with thousands of calls in the last three days, with people asking to be evacuated. (BBC)