People in Myanmar’s earthquake-stricken areas were braced for thunderstorms late Sunday, after heavy rains and winds the previous night disrupted rescue and relief operations and added to the misery of the many who lost their homes in the disaster and were forced to sleep in the open.

The official death toll from Myanmar’s earthquake disaster has surpassed 3,600, with more than 5,000 people injured and 160 still missing, as international rescue efforts wind down amid a relief effort hampered by extreme weather.