Floods are one of Europe's most widespread disasters. Major flooding has occurred nearly every year somewhere on our continent during the last few decades.
Tornadoes are one of Europe's widespread disasters.
We know that floods are one of Europe's most widespread disasters, but we do not know what the others are.  So to say that Tornadoes are one of Europe's widespread disasters is either definitely correct nor definitely incorrect.
( z1 tornado :ARG1-of ( z2 include :ARG2 ( z3 disaster :location ( z4 continent :name ( z5 name :op "Europe" ) ) :ARG1-of ( z6 spread :ARG1-of ( z7 wide ) ) ) ) )