JERUSALEM — The Israeli military on Monday called on residents of southern Lebanon to immediately evacuate homes and other buildings where it claimed Hezbollah stores weapons and said it was carrying out “extensive strikes” against the militant group.

It was the first warning of its kind in nearly a year of steadily escalating conflict and came after a particularly heavy exchange of fire on Sunday. Hezbollah launched around 150 rockets, missiles and drones into northern Israel in retaliation for strikes that killed a top commander and dozens of fighters.