Answer:
i personally would invest in a system called ATA which stands for Advanced. Tornado. Artillery. such a defense devise would prevent tornados all together using a mix of anti tornado shell and high explosive incendiary rounds. but naturally such tactics are against the GINIVA convention so our assaults would have to be covert most likely occurring during the night under the cover of darkness but our efforts would not be met without struggle causing the tornados to use gorilla tactics which resulting in high civilian casualties so in order to avoid such a tragic lose of life we would indulge in creating a small army dedicated to stopping these preemptive attacks by the tornadoes causing the enemy to face heave losses. with no other option but to retreat we will then send out a tactical team which will capture their leader destroying their moral to such an extent that they wont come within a hundred clicks of our location. the captured enemy leader would then be put in the gulag where he will be serving a life sentence of 300 years which in my opinion is too kind of a sentence but the courts wouldn't allow further punishment. after the dust has settled we would begin operation extermination where will plan our counter attack and put these nuisances down once and for all....
but hey thats just my opinion am sure a normal mayor would pick shelters which would probably work just fine :/