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Pattern December to Remember
- Thread starter SD
- Start date
Avalanche
Member
Looked down south of here and sure enough, storms.
Min: 25.2
Max: 74.7
Avg: 49.8
Precip: 1.87
Max: 74.7
Avg: 49.8
Precip: 1.87
Min 25.7
Max 77.4
Avg 50.7
Rain 3.39
Snow 0.00
Max 77.4
Avg 50.7
Rain 3.39
Snow 0.00
So needless to say, 2021 was the warmest December on record for DFW.
But just to show how unprecedented it was:
*1st December ever to end with a monthly average greater than 60°F (61.3°F to be exact).
*Previous record for warmest December was shattered by a whopping +7.3 degrees.
*1st December ever to end with a positive double-digit departure from average (+13.2 degrees to be exact).
*1st December ever to end with an average high greater than 70°F (72.6°F to be exact).
*The previous record for highest December average high was shattered by a whopping +6.7 degrees.
*1st December ever to end with an average low of at least 50°F (50°F to beexact).
*Previous record for highest December average low was shattered by a whopping +6.6 degrees.
*Grand total of only 1 freeze (with a low of only 32°F to be exact)
*Grand total of only 1 day with a sub-50°F high (48°F to be exact).
*Total of 23 days (yes, you read that correctly) with a high of 70°F+
*Total of 8 days with a high of 80°F+
*Warmest Christmas day on record, with a high of 82°F (breaking the previous record of 80°F from 2016).
*Ended with a 9-day consecutive streak of 70°F+ highs.
This was all driven by a number of combined factors, including widespread moderate/severe drought conditions across the Southern Plains, an unusually deep -PNA (deepest in at least 16 years), and the MJO which only slowly progressed through two phases (6 & 7) that were favorable for warmer than normal tempertures in Texas.
But just to show how unprecedented it was:
*1st December ever to end with a monthly average greater than 60°F (61.3°F to be exact).
*Previous record for warmest December was shattered by a whopping +7.3 degrees.
*1st December ever to end with a positive double-digit departure from average (+13.2 degrees to be exact).
*1st December ever to end with an average high greater than 70°F (72.6°F to be exact).
*The previous record for highest December average high was shattered by a whopping +6.7 degrees.
*1st December ever to end with an average low of at least 50°F (50°F to beexact).
*Previous record for highest December average low was shattered by a whopping +6.6 degrees.
*Grand total of only 1 freeze (with a low of only 32°F to be exact)
*Grand total of only 1 day with a sub-50°F high (48°F to be exact).
*Total of 23 days (yes, you read that correctly) with a high of 70°F+
*Total of 8 days with a high of 80°F+
*Warmest Christmas day on record, with a high of 82°F (breaking the previous record of 80°F from 2016).
*Ended with a 9-day consecutive streak of 70°F+ highs.
This was all driven by a number of combined factors, including widespread moderate/severe drought conditions across the Southern Plains, an unusually deep -PNA (deepest in at least 16 years), and the MJO which only slowly progressed through two phases (6 & 7) that were favorable for warmer than normal tempertures in Texas.
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L
Logan Is An Idiot 02
Guest
Was this a top 3 warmest December for CLT?
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
It was #3 with only 2015 and 1889 warmer. Kudos! Dec was 3.8 warmer than Nov, the largest warming Nov to Dec on record. That largest warming was also the case at RDU and SAV. ATL and RDU also had the 3rd warmest Dec with SAV 4th.
We’re now setting ourselves up for possibly one of the biggest coolings from Dec to Jan with the help of a large PNA rise from near record -PNA Dec and a move toward perhaps 8-1-2 low amp MJO. What would make that even more likely is if we could get -AO and/or -NAO to return.
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Yes sir it was… great job calling that early. Obviously these last several days of not dropping below 60 at night had a huge impact on it.
L
Logan Is An Idiot 02
Guest
Thank you! Yes that did have a huge impact. March will deliver.
Sent from my iPhone using Tapatalk
Precipitation: 4"
KATL: 3rd warmest officially I believe.
It is now official per NCEP as expected: the December of 2021 -PNA is a December record going back to 1950, easily beating 1955. Also, the drop in PNA from Nov to Dec is easily a record.
Was it a record -PNA for ANY month? Not quite as Sep of 1986, April of 1954, and May of 1964 beat it. So, December of 2021 comes in as the 4th most negative PNA of the 864 months since January of 1950 and THE most negative for any winter month:
So, if one were wondering if it were really as ugly as it seemed on day after day after day of model runs last month, this sort of confirms that it was about as bad as ever.
Edited twice for correction
Was it a record -PNA for ANY month? Not quite as Sep of 1986, April of 1954, and May of 1964 beat it. So, December of 2021 comes in as the 4th most negative PNA of the 864 months since January of 1950 and THE most negative for any winter month:
So, if one were wondering if it were really as ugly as it seemed on day after day after day of model runs last month, this sort of confirms that it was about as bad as ever.
Edited twice for correction
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