Much of San Diego could hear some loud explosions this morning.
The U.S. Marine Corps Recruit Depot will be doing some training exercises at their base in the Midway area from 8:00 a.m. to noon.
It will feature some ceremonial cannon blasts, and warning messages played on a loudspeaker.
The sounds could be heard within a radius of up to 20 miles.
That's as far north as Solana Beach, as far south as the border, and as far east as El Cajon.