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Mid to Long Range Discussion ~ 2022


buckeyefan1
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Guys I gotta say the GFS ENS has me salivating with the setup. If the strong block modeled around the 22nd/23rd can force the 50/50 underneath it there is no telling the fireworks that could go off in that setup. If it doesn’t eastern seaboard (maybe Philly north would look to cash in). It could easily happen so stay tuned. The 500 setup is about as good as you can get for an east coast snowstorm. 

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On 12/13/2022 at 1:34 PM, GaWx said:

 The latest GEFS forecast for AO implies a good chance for a ~-3 AO for 12/16-31. Since 1950 (assuming I didn't miss any), the only lower AOs for 12/16-31 were in 1950, 1976, 2000, 2009, and 2010. So, 2022 is aiming to have the 6th lowest AO for 12/16-31. 1995 was just above -3 and would be 7th lowest if this forecast holds. Since 2010, there have been none that were -2 or lower.

 What were the SE US temps and wintry precip for those 12/16-31s? I haven't checked that yet. If I get time, I'll look them up.

Followup as I just compiled the effects on RDU and ATL from the strongest -AOs averaged out 12/16-31 since 1950. 2022's 12/16-31 is per today's GEFS flirting with ending up with an average of near -3. Here are the strongest:

2009: -4.5

1950: -3.8

2010: -3.7

1976: -3.5

2000: -3.4

1995: -2.8

 So, 2022 is as of now aiming for 6th or 7th strongest 12/16-31 -AO since 1950. That would mean 92-93 percentile.

 How were these six last half of Decembers at RDU and ATL in terms of temperature anomaly, lowest temperature, and wintry precip?

1) RDU:

2009: 6 BN, 23, 0.2" SN/IP

1950: 9 BN, 13, 0.3" SN/IP, 0.41" ZR

2010: 8 BN, 19, 7.5" SN/IP, 0.47" ZR

1976: 6 BN, 9, 0.0" SN/IP

2000: 11 BN, 12, 0.1" SN/IP

1995: 8 BN, 18, 0.0" SN/IP

 

AVG 8 BN, 16, 1.4" SN/IP, 0.15" ZR

 

2) ATL:

2009: 5 BN, 27, T of SN/IP

1950: 6 BN, 18, 0.0" SN/IP, 0.77" ZR

2010: 5 BN, 23, 1.4" SN/IP

1976: 7 BN, 13, 0.0" SN/IP

2000: 13 BN, 13, 3.0", SN/IP

1995: 7 BN, 21, 0.0" SN/IP

 

AVG 7 BN, 19, 0.7" SN/IP, 0.13" ZR

 

What does this tell me about the last half of this month in the SE?

1. Cold to very cold most days very likely.

2. Good chance for RDU coldest to be teens and ATL coldest to be teens or low 20s.

3. Assume non-cold dominated operational runs not supported by ensembles are likely wrong.

4. Significant wintry precip hard to predict as is normal for the SE. One third of the analogs at RDU and half at ATL had significant. That's a larger % than the overall climo % for just the last half of December, which is intuitive since it is so cold. Thus the average wintry precip for the six analogs is well above normal for that period even though there could still easily be nothing significant or possibly none at all.

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That's a pretty substantial jump south on that run with the big northern stream wave next week. Definitely plenty of time to hopefully see that trend towards digging just a bit more. Maybe a longshot but the ensembles have continuously had at least a few members with a storm in this timeframe. 3BAC71AC-4A4F-48BA-A920-6C41B8F29AE7.thumb.gif.7ed32ad9f75156683fefab642c40b67f.gif

Perhaps even more interesting could be the subsequent piece of energy that wraps around that TPV lobe once it gets stuck under the block, the GEFS at 18z indroduced a lot more QPF around the 25th/26th, but only time will tell. 

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4 hours ago, Grayman said:

00 has a nice little storm for eastern and central NC on Dec 26 per gfs

 And this 0Z GFS storm is in reality actually almost all snow since 850s are all below 0C.  The southern part of this goes all of the way down to the FL/GA border! This is still way out in fantasyland and is thus mainly for entertainment as of now. However, this is about the third GFS run over the last few days showing SE coastal wintry precip. The 0Z 12/14 GFS also had a winter storm for the same timeframe that included the SE coast though it was mainly IP/ZR there (see 2nd image). This one, like that one, actually starts on 12/25 and thus would mean a white Christmas for many!

 

 

C9EB476B-F9B0-414E-99EB-A88508E91FA2.png
 

From 0Z 12/14 GFS run:

 

7B44A4D2-BA28-43E0-8814-3140597BF0A2.png
 

 This was the first one showing significant wintry precip for the coast (mainly IP/ZR with this from the 18Z 12/12 run for 12/27):

D139B2A4-93EF-4C91-A719-BF4E36CC6C61.thumb.png.2bb0935bd3863f45fb62cec0cfb86b40.png

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