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Old Jan 7, 2025 | 2:13 pm
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emma dog
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Read the latest NWS discussion for ATL Friday midday into Saturday. ATL is really on the knife's edge for issues. I-20, which runs through downtown, is the dividing line between ice and a rain/light snow mix. Highlights from the NWS:
Models are honing in on what would be an impactful winter weather event across much of northern Georgia, including metro Atlanta, on Friday. .... This will bring precip and the potential for winter weather across wide swath of the south, including our CWA.

Into the metro and along I-85, including Athens, things get a lot more uncertain. A bit of an "in-situ" wedge may be able to set up, with cold air in place being pushed up against the Appalachians as the low passes to the south. This creates a little uncertainty in the models as to surface temperatures.

....South of I-20, uncertain if we can remain below freezing during the day on Friday. Current forecast would see a transition to rain that would likely occur before any meaningful accumulation of snow or other icy precip could occur...System begins to clear the area by Saturday morning. Cold air will settle back in. Some uncertainty on high temperatures, especially across northern Georgia, as snowfall accumulation is likely to have impacts models may not fully realize. Have chosen to mix in a little bit of the NBM 10th percentile in these areas to bump highs down. Either way, many areas that could see impactful accumulations of snow or ice will likely see only a few hours at most above freezing, meaning untreated or unplowed roadways are likely to see refreeze Saturday night as temperatures drop well into the teens and 20s.

Translation for those not from round these parts: It could be not-so-bad for airport ops, but maybe it will be bad because of ice and freezing rain. However, ops might be impacted by flight crew ability to make it in if the roadways get iced over, and the airport experience might be rough if MARTA goes down from the ice. I'm surprised they haven't issued a weather waiver yet, even if it's just to reduce people's anxiety.
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