Here's something you can try. Buy a Dr. June's weather machine and upgrade it until you can the weather. Then change the weather to clear skies. That should get the T-storms to stop for a while. When it starts to T-storm again, just change the weather again.
The machine does reset whenever you travel so you will need to change the weather again when you get home again.
I know what you mean about having T-storms constantly. I haven't ever had it be as bad as you've described but I have had it T-storm for 42 out of 44 days in the spring, summer and fall in Brindleton Bay once before I figured out what the weather machine could do. It is not fun playing when the game does that. Since I figured it out, it hasn't happened again because I change the weather now in some worlds on a regular basis.
Hope this helps.
