Two days of strong winds and storms and you've just dumped sieverts on most of the central US and Canada.

2 days and ~90% of the original radiation is gone. 3 days and it's ~97%.

10% of the radiation of something with a half life measured in hours in a lot od radiation.

10 tons of radioactive Na leak.

1 ton is left after 2 days.

Thats a lot!