The forest fire started at this location south of town on the evening of 01 May 2016.
Attached link with news item, video and photos. Fire start location shown in aerial photo (picture #10 of 12).
Second link (MODIS) shows progress of fire spread. Look at the archive to view dates & times.
On the evening of 03 May; the fire took a major run north into the residential areas of the City. As of the morning of 04 May; numerous houses and structures have been destroyed. Map at first link.
Forest Fire - Ft. McMurray Evacuation
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© Bing Maps
By KRL @ 2016-05-04 09:35:07
https://farm8.staticflickr.com/7744/26841849725_2846dc0bba_o.jpg