Randy - Thank God your friend, and all others involved survived that massive field fire. When it covers that much ground, it likely also included some standing crops. As dry as it is in SD right now, the risk for field fires is extreme. I do wonder how the liability works, as the only ones I've seen were started by farm machinery. Again., thank goodness everyone involved is ok...........
I can attest to how scary they are. Northern Alberta's climate is considered arid, so fall harvest almost always has a few stretches of high risk for field fires. in 2013, we set up for an afternoon waterfowl hunt in the middle/east side of a 1/2 section wheat field, that was 90% combined. Winds were strong out of the west, and our friend Gary was combining the last 30-50 acres on the west end. it had been a wetter than normal summer, so the stubble and tailings were thick. We started seeing smoke from where the combine was, and then fire. it spread rapidly, and quickly spread N-S as it burnt the field from west to east. Your first thought is - is Gary ok - and your second thought is, we need to get the hell outta here! We tore down the blind, grabbed as many decoys as we could, loaded up the truck, and left the field. Another friend showed up with a tractor & disc, cutting a fire break on the west side of the field. the real savior was the field butted up to a road, so as long as the embers didn't jump the road, the fire was done - which is what happened. we lost nine or so goose decoys - just ran out of time to grab everything - and Gary (and his combine) were safe - most importantly. It turns out his combine spun a bearing, which caused sparks that ignited the field. I've witnessed 4 field fires up there, very frightening and lives are truly at risk. The smoke is very dangerous as well.
Just a mile from our house there was a small 20 acre field fire (contained to 20 acres) Friday night & fortunately nobody was hurt. Sadly, it did burn up a Steiger 550 Hydrotrac
Here's a few pics from the Alberta field fire