Synonyms for heat wave

Claire was horrified at the effect of this heat wave on Sophie Blake.

A third kind of wave which goes forth in the ether from the spark gap of our coil is a heat wave.

Because, five weeks later, there was a heat wave in the Red Sea, and everybody took off all the clothes they had.

May's glowing sun, shining through the scantily covered branches, made dancing motes of heat wave above the surface of red clay.

Here we were in the middle of a heat wave, the thermometer nudging ninety, and the old guy's wrist is like an icicle!