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