Wahi a kekahi ʻōlelo noʻeau:

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"He 'ehu wawae no kalani."

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ʻO ka ua, ke ānuenue, a me nā hōʻailona ʻē aʻe i ʻike ʻia i ka manawa o kekahi aliʻi e noho ana ma ka ʻāina ʻē kekahi hōʻike o kona ʻike ʻia ʻana e nā akua.

"A trace of the heavenly one's footsteps." 

The rain, the rainbow, and other signs seen when a chief is abroad are tokens of his recognition by the gods. 
 

Eia nā ʻano ānuenue Hawaiʻi like ʻole .  E kaomi i kekahi kiʻi no ka ʻikena hou e pili ana i kēlā ʻano.

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Here are the types of Hawaiian rainbows.  Click on an image for more info about that type.