Global National: Aug. 17, 2023 | Canadian Forces deploying aircrafts to aid with NWT fire evacuation

In tonight's top story: A fast-approaching wildfire has prompted an evacuation order for all of Yellowknife, which has the city's more than 20,000 residents rushing to get to safety. Jayme Doll is at the scene and looks at the long lines of people waiting to leave.

On the other end, Heather Yourex-West reports on how Alberta is stepping up to help evacuees, how communities are already filling up and the anxiety over what displaced people will return home to.

Plus, Farah Nasser speaks with Mayor Rebecca Alty to find out how she's feeling, about what the Canadian military is doing to help, the evacuation efforts and her plea to people who insist on staying behind.

Meanwhile, several new evacuation orders and alerts are being issued across British Columbia, as officials warn this could be the most challenging stretch yet of the province's wildfire season. Global News meteorologist Kristi Gordon explains how the situation became so dire and what's expected in the forecast.

Over in Hawaii, as emergency crews sift through the ashes of what's left in Lahaina, people are returning to their fire-ravaged community. Neetu Garcha reports from Maui about the fears of an impending economic crisis, the mixed messages to tourists and the hope to rebuild.

And, The United Nations recently said the world has entered a new era of "global boiling" as 2023 is on track to becoming the hottest year on record ever. Frequent weather warnings and alerts are raising a burning question: What does extreme heat to do to our bodies? Jeff Semple went to the lab to find out.