How stormy (wave height) does Lake Baikal get?
An article here says 4 meters. (No statistical data however, just a general information page)


  Waves on Lake Baikal may reach a height of 4 meters. Sometimes they
  evaluated as 5 and even 6 meters, but it is most likely an estimation
  “by eye”, which has a large error. Height of 4 meters obtained by
  instrumental measurements on the high seas.




Another source, The Lakes Handbook: Lake Restoration and Rehabilitation
edited by Patrick O'Sullivan, C. S. Reynolds, (pg 179) agrees with this figure (emphasis mine):


  Baikal exhibits many features of an ocean: abyssal depth, internal
  waves and seiches, tides, violent storms in which wave-height
  reaches up to 4m, and deep water luminescence of uncertain nature.