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NWS Atlanta

Mar 10 • 6 tweets • 4 min read

🧵WEEKEND WEATHER: We've got some big changes coming up for the weekend, so get ready! We'll start with a severe weather threat Friday night followed by windy and much colder conditions Saturday and very cold temperatures Saturday night into Sunday morning. #gawx

⚡️Severe Storms Possible Friday Night⚡️ The risk for severe thunderstorms increases Friday night into pre-dawn Saturday along and south of the I-85 corridor ahead of the incoming strong cold front. The highest risk will be in Central Georgia. #gawx

🥶🥶Much colder air will arrive behind the front on Saturday, with temperatures remaining in the 30s and 40s for many of us. High temperatures will occur in the morning with temperatures dropping or steady through the day. Very gusty winds will keep wind chills even colder. #gawx

With the arrival of the cold air, there will be a chance for some snow❄️across portions of north GA on Saturday morning. Some light accumulations are possible in parts of NW/far north GA with rain/snow mix or light snow (no accumulation) as far south as the ATL metro. #gawx

🌬️🌬️As previously mentioned, NW winds will also be very strong on Saturday at 20-30 mph with some gusts over 40 mph possible. These gusts could will likely down some trees and blow around loose objects. #gawx

🥶Finally, a hard freeze will occur Saturday night into Sunday morning which will damage or kill any sensitive vegetation. Wind chills will dip as low as the single digits in the mountains with teens in the remainder of north GA and low 20s in Middle GA. #gawx

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More from @NWSAtlanta

NWS Atlanta

@NWSAtlanta

Jan 5

With KJGX radar going down for refurbishment, radar is on our mind! So lets talk about something we get asked about a lot; what is this hole in the radar over the radar location? To answer, we need to learn a little bit about how radar works, and use some *gasp* math! (1/7) #gawx

Radar sends out electromagnetic waves in order to detect objects. At the most basic level, waves are generated by the dish, the waves travel out, hit objects and scatter, and then some amount returns back to the radar, which we can measure. (2/7)

You can think of this as the radar "shouting" and then "listening" for a return echo. So the radar has to do two things before listening - first shout (send out the waves), then switch modes to "listen" for the return. Our radar does this very fast - like, microseconds fast (3/7)