Office workers were surprised after thousands of large size hail stones hit their building during a tropical storm in Mukdahan, north-eastern Thailand on April 25.

There have been outbreaks of summer storms with thunder and lightning as the country moves into its hot, summer period with temperatures passing 36C.

The Thai Meteorological Department warned that the storms will increase in their intensity in the coming days, particularly in North, the Northeast, the East, and the Central regions