BANGKOK, Dec. 29 (Xinhua) -- Various districts in Thailand's northern province of Chiang Rai were in pitch black after a hail storm hit northern Thailand Saturday night, local media reported on Sunday.
TV footage showed trees were felled by strong winds, blocking traffic several districts in Chiang Rai.
The Thai Meteorological Department (TMD) said the hail storm which struck Mae Sai, Chiang Saen and Mae Chan districts, lasted about 30 minutes and damaged several houses.
Local media reported that the relief operations by the northern provincial public disaster mitigation unit had been hampered by the power outage, which lasted hours before mechanics from the provincial electricity authority managed to restore the supply.
The TMD said on Sunday that the sudden storm was caused by the westerly wind current over the northern region.
The department warned that there might be rain or hail storms in some areas of Mae Hong Son, Chiang Rai and Chiang Mai provinces on Sunday night.