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January/February Mid/Long Range Disco IV: A New Hope


stormtracker
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2 hours ago, windycutter said:

On the above gif, It appears that the High comes in to late with a low pushing through the north of New England. Wouldn't the Low be problematic?

Regardless of what precip field that's showing, verbatim that's high elevation mountains heavy snow NC and VA . Thickness appears to be shown as ab out 543 in those area's. As long as 850 is 0 to -2T C. . 

     Of course, does most of us no good. Hopefully, more cold will be injected than modeled. 

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Wetter than average/-NAO December's evolves into +NAO February's

Drier than average/+NAO December's evolves into -NAO February's

75 years of basis.. pretty cool correlation there. The Feb NAO signal> Dec NAO(pick and choose)

*wetter/drier than average across the US

 

Strong -PNA December's = -PNA/+NAO February's at 0.68 correlation

Strong +PNA December's = +PNA/-NAO February's at 0.70 correlation

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1 hour ago, Stormchaserchuck1 said:

We actually have some pretty big pressure hitting the coast of Alaska today, and it's so warm out.. feels like 50. If the -PNA/+NAO that these LR models are showing verifies it will be 60s/70s

1932912565_f0(1).thumb.gif.13eafe637ffc735e990edf0182ba6806.gif

176909042_f384(2).thumb.gif.c7d52e40b85b95b6e015cfc3c564bff9.gif

^look how this is kind of a 180*/from today, and it's still so warm out. Pressure breaching the N. Pacific is definitely a staple of this time. 

(I still think there is a +PNA signal 2nd week of February, will be interesting to see how this evolves.)

Yeah, many have punted mid Feb as very mild due to lrg and MJO warm phase forecast by most guidance. Hopefully, MJO avoids those phases then . Would be our luck to get a + PNA then and the MJO foul us up then.

     It's just that type Winter. 

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34 minutes ago, Ji said:
41 minutes ago, Maestrobjwa said:
Warm neutral isn't gonna do much good...If we're already trending warmer, doesn't that make a case for a more established niño next winter?

Warm neutral is prob better than nina....

Yeah but if neutrals are no longer working (the last two were awful), and a very weak niño a la 2018-19 doesn't work...we better hope for a legit one!

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42 minutes ago, Ji said:
49 minutes ago, Maestrobjwa said:
Warm neutral isn't gonna do much good...If we're already trending warmer, doesn't that make a case for a more established niño next winter?

Warm neutral is prob better than nina....

Too small a sample to draw conclusions but the last one was 2020 and the last 4 were all below below normal! 

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These 3 panels illustrate how problematic next week is. Flat, fast flow with weak strung out vorticity in the "southern stream", modified dry cold, and suppressed moisture feed. Need a robust shortwave to bring moisture northward, and even then the 'true cold' is too far north, associated with the W-E oriented TPV.

1675296000-hdzR9n0F3LA.png

1675296000-ZyhhwX2ruQw.png

1675296000-fgSp1wGwwrg.png

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23 minutes ago, Ji said:
31 minutes ago, psuhoffman said:
Too small a sample to draw conclusions but the last one was 2020 and the last 4 were all below below normal! 

Why...was there a se ridge?

There have only been 2 warm neutral winters since 2000 and 4 since 1950.  Way too small a sample to draw conclusions. But neutral is only within .5 of 0. Even a weak Nino often has muted impacts so I think it’s fair to lump all neutrals together. This is the composite for all neutral winters since 2000

10F2FC59-67A2-4C02-9ECD-C914F2A241AF.png.400c0ff2a9d16f5293a942be09240b87.png
We were discussing this the other day. Actually the flip in enso neutral winters accounts for a large portion of our degraded snow climo. 
 

From 1950 to 1993 neutral winters averaged 24” at BWI with 52% above avg. 

The last 30 years they avg 12” with 17% above avg.   Enso neutral used to be almost as good as Nino and now it’s been the worst enso state the past 30 years by avg, median, and % above normal. 
 

The main cause us a persistent SER.  @Terpeast speculated this winter is actually behaving more like a neutral than a Nina.  I’ve also tried to point this out when people root for a Nina to fade but it’s too late. Once you enter winter it’s better if the Nina persists. Neutral is even worse!  We actually have a better chance at a snowy Feb/Mar in a Nina that doesn’t fade  

 

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