I have been trying for years to control the weather in my workshops, and I have yet to be 100% successful. I do plan my workshops at times of the year that historically are the best times for photography, but as you can imagine it does not always work.
If we absolutely cannot shoot, I usually do classroom sessions or group photo editing sessions until we can get back out there.
Severe weather is just one of the many reasons I highly recommend that you purchase travel insurance.
You can read more about Travel Insurance on my blog.