He'll be fine. I've lived in this region (North of Baltimore Md, South of Harrisburg Pa.) all my life. Pretty safe area. You can have a tornado or two during the summer from a severe thunderstorm. Wind shears happen more than tornados. Snow fall can be three to four feet at one time buts that's maybe once in five years if that. The Appalachian mountains close to the west of us really help to break up storm fronts. Compared to other parts of the country we're fairly lucky here.
Here's his video of the construction...
Yep, I watched that - and from what I know about building "pole barns" (I've tossed up a half dozen or so),
metal roofing sitting on wood stringers on the flat doesn't have much strength against snow load.
His using 6x6 posts for 14' eave heights + center peak is ok unless you're concerned about horizontal wind
loads, too. No way that design is rated for any sort of big wind shear.
If no extreme weather events occur, that building will be there for a long time; it's obviously pre-engineered
and looks great, if not a tad under-insulated.
If a good 90mph side wind comes along, though.... or if a big dump of wet snow comes along...
In comparison, my own garage ("pole barn", too, just modified) has open web steel joists, 6x6 posts on 10' eave
heights, OSB roof decking over insulation and under 50-year (heavier) metal roofing and steel angle iron spanning
every bay. Same metal on all sides, too. It doesn't dent easily, suffice to say.
It's rated for a 24" snow event and 160mph wind event.
Yeah, that's overkill. No, we haven't had a tornado here in 50 years (but they get in the area about the same
frequency as there, apparently). No, we don't get snow like that (most I've seen on the ground at once was just
shy a foot deep).
Don't care. It was built to protect.
Our garage IS our tornado shelter. Strap yerself to a column and hang on, Gertie!