I don’t know about where you live but here in Europe there have been storms warnings with pretty strong winds in the last week. Not a meteorologist and I have no idea how that would impact radioactive dust spread.

Are the prevailing winds are typically West to East?

According to https://www.meteoblue.com/en/weather/historyclimate/weathera... they're blowing from the West to the East so it's blowing from Europe towards Pripyat, so at least there is that.