KOTA BARU, Malaysia — Severe floods triggered by monsoon rains killed more than 30 people and displaced tens of thousands in Malaysia and southern Thailand, officials said on Tuesday, with both countries preparing shelters and evacuation plans in anticipation of more rains.

Malaysian Prime Minister Anwar Ibrahim said five days of heavier-than-expected rain that battered his country's east coast last week was equal to the rainfall recorded over the past six months, wreaking havoc in the northeastern state of Kelantan and neighboring Terengganu state.