Myanmar meteorologist Dr Tun Lwin passed away at 6:57 pm on November 4, according to his family.
He had been admitted to hospital on October 19.
A former director general of Myanmar Meteorology and Hydrology Department he had objected to the Chinese-backed Myitsone dam project.
In 2008, he warned of the approach of the Cyclone Nargis, but his informal warning was ignored by Myanmar authorities.
Born in 1948 in Kula Village he grew up in Mandalay.