By the cities he means those cities mentioned Genesis 19:25, Sodom and Gomorrah; by the cry in the morning and shouting at noon, he means the shouts and noises that enemies make when they break in upon a place in a hostile manner.
Related Commentaries of Jeremiah 20:16
Jeremiah 20:16
16 And let that man be as the cities which the LORD overthrew, and repented not: and let him hear the cry in the morning, and the shouting at noontide;