PINELLAS COUNTY, Fla. \- In an afternoon briefing, Pinellas County officials urged residents in Evacuation Zones A, B, C, mobile homes, and those with special medical needs to evacuate immediately if they have not done so already. The mandatory evacuation order affects more than 500,000 residents across the county. To accommodate the increasing number of evacuees, Pinellas County opened two additional emergency shelters at Melrose Elementary (1752 13th Ave. South, St. Petersburg) and Belleair Elementary (1156 Lakeview Road, Clearwater), bringing the total number of shelters to 10. Special need…