For the snow load you picture I doubt it's in much immediate danger... but if that snow got water laden or you got a good strong wind... all bets are off. I think what concerns me most about that barn is the general lack of proper bracing. A rafter can carry a lot of load in that configueration IF that post/purlin system doesn't start to twist and sway... but there isn't a lot there to prevent that. As a comparison here... a building that size would have a full 'W' truss with probably 2x8 or 2x10 top and bottom chords, spaced on a minimum of 4' centers, 2x10 or 2x12 wall plates and 2x4 strapping on the roof and walls at 16" and 2' respectively. IN addition there would be two knee braces on every truss and several runs of 2x4 above the bottom chords of the truss, end to end... as well as more diagonal corner bracing on the top chords towards the end of the building. This is clear span I'm talking about... but still probably 3 times the material. I'd also be concerned about the stains on some rafters. Leaks above there? Rotten wood? Nails?
As someone else suggested, it might be a good time to remove the valuables...
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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