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Pattern Juggernaut June

GaWx

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1926-27 was a blowtorch warm, cold neutral to weak Nina blockbuster, does that count?

View attachment 20693
Atlanta officially got only 1" of snow, which is only 50% of average. This is just one example that shows that the correlation between ATL and NC for snowfall vs their respective normals isn't that strong.
 

J.C.

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Atlanta officially got only 1" of snow, which is only 50% of average. This is just one example that shows that the correlation between ATL and NC for snowfall vs their respective normals isn't that strong.
What is the best resource to find average snowfall totals? Was 2.9” for 1980-2010 for KATL?
 

GaWx

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What is the best resource to find average snowfall totals? Was 2.9” for 1980-2010 for KATL?
The 30 winters 1980-1 through 2009-10 averaged 2.6". However, the 30 years prior (1950-1 through 1979-80) averaged only 1.7" and the 30 years prior to that (1920-1 through 1949-50) averaged only 1.3". OTOH, the 30 years prior to that (1890-1 through 1919-20) averaged a whopping 3.3" due to a colder climate then as Febs especially were sig colder for some reason.

So, when you average out these four 30 year periods, you get an average for 1890-1 through 2009-10 of 2.2". So, it all depends on what period you choose to use. I think using longer than 30 years is wise due to high volatility. Furthermore, keep in mind that these numbers include sleet, which is a nontrivial portion. 1.0" Sleet accum is the equivalent of about 2.5" of snow. So, the 2.2" longterm average is likely equivalent to something closer to 2.7" or so. And I'm not even going to go into ZR, which is totally excluded in this analysis.

Also, the station was downtown ATL 1890-1 through 1933-4 followed by the further south airport 1934-5 through 2009-10. For 1890-1 through 1933-4 (downtown), the average was 2.6". From 1934-5 through 2009-10 (airport), the average was 2.1". But keep in mind that the winters were colder 1890-1912, largely due to Feb. So, some of the boost in 1890-1 through 1933-4 was colder winter related.
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Edit to add 2010-1 through 2018-9: average of 2.1", with about 0.25" of that 2.1" being sleet meaning the 2.1"/year is really equivalent to ~2.5". There was also sig. ZR in Feb of 2014, including major ZR on the southside and eastside of ATL.
 
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metwannabe

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Barring a miracle June will wrap up like this

High 97.0 29th
Low 52.5 15th
Average 76.1
Precip 4.87 .16 from 12th-30th


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5.13 for the month, if I go back to the night of 5/31 it's closer to 7.

Low of 50.2 don't know max as I still need to relocate my sensor (it shows 100, my guess is around 96 or 97)

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J.C.

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The 30 winters 1980-1 through 2009-10 averaged 2.6". However, the 30 years prior (1950-1 through 1979-80) averaged only 1.7" and the 30 years prior to that (1920-1 through 1949-50) averaged only 1.3". OTOH, the 30 years prior to that (1890-1 through 1919-20) averaged a whopping 3.3" due to a colder climate then as Febs especially were sig colder for some reason.

So, when you average out these four 30 year periods, you get an average for 1890-1 through 2009-10 of 2.2". So, it all depends on what period you choose to use. I think using longer than 30 years is wise due to high volatility. Furthermore, keep in mind that these numbers include sleet, which is a nontrivial portion. 1.0" Sleet accum is the equivalent of about 2.5" of snow. So, the 2.2" longterm average is likely equivalent to something closer to 2.7" or so. And I'm not even going to go into ZR, which is totally excluded in this analysis.

Also, the station was downtown ATL 1890-1 through 1933-4 followed by the further south airport 1934-5 through 2009-10. For 1890-1 through 1933-4 (downtown), the average was 2.6". From 1934-5 through 2009-10 (airport), the average was 2.1". But keep in mind that the winters were colder 1890-1912, largely due to Feb. So, some of the boost in 1890-1 through 1933-4 was colder winter related.
-------------------------------------

Edit to add 2010-1 through 2018-9: average of 2.1", with about 0.25" of that 2.1" being sleet meaning the 2.1"/year is really equivalent to ~2.5". There was also sig. ZR in Feb of 2014, including major ZR on the southside and eastside of ATL.
Thanks for posting all of this good information. I found an AJC article from 2017 that lists the seven greatest snowfalls from a place that has been recording since 1947 in Cobb near Acworth.

1. 15" March 13th, 1993
2. 10.5" January 22nd, 1987
3. 10" December 8th, 2017
4. 7" January 10th, 2011
5. 5.5" January 25th, 1991
6. 5" February 14th, 1960
7. 4.5" January 1st, 1964

If you just take the 72 years since 1947, and those 7 snowfalls, Cobb averages .8" per year since that time. Atlanta has only ever had one snowfall reach 10" I believe, and it wasn't from any of the above storms. There is no way to know the average without knowing the totals from every single year, but comparing Atlanta's greatest snowfalls to Cobb's, Cobb would average .5"-1" more per year one would think.

AJC
 

GaWx

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I expect to get my toosh OUTSIDE walking this evening for the first time in nearly a month! Dewpoints here are in the mid 50s with temps in the low 80s. Hard to beat for mid-June and it could easily be til Sep before seeing that combo again!
Bump to show that there were unusually comfy (for mid June) dewpoints in the mid 50s even way down here last year at this time...so even lower than the upper 50s we may attain within the next few days.
 
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