What do you mean the weather was fine that day?

Burning paper money is a memory of deceased relatives and a manifestation of spiritual information energy. Creatures can perceive your memories of them in other states. Although you didn't see or hear them, this kind of memory is only manifested in your heart and behavior.

Matter and spirit can be transformed into each other. As for how the spiritual information energy of matter is perceived by living beings in other States, it can be judged by our "heart". No matter what form of mourning expression is meaningful, it is the exchange of spiritual information.

As for the relatives who died in the underworld, they can actually be understood as being at a certain level in the spiritual universe. The spiritual universe and the material universe are holographic, so the communication is uninterrupted. The same is true of the exchange of spiritual information between human beings and the environment, which is also reflected in the philosophical thought of "the unity of man and nature" of the wise ancestor. As for "everything that catches fire on the dead goes to the underworld", then the "spirit" of the underworld seems to be materialized on the dead, right? So don't worry about "the sky is falling"