Volusia and Flagler counties as well as several other Central Florida counties were under a heat advisory through 6 p.m. Friday, July 18 — something forecasters with the National Weather Service in Melbourne expect to continue through the weekend.
Temperatures are not unusually high in the area for this time of year — highs will get close to 93 degrees in Volusia and 95 in Flagler. But a combination of weather factors has pushed heat index values to about 109, prompting the advisory.
“Temperatures are reaching low to mid 90s,” said Derrick Weitlich, a meteorologist with the National Weather Service in Melbourne. “That’s not unusual, but we also have some additional abnormally high humidity across the area.”
That combination, he said, makes the heat index rise.
“Another added impact is, we are not expecting high rain chances today,” which will prolong the heat, Weitlich said.
Average temperatures for the summer months (June, July and August) in Volusia County range from the high 80s to low 90s, he said.
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Weitlich said the 6 p.m. deadline for Friday won’t be extended, but other heat advisories over the next few days “will likely be needed.”
“It looks like the heat and humidity will only continue to increase into the weekend,” he said.
What does a heat advisory mean?
Heat advisories are issued when the heat index passes the 105 degree mark, according to the NWS.
“The heat index . . . is what the temperature feels like to the human body when relative humidity is combined with the air temperature,” according to the agency’s website.
Graphic shared by the National Weather Service in Melbourne’s Facebook page warns to risks of heat-related illnesses and how to keep safe.
On Friday, Volusia and Flagler counties were seeing humidity levels around 84% and 70%, respectively.
These conditions could make it dangerous for residents to spend time outside if they’re not aware of the risks.
How to keep safe during a heat advisory
When the heat index goes up and heat advisories are issued, there are several safety tips to help avoid heat-related problems.
Under such conditions, heat cramps or heat exhaustion is likely, as well as possible heat stroke with prolonged exposure and/or physical activity, according to the National Weather Service.
Those without effective air conditioning or hydration are at a greater risk for heat-related illnesses. Fans and open windows at night “will not be enough,” according to the agency.
Graphic shared by the National Weather Service in Melbourne’s Facebook page warns of potential signs and symptoms of heat exhaustion and heat stroke, possible under heat advisory conditions, and what actions to take in case people experience them.
“Make sure to take plenty of breaks, as often as possible, in air-conditioned buildings,” Weitlich suggested. “If you are at a job site, or anyone spending time outdoors, make sure to stay hydrated.”
Other precautions to take under heat advisories include wearing lightweight, light-colored clothing and avoiding strenuous outdoor activities during the warmest parts of the day.
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Heat exhaustion signs include dizziness, excessive thirst, heavy sweating, nausea and weakness. Those experiencing these symptoms should move to a cooler area, loosen their clothing and drink cool water.
If someone becomes unconscious after showing signs of heat exhaustion, it is likely that person is suffering heat stroke, which can cause death or permanent disability. Call 911 immediately.
This article originally appeared on The Daytona Beach News-Journal: Volusia, Flagler counties under heat advisory; what does it mean?