Extreme heat will pose a hazard across much of north and central Georgia Thursday, with heat index values topping 100 degrees and reaching as high as 106 degrees in parts of northwest Georgia. A Heat Advisory remains in effect for portions of northwest Georgia until 8 p.m., while isolated thunderstorms are also possible in east-central and far northeast Georgia.
The National Weather Service issued a hazardous weather outlook for north and central Georgia for Thursday, September 3.
Weather reports can be packed with unfamiliar terms. Our plain-English guide to understanding weather reports explains what they mean—and what you should pay attention to.
What is in the Hazardous Weather Outlook?
The hazardous weather outlook states the following:
427 AM EDT Thu Sep 3 2026
This Hazardous Weather Outlook is for north and central Georgia.
.DAY ONE…Today and Tonight…
Heat index values are forecast to exceed 100 degrees across
central and portions of north Georgia this afternoon. A Heat
Advisory is in effect for portions of northwest Georgia until 8
PM EDT for heat index values as high as 106 degrees. Please
exercise caution if spending extended time or doing strenuous
activity outdoors.Isolated thunderstorms will be possible this afternoon in portions
of east-central Georgia and in the mountains of far northeast
Georgia..DAYS TWO THROUGH SEVEN…Friday through Wednesday…
Afternoon thunderstorm chances will gradually increase on Friday
for parts of the area, then increase further over the weekend.Heat index values will exceed 100 degrees for much of the area
Friday through Sunday and may reach hazardous levels for some.
Counties included in the alert
- Baldwin
- Banks
- Barrow
- Bartow
- Bibb
- Bleckley
- Butts
- Carroll
- Catoosa
- Chattahoochee
- Chattooga
- Cherokee
- Clarke
- Clayton
- Cobb
- Coweta
- Crawford
- Crisp
- Dade
- Dawson
- DeKalb
- Dodge
- Dooly
- Douglas
- Emanuel
- Fannin
- Fayette
- Floyd
- Forsyth
- Gilmer
- Glascock
- Gordon
- Greene
- Gwinnett
- Hall
- Hancock
- Haralson
- Harris
- Heard
- Henry
- Houston
- Jackson
- Jasper
- Jefferson
- Johnson
- Jones
- Lamar
- Laurens
- Lumpkin
- Macon
- Madison
- Marion
- Meriwether
- Monroe
- Montgomery
- Morgan
- Murray
- Muscogee
- Newton
- North Fulton
- Oconee
- Oglethorpe
- Paulding
- Peach
- Pickens
- Pike
- Polk
- Pulaski
- Putnam
- Rockdale
- Schley
- South Fulton
- Spalding
- Stewart
- Sumter
- Talbot
- Taliaferro
- Taylor
- Telfair
- Toombs
- Towns
- Treutlen
- Troup
- Twiggs
- Union
- Upson
- Walker
- Walton
- Warren
- Washington
- Webster
- Wheeler
- White
- Whitfield
- Wilcox
- Wilkes
- Wilkinson
What is the heat index?
The NWS defines the heat index as follows on its website:
The heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature. This has important considerations for the human body’s comfort. When the body gets too hot, it begins to perspire or sweat to cool itself off.
Chart from NOAA showing relationship between relative humidity and temperature in heat index
What is meant by “isolated” and “scattered”?
The NWS defines “isolated” as follows:
A National Weather Service convective precipitation descriptor for a 10 percent chance of measurable precipitation (0.01 inch). Isolated is used interchangeably with few.
“Scattered” has the following definition:
When used to describe precipitation (for example: “scattered showers”) – Area coverage of convective weather affecting 30 percent to 50 percent of a forecast zone (s).
Isolated thunderstorms and scattered thunderstorms are two terms used to describe different distributions of thunderstorm activity within a particular area. The main difference lies in the extent of coverage and how the thunderstorms are spatially distributed:
- Isolated Thunderstorms:
· Isolated thunderstorms are relatively rare occurrences that happen sporadically and are generally confined to a limited area.
· These thunderstorms are often characterized by being few and far between, with significant gaps between individual storm cells.
· Typically, isolated thunderstorms cover less than 20% of the forecast area.
· Despite their isolated nature, these storms can still be intense and may produce heavy rain, lightning, gusty winds, and possibly hail.
- Scattered Thunderstorms:
· Scattered thunderstorms are more widespread than isolated thunderstorms and cover a larger portion of the forecast area.
· In a scattered thunderstorm scenario, numerous individual thunderstorms develop, but they are not continuous or widespread enough to be classified as a “line” or “cluster” of storms.
· Scattered thunderstorms generally cover between 30% to 50% of the forecast area.
· Although scattered thunderstorms are more widespread, they still leave considerable gaps between storm cells, and not everyone within the forecast area will necessarily experience a thunderstorm.
In summary, isolated thunderstorms are fewer in number and more localized, covering a smaller area with significant gaps between storms, while scattered thunderstorms are more widespread, covering a larger area with numerous individual storms occurring somewhat randomly across the forecast area.
About the National Weather Service
The National Weather Service (NWS) is a federal agency within the National Oceanic and Atmospheric Administration (NOAA), part of the U.S. Department of Commerce. Its primary mission is to provide weather, water, and climate data, forecasts, and warnings to protect life and property and to enhance the national economy.
Headquartered in Silver Spring, Maryland, the NWS operates through a network of six regional headquarters and more than 100 local Weather Forecast Offices (WFOs) across the country. These offices issue weather forecasts, warnings, advisories, and watches tailored to specific geographic areas.
Metro Atlanta is served by the National Weather Service’s Atlanta/Peachtree City Weather Forecast Office, located in Peachtree City. The office issues forecasts, watches, warnings and other weather information for much of north and central Georgia, including Cobb County.
The NWS also runs specialized centers, including the Storm Prediction Center (SPC) for severe weather outlooks, the National Hurricane Center (NHC) for tropical storm tracking, the Weather Prediction Center (WPC) for national forecast guidance, and the Space Weather Prediction Center (SWPC) for solar activity that may affect Earth-based systems.
NWS forecasts and alerts are based on data from a combination of satellites, radar systems, weather balloons, surface observation stations, and computer models. The agency collaborates with emergency managers, broadcasters, government agencies, and the public to ensure that timely and accurate information is disseminated during weather events.
Its services are made available to the public at no cost, and its warnings—such as tornado warnings, flash flood alerts, and winter storm advisories—serve as official guidance for public safety and emergency response.
Editor’s note: AI was used in the production of this article. To read about when and why we made use of AI, read our article “How, When and Why the Cobb County Courier uses AI.”