Asia just had a deadly heat wave, and scientists say it could happen again. Here's what's making it much more likely.

Hundreds of people died across Asia in recent weeks as the region sweltered under blistering temperatures. And a new study determined a leading factor in how it all happened. 

Last month, many areas in India saw temperatures well above triple digits. The country's meteorological service says that heat waves are not uncommon between March and June, with May being the "peak month" for the extreme weather event. In Bhagdora, India, last month, temperatures hit nearly 115 degrees Fahrenheit as the India Meteorological Department issued a red alert warning, meaning that severe heat was expected to persist for more than two days and there was a very high likelihood for heat-related illnesses. 

Elsewhere in the country, it was so hot that schools were canceled, an issue that people also faced in the Philippines. People in Thailand were also asked by officials to stay indoors when possible to avoid the heat, as dozens of people had already died from heat-related illnesses. According to the Associated Press, the April heat killed at least 28 people in Bangladesh, five in India and three in Gaza.