Shooting stars, lightning and tornados prompt the recitation of Oseh Maaseh Beraishis.

The Mechaber rules that the same Bracha should be recited on thunder.

Mishna Berura writes that if one sees lighting and hears thunder one right after the other, only the Bracha of Oseh Maaseh Beraishis should be recited.

If thunder was heard without seeing lightning, a Bracha of Shecocho Ugevurasoh Malei Olam should be recited on the thunder. When the lighting is then seen, the Bracha of Oseh Maaseh Beraishis should be recited on the lighting.

Both Brachos would also be recited if the lighting is seen without the thunder being heard at that time, but was heard some time later.

Sharei Teshuva points out, that since the nature is for lighting to be followed by thunder, a Bracha should not be recited on thunder, if someone had in mind the thunder when reciting the Bracha on the lighting. However, it is best to recite a separate Bracha on the thunder.