LENOX, Mass. — Richard Wagner put an obsessive amount of effort into portraying the natural world in the “Ring,” both in his music and how he wanted it staged. Rivers run and rainbows shine in “Das Rheingold.” Forests rustle and murmur in “Siegfried.” And in “Die Walküre,” the second of the four “Ring” dramas, storms howl and rage.

Real storms, if you were at Tanglewood, the Boston Symphony Orchestra’s summer home in the Berkshires here, on Sunday. As the Valkyries saddled up and the conductor, Andris Nelsons, settled down to open the third act of a perfectly solid concert performance of “Die Walküre” that stretched over two days, a mighty thunderclap crashed around the hills with impeccable timing and grandeur.

Not that the performers in this “Walküre” needed much help bringing the atmosphere — they needed more help bringing an audience to Tanglewood’s Shed, which was rather sparsely attended over the weekend. One or two Valkyrie helmets patrolled the grounds, but Wagnerians seem on the whole to have stayed away from this second step, two years after “Das Rheingold,” toward what we can hope eventually becomes a complete “Ring” from these forces.