This chart gives tips on what to watch for as hot weather persists in the Treasure Valley.

ONTARIO -- The National Weather Service is mincing no words in grabbing the public's attention about the current heat wave.

"The hot temperatures will create a DANGEROUS SITUATION in which heat illnesses are likely," the service said in its warning.

The heat warning is in place through Friday night, with temperatures forecast to go as high as 107.

"Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors," the service advises.