The storm knocked out the electricity, internet and phone lines around his office, leaving him sitting in the dark unable to monitor the disaster in real time.
After the storm, the military junta spent weeks refusing to let foreign naval ships enter the country, worsening what was already a humanitarian disaster.
Mr. Ahr Mahn, the newspaper editor, said that while the junta had told officials not to speak to reporters about the cyclone’s aftermath, Dr. Tun Lwin did so anyway. “He was being pressured not to talk, but he didn’t care,” he said.
Dr. Tun Lwin retired after resigning from the government in 2009, six years before the junta allowed Myanmar’s first free elections in a quarter century. But he kept busy, making regular forecasts through his Facebook page and consulting for the Myanmar Red Cross Society and several nonprofits.
He spent much of his retirement warning that natural disasters linked to climate change were the biggest threat to the country’s development. In 2010, he created a website, Myanmar Climate Change Watch, to monitor erratic weather.
He is survived by his wife, Daw Mu Mu Than; a son, Zwe Mahn Tun Lwin; two daughters, Dr. Myat Su Tun Lwin and Swan Yay Tun Lwin; and three grandchildren.
Dr. Tun Lwin’s last days were documented by the Myanmar news media. and videos of him in the hospital received hundreds of thousands of views on Facebook. Some showed him reciting weather forecasts while he appeared to be sleeping.
His death left some people concerned for their safety.
“I never met him in person, but he feels like family, because I can sense his benevolence for our country,” U Kyaw Soe, a river delta farmer, said by phone. “Now who will warn us about storms and climate change?”
Saw Nang reported from Mandalay, Myanmar, and Mike Ives from Hong Kong.
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