MACON, Georgia (41NBC/WMGT) — Installation is underway on new and upgraded outdoor emergency sirens across Macon-Bibb County. The nearly $3 million project will upgrade the county’s tornado and severe weather warning system using voter-approved Special Purpose Local Option Sales Tax funds. According to Macon-Bibb County, crews will replace wooden poles and equipment at 56 existing siren locations with new 50-foot concrete poles and updated equip…