'Heat' in the Bible

and all these thy servants have come down unto me, and bowed themselves to me, saying, Go out, thou and all the people who are at thy feet; and afterwards I do go out;' -- and he goeth out from Pharaoh in the heat of anger.

And in the heat of my wrath I will put you to death with the sword, so that your wives will be widows and your children without fathers.

why do the Egyptians speak, saying, For evil He brought them out to slay them among mountains, and to consume them from off the face of the ground? turn back from the heat of Thine anger, and repent of the evil against Thy people.