Source: The Great Interpretation of Dreams (Ibn Sirin)
A thunderbolt in a dream is torment from the ruler or a debt. If it burns something, it is damage to property. If it kills, it is death upon sin.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A thunderbolt indicates sudden bad news. It may indicate a sudden illness.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A thunderbolt is interpreted as torment. Whoever sees it strike a place, torment will befall it.