LovingGulfLows
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KATL had snow mixed with the rain 9:25-10:40 per this but 5 warmer than NE ATL I suspect due to prevailing S to SE winds (see below) that PDK didn't have as their winds were mainly calm not allowing warmer air to move in. I think that made the diff rather than heat island. I'm still looking for any past S/IP accum at KATL with S prevailing winds and haven't found yet: 08 Feb 10:40 am 37 34 87 ESE 6 5.00 Lt Rain, Lt Snow, Mist BKN024,OVC032 29.14 30.25 0.06 08 Feb 10:35 am 37 34 87 SE 5 5.00 Lt Rain, Lt Snow, Mist BKN024,OVC032 29.14 30.25 0.06 08 Feb 10:30 am 37 34 87 SE 7 5.00 Lt Rain, Lt Snow, Mist BKN024,OVC032 29.14 30.25 0.05 08 Feb 10:26 am 37 33 85 SSE 5 3.00 Lt Rain, Lt Snow, Mist BKN024,OVC032 29.15 30.26 0.05 08 Feb 10:25 am 37 34 87 S 5 5.00 Lt Rain, Lt Snow, Mist BKN024,OVC032 29.15 30.26 0.04 08 Feb 10:20 am 37 32 81 SSE 8 4.00 Lt Rain BKN020,OVC032 29.15 30.26 0.04 08 Feb 10:16 am 37 33 85 S 7 3.00 Lt Rain, Mist BKN020,OVC032 29.15 30.26 0.04 08 Feb 10:15 am 37 34 87 S 7 4.00 Lt Rain, Mist OVC022 29.15 30.26 0.03 08 Feb 10:10 am 37 32 81 S 8 5.00 Lt Rain OVC022 29.15 30.26 0.03 08 Feb 10:05 am 37 32 81 S 7 4.00 Lt Rain OVC022 29.14 30.25 0.03 08 Feb 10:00 am 37 32 81 SSE 6 4.00 Lt Rain OVC022 29.13 30.24 08 Feb 9:55 am 37 32 81 SSE 6 4.00 Lt Rain OVC022 29.13 30.24 0.01 08 Feb 9:52 am 37 32 82 S 6 4.00 Lt Rain OVC022 29.13 1024.9 30.24 0.04 0.04 08 Feb 9:50 am 37 32 81 S 5 4.00 Lt Rain OVC022 29.13 30.24 0.04 08 Feb 9:45 am 37 30 75 SSE 5 4.00 Lt Rain, Lt Snow OVC020 29.13 30.24 0.03 08 Feb 9:40 am 37 30 75 N CALM 4.00 Lt Rain, Lt Snow OVC020 29.13 30.24 0.03 08 Feb 9:35 am 37 30 75 N CALM 6.00 Lt Rain, Lt Snow OVC020 29.13 30.24 0.02 08 Feb 9:30 am 37 30 75 SSW 5 6.00 Lt Rain, Lt Snow OVC020 29.13 30.24 0.01 08 Feb 9:25 am 37 30 75 SSW 6 6.00 Lt Rain, Lt Snow OVC020 29.13 30.24 0.01
I think it was a combination of Southern winds and the in-situ CAD that was in place prior to the start of the precip. Someone posted a map of the wetbulb temperatures where you can see this. It was below freezing in the north and east metro areas and above freezing in the south and west metro areas. Some of the model runs last night had taken notice of this hence why it was trending poorer for the western parts of the Atlanta area.
This was a map about an hour or two before the start of the precip in the central Atlanta area. Quite frankly, it's bizarre to see a temperature gradient look like this(most o the time when you do, it's because of a strong CAD in place). Usually, the freezing line SW to NE or W to E.