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January 2020 General Discussions & Observations Thread


Rtd208

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15 minutes ago, PB-99 said:

I am not going to post day 12 surface maps but the MJO into p7 supports the trough in the SE at the date I outlined yesterday.

 

Jan 25th or so.  But the GFS now has SLP at the BM, the key will be can this phase and the cold air win out. 

 

N branch was off by 18 hours. 

 

Just a time frame to watch. 

I'm sorry, but with that setup and track that's a snowstorm. Then again I'm not losing sleep over a day 12 GFS surface reflection. At this far out juncture I'm just looking for a consistent signal with all the major models.

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51 minutes ago, NutleyBlizzard said:

I'm sorry, but with that setup and track that's a snowstorm. Then again I'm not losing sleep over a day 12 GFS surface reflection. At this far out juncture I'm just looking for a consistent signal with all the major models.

 

The EPS takes the ULL and digs it into the OHV , which would get us home. The GFS over amplifies the N branch ( which it likes to do ) and drives it through the lakes and that would pull the heights back.

 

And I agree being 12 day away that`s why I just left it loose for now. 

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11 minutes ago, forkyfork said:

the longer range EPS doesn't look as cold as yesterday's runs did

Yep. We are loosing the -epo look and are left with +pna and split flow look. The reshuffle around the 25th could hurt temps around here. 
 

next week looks cold and dry

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6 minutes ago, forkyfork said:

like saturday's which is getting rainier with every run?

 

1 minute ago, Allsnow said:

Yep. We are loosing the -epo look and are left with +pna and split flow look. The reshuffle around the 25th could hurt temps around here. 
 

next week looks cold and dry

So now the pattern isnt going to change ? What is it ?

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Just now, rclab said:

Didn’t we have a recent memory cold season that had zero accumulation a but into March? As always....

I don't recall a winter like that.     Last year was close-but the biggest snow was in Nov, without that we would have gone close to snowless until the March events came...

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2 minutes ago, SnowGoose69 said:

That BAM posting was the misleading post of the century.  That’s the change in anomaly from the prior EPS run.  The actually anomaly shown by the EPS in that period is still entirely below normal in the east

 

Unreal. 

 

You don`t expect energy met`s in the private sector to that but when you claim winter is over 3 weeks ago, so I guess you better look for anything to help your story. 

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3 hours ago, Allsnow said:

Next Wednesday is definitely a good pattern for a southeast snowstorm. That would be fitting lol. Euro is very close for the southeast 

bad snow years always have some misses to the south., the north, and a great storm to early or to late in the season...

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Today saw a continuation of warmer than normal weather. The generally warmer than normal conditions will likely persist through Friday. However, a more winter-like pattern lies ahead in the medium-term.

During the coming weekend, colder air will likely return for a period. There is potential for the temperature to fall into the teens even in New York City. Afterward, even as moderation should follow for a time, the cold will likely return during the closing week of the month. At that point, the cold could become sustained and continue into at least the start of February.

On Friday night and Saturday there is potential for a system to bring New York City and Newark its first measurable snowfall since January 6. Philadelphia could receive its first measurable snowfall since December 11. At present, this continues to appear to be the kind of storm that could bring 1"-3"/2"-4" to Philadelphia to New York City, more to the north and west, including New England, and less to the south and east.

The ENSO Region 1+2 anomaly was +0.2°C and the Region 3.4 anomaly was +0.5°C for the week centered around January 8. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.27°C and the ENSO Region 3.4 anomaly has averaged +0.50°C. The remainder of winter 2019-2020 will likely feature neutral-warm to weak El Niño conditions.

The SOI was -10.64 today.

Today, the preliminary Arctic Oscillation (AO) figure was +4.368.

The AO will average above +3.000 during the January 1-15 period. Since 1950, there were 7 cases when the AO averaged +2.000 or above during that period. Four (57%) saw the AO average for the final 15 days of January average 1.500 or more sigma lower than the January 1-15 figure (1952, 1983, 2005, and 2007) with 1952 and 2005 having a negative average for the latter period. All four had a negative AO average for February. Three (43%) saw smaller declines (1975, 1989, and 1993). All three had February AO averages > 0.000.

No significant stratospheric warming event appears likely through January 22. Wave 2 activity will remain relatively suppressed just past mid-January. Toward January 20, a short-lived moderate amplitude Wave 2 could impact the upper stratosphere. Overall, most of the stratosphere is forecast to remain cold on the EPS.

On January 13, the MJO was in Phase 5 at an amplitude of 3.555 (RMM). The January 12-adjusted amplitude was 3.530. The January 13 amplitude is the highest January figure on record during Phase 5 of the MJO.

Since 1974, there were 8 prior cases where the MJO reached Phase 4 at an amplitude of 1.500 or above in the January 5-20 period. In 7 or 88% of those cases, the MJO progressed into Phases 7 and 8. Progression consistent with the historical experience would increase prospects for the development of a colder pattern during late January, which could continue into at least the start of February.

Further, the MJO was in Phase 4 at an amplitude of 2.273 on January 7 with an AO of +4.048. Since 1974, there were January three cases when the MJO was in Phase 4 at an amplitude of 2.000 or above and an AO of +3.000 or above. In all three cases the Week 3-4 period was colder than the Week 1-2 period (smallest change: 2.7° in 1993; largest change 16.8° in 2007). The change in 14-day average temperatures from the above three cases would imply a January 22-February 3 mean temperature of 10°-12° below the January 8-21 mean temperature in New York City. This data implies that the latter two week period would be colder than normal overall.

In addition, an MJO in Phase 7 at an amplitude of 2.000 or above typically sees measurable snowfall consistent with overall January 16-31 climatology. That would imply approximately 2 measurable snow events for Philadelphia to New York City and 2-3 such events for Boston during the closing two weeks of January.

Based on sensitivity analysis applied to the latest guidance, New York City has an implied 77% probability of a warmer than normal January.

 

 

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18 minutes ago, doncat said:

For a winter month, I don't think  that you could have a more boring first two weeks... +9° temp departure... 0.46" of precip and 1" of snow. I'm not an all snow guy, so give me cold Temps and some stormieness  and I'm ok...but geez  come on.

Last 10 days of December were bad too-temps in the 40's, no precip, yawn city. 

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