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Note: Referring back to the table above that lists the twenty lowest wind chill values on record for Atlanta, Georgia since 1960 (i.e., since the adoption of wind chill calculations by the NWS in Atlanta), the wind chill has been colder than -10✯ only 20 times. Like any other form of weather advisory, a Wind Chill Advisory is issued when life-threatening conditions are expected, but do not meet warning criteria. For an Advisory to be issued, there must be a high probability that wind chill values colder than 5✯ (5 above) will occur within the next 24 to 36 hours. Wind Chill Warnings are extremely rare in Georgia.Ī Wind Chill Advisory is much more common than either a Watch or Warning. The criteria for both a Watch and a Warning are the same except that a Warning means the event is imminent with a probability of occurrence greater than 80%.

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As always, a Warning is an upgrade from a Watch. In northern Georgia, a Wind Chill Watch is extremely rare we tend to see them more often in the northeast Georgia mountains than we do in metro Atlanta.Ī Wind Chill Warning is issued when there is an 80% chance or greater that the wind chill will fall below -10✯ within the next 12 to 36 hours. NWS Peachtree City Criteria for Issuing a Wind Chill Advisory or WarningĪ Wind Chill Watch is issued when forecasters at the NWS in Atlanta determine that there is at least a 50% chance for wind chills colder than -10☏ within the next 24 to 48 hours. Granted, the period of record isn’t as long as we’d like for it to be, but it is sufficient to provide some insight into the climatological ranges that we can expect for this part of the country: Date In the table below, I have included the top-20 coldest wind chill values that appear in the existing data record back to 1960. Using the data available since that date, the lowest wind chill value that I have found is -31.7✯ on January 21, 1985. For Atlanta, the earliest wind chill record appears to be January 1, 1960. However, it seems that the adoption by the National Weather Service of the wind chill concept was slow. The first wind chill equations based on actual physics have existed for over 70 years (1945). Return to the top What was the Lowest Wind Chill Ever Recorded in Atlanta, Georgia?

Windchill Calculation ( Fahrenheit and Celsius)Įnter in the air temperature (T air) in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to compute the windchill

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