Kenshiro, while not having powered up, meaning that he is only using 30% of his strength, could easily harm
Jagi, who survived a nuke that
created an explosion that could be seen from space. When Ken powered up to 100%, he completely stomped Jagi, while Jagi could barely scratch Kenshiro's face
Years later, after Kenshiro meets Kaioh, who completely stomped 100% Mode Kenshiro and people comparable to 100% Mode Ken, while he was in base. After Kenshiro lifted the seals on Hokuto Shinken, he was able to match base Kaioh, who was noted as being stronger than last time, while he was in base. Eventually, both powered up to 100%, and Kenshiro eventually defeated Kaioh
Also, being able to blow away thick storm clouds, which have mass, at a very rapid speed, requires a massive amount of kinetic energy