Howard County's health department has extended its heat advisory until 8 p.m. on Sunday, Aug. 14 as the heat index continues to climb.County officials said Friday that temperatures and humidity will make the heat index hit 105 degrees during the weekend.High temperatures increase the likelihood of heat-related illness, according to the National Weather Service.Residents should visit the county's 50+ Centers or Howard County Library branches during normal hours, which will act as temporary cooling sites.The health department has issued the following precautions:•Never leave children or pets unattended in a parked car or other hot environment.•Wear light-colored, light-weight and loose clothing along with a hat and sunscreen.•Remain hydrated and avoid drinks with caffeine.•Stay out of the sun between 10 a.m. and 3 p.m.•Check on elderly friends, family and neighbors.•Recognize signs of heat-related illness, including extreme weakness, muscle cramps, nausea, headaches, vomiting and dry red skin.Residents should call 911 if they encounter a heat related emergency.This story has been updated.