Ahi is another name of the Vritra, mentioned in the Vedas.
Ahi is the demon of drought. He takes the form of a huge snake. The meaning of
the term Ahi is cloud formation or water vapor.
Ahi is continuously in war with Indra, the king of Devas and
the Vedic god of thunder and rain.
Ahi is perhaps the personification of drought. There might
have been long period of severe droughts. All living beings would have suffered
a lot. To overcome the drought they might have propitiated Indra. The rains
might have arrived after a certain period of time ending the drought and
suffering.