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December 2024


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1 hour ago, David-LI said:

500hv.conus.png

 

1 hour ago, brooklynwx99 said:

can't really ask for much more from a general synoptic perspective here. 2.5-3 sigma ridge in an ideal spot with a potent vort diving into the Plains. details will get ironed out but it's nice to see the models keying in more on the second wave

1734858000-xu1LDCfrXZ4.webp.cf5de406e12fc70011b1a043a603f230.webp1734782400-5iJndXrRFog.webp.ac25ae43da78ca51d76504a4317c5c18.webp

Quick question... can you Georges describe what this means for the Lennies of the forum. TIA. 

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5 minutes ago, North and West said:

 

Quick question... can you Georges describe what this means for the Lennies of the forum. TIA. 

very strong ridging will encourage some kind of low pressure (potentially strong) somewhere over the E US. not sure how the first wave will impact the second as the ridge in the west builds, but models are beginning to key in one the second one more and weaken the first a bit. the pattern is favorable for some kind of coastal. the jury is out on how and where a storm forms (if one even does)

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4 minutes ago, the_other_guy said:

I don’t understand why guys keep laughing at the possible snowstorm. This is a weather forum. A possible snowstorm in December in New York. It’s not like talking about a hurricane hitting Iowa.

 

I just don’t get the craziness with the disbelief at the possibility

part of the reason why this subforum has gotten so quiet IMO

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54 minutes ago, the_other_guy said:

I don’t understand why guys keep laughing at the possible snowstorm. This is a weather forum. A possible snowstorm in December in New York. It’s not like talking about a hurricane hitting Iowa.

 

I just don’t get the craziness with the disbelief at the possibility

I think people are a bit jaded with how bad the last few years have been....

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5 hours ago, donsutherland1 said:

It’s beginning to look like January could open on a mild note. 

It looks like the consolidation of the TPV between the Alaska and Greenland has moved up closer to Christmas from earlier runs which kept the ULs separate. 

New run

IMG_2367.thumb.png.3b601ef8aed57a32ebe1bc0f0502c08f.png

Old run

IMG_2368.thumb.png.33aaaf7a82c1ddcceed4f77030fcc726.png

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1 hour ago, the_other_guy said:

I don’t understand why guys keep laughing at the possible snowstorm. This is a weather forum. A possible snowstorm in December in New York. It’s not like talking about a hurricane hitting Iowa.

 

I just don’t get the craziness with the disbelief at the possibility

I think people are just burned out tbh. Basically, lets laugh at hope because of how much crap has gone wrong combined with dashed hopes. 

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9 minutes ago, Brian5671 said:

Agree.   One saving grace so far is that we do have cold air around so maybe sneak something in-last December was very warm overall so we were toast.

Yeah, that has been the only difference so far from past Decembers. We have been getting cold shots every few days 

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Just now, Allsnow said:

Yeah, that has been the only difference so far from past Decembers. We have been getting cold shots which have been largely absent the past few winters 

felt like a midwinter day here today-barely cracked freezing.   Big storms will cut most likely but maybe we could get a light to moderate event

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A much colder air mass now covers the region. The cold will last through the weekend before milder air returns early next week. It could then turn unseasonably mild for a time. Additional rain is possible early next week. Following the rain, it will again turn somewhat colder before a much sharper shot of cold arrives for during or after the next weekend.

Beyond that, the pattern will likely remain changeable through much of the rest of the month on account of a fast jet stream.  The overall anomaly for the final week of the month is unusually uncertain with most of the ensemble guidance and the weekly guidance in disagreement. However, the probability of a mild end to the month and mild start to January has increased.

The NAO fell to a preliminary -2.751 on September 24th (all-time September record: -2.371, September 12, 1971). That was the 9th lowest value on record. La Niña winters following September cases where the NAO fell to -1.900 or below featured a predominantly positive NAO. The most recent such winters were 2016-2017 and 2022-2023. The mean temperatures for those winters in New York City were 39.3° and 41.0° respectively. The 1991-2020 normal value is 36.2°. A warmer to much warmer than normal outcome is favored by the November run of the ECMWF for Winter 2024-2025.

The ENSO Region 1+2 anomaly was +0.1°C and the Region 3.4 anomaly was -0.3°C for the week centered around December 4. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.12°C and the ENSO Region 3.4 anomaly has averaged -0.20°C. Neutral ENSO conditions may still evolve into a La Niña event during the winter. Uncertainty as to whether a La Niña will actually develop continues to increase. Currently, 47% of dynamical models and 22% of the statistical models forecast the development of a La Niña.

The SOI was +5.66 today.

The preliminary Arctic Oscillation (AO) was -1.050 today.

Based on sensitivity analysis applied to the latest guidance, there is an implied 73% probability that New York City will have a colder than normal December (1991-2020 normal). December will likely finish with a mean temperature near 37.5° (1.6° below normal).

 

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11 minutes ago, David-LI said:

Too far out but we can have a white xmas

sn10_acc-imp.us_ne.png

We also need a block with that HP in southeast Canada - problem is past day 5 -7 the models are disagreeing with other models and they are all disagreeing with themselves run to run - lets see if the 0Z GFS has the same solution as the 18Z - I tend to doubt it at this point

prateptype_cat-imp.conus.png

 

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