LAMAT

The Aliens of Lamat is a fiction story yet I find things that speak of it being real on wikipedia.

On August 28 2012.

Kukulkan always travels ahead of the Yucatec Maya rain god Chaac, helping to predict the rains as his tail moves the winds and sweeps the earth clean.[16]

Among the Lacandon Maya of Chiapas, Kukulkan is an evil, monstrous snake that is the pet of the sun god.[7]

Chaac (also spelled Chac or, in Classic Mayan, Chaahk) is the name of the Maya rain deity. With his lightning axe, Chaac strikes the clouds and produces thunder and rain. Chaac corresponds to Tlaloc among the Aztecs.
Versions of this myth[3] show the rain deity Chac in his war-like fury, pursuing the fleeing Sun and Moon, and attacking them with his lightning bolts.

Rain
A large part of the most important Maya book, the Dresden Codex, is dedicated to the Chaacs, their locations, and activities. It illustrates the intimate relationship existing between the Chaacs, the Bacabs, and the aged goddess, Ixchel. The main source on the 16th-century Yucatec Maya, Bishop de Landa, combines the four Chaacs with the four Bacabs and Pauahtuns into one concept. The Bacabs were aged deities governing the subterranean sphere and its water supplies, corresponding to the Huaxtec Mamlab mentioned above.