Invisible enemies？

The Prime Minister always says "to protect the lives and safety of nationals".
Now, in this heat, patients with heat stroke are being delivered to the hospital every day. The number is unusual compared to the past few years. Obviously, I think that invisible enemies are beginning to attack the Japanese people.
As Japan participating in the Paris Agreement, I would like the Prime Minister to strongly appeal to the public that he emphasizes this situation.

"Heavy rain every once 50 years"?

The heavy rain caused by Typhoon No. 5 is falling in the Kyushu district.
The Meteorological Agency calls "heavy rain every once in 50 years" like every day. This way of saying may be a means of giving citizens awareness of heavy rain, but it seems like this is repeated every day, as if it were a story of a wolf boy.
Therefore, I think that the expression of "ragingly strong rain" is appropriate.
To the people, expressions that give fear should be avoided.