2025-2026 ENSO

[GaWx]

53 minutes ago, donsutherland1 said:

The world is warmer than it has been and is continuing to warm largely due to anthropogenic greenhouse gas emissions. Extreme cold periods are becoming warmer and less frequent than they once were. Nevertheless, that does not mean that such cold, when it occurs regionally, should be dismissed out-of-hand. The kind of sustained deep cold that has occurred in the Great Lakes Region and Northeast is uncommon today. It is not trivial. It is one of this winter's highlights. 

For example, New York City saw a 16-day mean temperature below 20° for the 125th time since record-keeping began in 1869. However, it was the first such occurrence since 1982. That was 44 years ago. That rarity makes it noteworthy. Moreover, it's plausible that at least some of us might not see such sustained and deep cold again during our lifetimes given how infrequent it has become.

That places like Phoenix are on course for their warmest winter on record does not minimize the cold that has just occurred elsewhere. That it has occurred in a warmer and warming world makes it all the more remarkable.

Don, once you adjust normals upward to take into account GW, is deep cold still about as common as it ever was? Example: adjust normals upward by 3F vs what normals were from around 1900. After doing so, is same degree of extreme cold about as common as it was then?

[Stormchaserchuck1]

Subsurface is torching. 

Should I start an El Nino thread for 26-27? 

[Stormchaserchuck1]

I made a new thread

This one should still continue through the Winter, as effects of yearly ENSO state are felt through the following March. 

[donsutherland1]

8 hours ago, GaWx said:

Don, once you adjust normals upward to take into account GW, is deep cold still about as common as it ever was? Example: adjust normals upward by 3F vs what normals were from around 1900. After doing so, is same degree of extreme cold about as common as it was then?

If one takes off about 2.5°, they'd be about as common as they once were.

[bluewave]

11 hours ago, Stormchaserchuck1 said:

I think the consistency of 10s and low 20s for highs and lows in the 0s.. for like a 3 week period down here is pretty impressive. I held 8" snowcover for 2.5 weeks, which is really rare. This happened without real strong upper latitude patterns, like a -NAO or -EPO, although the AO was severely negative:

This is due to inadequacy of relying on the standard teleconnections with patterns like this. It was a weaker version of January 1994 and 2004. Those patterns were colder and sustained for a month instead of 15-20 days like this one was.

While it doesn’t have a formal name, the key driver of the cold was the 500mb block north of Alaska. That is a very cold teleconnection in the East.

You can find other examples such as 12-26-17 to 1-8-18. This was the coldest 16 day period around NYC Metro since then.

 
 

 

 

Minimum 16-Day Mean Avg Temperature 
for WESTCHESTER CO AP, NY
Click column heading to sort ascending, click again to sort descending.

1	16.8	2017-12-26 through 2018-01-10	0
2	16.9	2017-12-25 through 2018-01-09	0
3	17.1	2017-12-24 through 2018-01-08	0
4	17.2	2026-01-24 through 2026-02-08	0
5	17.5	2026-01-25 through 2026-02-09	0

 

Minimum 16-Day Mean Avg Temperature 
for LAGUARDIA AIRPORT, NY
Click column heading to sort ascending, click again to sort descending.

1	20.8	2017-12-26 through 2018-01-10	0
2	20.8	2017-12-25 through 2018-01-09	0
3	20.9	2026-01-24 through 2026-02-08	0

 

Minimum 16-Day Mean Avg Temperature 
for NEWARK LIBERTY INTL AP, NJ
Click column heading to sort ascending, click again to sort descending.

1	19.7	2017-12-26 through 2018-01-10	0
2	19.7	2017-12-25 through 2018-01-09	0
3	20.1	2026-01-24 through 2026-02-08	0

 

[EastonSN+]

4 hours ago, Stormchaserchuck1 said:

Subsurface is torching. 

Should I start an El Nino thread for 26-27? 

Hope your not giving up on the remainder of this winter. I see in the MA forum your not a big fan of the RNA.

[EastonSN+]

Hoping there is enough time to reach phase 8 again before mid March....

[EastonSN+]

Not a Horrible look..

 

[EastonSN+]

This looks to support some blocking 

[GaWx]

14 minutes ago, EastonSN+ said:

Hoping there is enough time to reach phase 8 again before mid March....

 If I get enough time, I’ll analyze the Baltimore daily temperatures for some of the MJO phases in (post) La Niña years in March as a followup to my 20 Feb MJO La Niña MJO phase analysis. If I do, I might start with 8. I’d look at the same 20.

[LakePaste25]

5 hours ago, Stormchaserchuck1 said:

Subsurface is torching. 

Should I start an El Nino thread for 26-27? 

May be lingering effects, but it’s safe to say that La niña is done for.