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Late February will be rocking. February Long range Discussion thread


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12 minutes ago, CAPE said:

Maybe the SSW is having a favorable impact that will improve our prospects for once. Encouraging to see the depicted transition in the high latitudes on guidance. Once again we wait and see if it actually materializes in a meaningful way.

Actually, has it happened yet? Because in La Nina/+QBO, you usually don't get Stratosphere warmings. 

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27 minutes ago, 87storms said:


I’m pretty sure we want a +pna, but sounds like we might get enough blocking to offset it.

Believe it or not, there is a slight -pna correlation. what we need is neutral to positive anomalies over Alaska. 

141_157.7_68_49.6.2_15.gif.4b40ea1486c2e81daea9cd37b43deb0e.gif

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Alaska

141_157.7_68_49.7_18_47.gif.d231dc609dd4dd112ba9f3b9c271148d.gif

and believe it or not there is a slight +nao correlation to snow too. If you minus the rising-out-of-negNAO-snowstorms, the correlation is greater. 

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Believe it or not, there is a slight -pna correlation. what we need is neutral to positive anomalies over Alaska. 
141_157.7_68_49.6.2_15.gif.4b40ea1486c2e81daea9cd37b43deb0e.gif
141_157.7_68_49.6.3.5.gif.10e9a881d42898dbaf7ee7c13d7210b8.gif
Alaska
141_157.7_68_49.7_18_47.gif.d231dc609dd4dd112ba9f3b9c271148d.gif
and believe it or not there is a slight +nao correlation to snow too. If you minus the rising-out-of-negNAO-snowstorms, the correlation is greater. 

Yea, we can’t have the mean trough as far west as it’s been. It just doesn’t work with the ridging in the south unless we get a well-timed hp/vort.
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The great pattern shifts have been 10 to 14 days away all winter….latest WB GFS extended teleconnections along with SPV and MJO give us the Hail Mary.  We will see but the ensembles are just getting into the early part of this period  so every 6 hour run does not mean much at this point. Snow means are bad the next 2 weeks.

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7 minutes ago, Weather Will said:

The great pattern shifts have been 10 to 14 days away all winter….latest GFS extended teleconnections along with SPV and MJO give us the Hail Mary.  We will see but the ensembles are just getting into the early part of this period  so every 6 hour run does not mean much at this point. Snow means are bad the next 2 weeks.

HL NAM doesn't look good in the long range, plus the effects of the SSWE is still very much uncertain. Might take up to 25 days to deliver a SSWE snowfall event and even if we get a West based NAO block it does not gaurantee snowy outcomes at our lattitude. Persistance needs to be broken and so far the normal crummy caveats apply. 

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9 minutes ago, frd said:

HL NAM doesn't look good in the long range, plus the effects of the SSWE is still very much uncertain. Might take up to 25 days to deliver a SSWE snowfall event and even if we get a West based NAO block it does not gaurantee snowy outcomes at our lattitude. Persistance needs to be broken and so far the normal crummy caveats apply. 

if this goes up in smoke I'm going to put my degree in a paper shredder. retrograding blocks like this that come from strong Scandinavian highs usually work out

add in the fact that it's moving up in time and becoming stronger, as well as being associated with the SPV getting ripped apart, and I think the block is likely going to happen. I wouldn't worry about run to run minutiae when there is a west-based blocking signal this strong 

ecmwf-ensemble-avg-nhemi-z500_anom-1676764800-1677520800-1678060800-20-2.thumb.gif.b5a2ec16ab9efdd4f7a2775b0b461fc6.gif

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9 minutes ago, frd said:

HL NAM doesn't look good in the long range, plus the effects of the SSWE is still very much uncertain. Might take up to 25 days to deliver a SSWE snowfall event and even if we get a West based NAO block it does not gaurantee snowy outcomes at our lattitude. Persistance needs to be broken and so far the normal crummy caveats apply. 

I'm not sure about all these 'timing rules' for tropospheric impacts associated with SSW events. Above my pay grade. My guess is it's a crapshoot like the rest of this stuff. So having said that, IF the longwave pattern currently being advertised on the means for early March verify(especially the EPS), we should have a chance or 2 before mid month when climo becomes really hostile for the lowlands.

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11 minutes ago, brooklynwx99 said:

if this goes up in smoke I'm going to put my degree in a paper shredder. retrograding blocks like this that come from strong Scandinavian highs usually work out

add in the fact that it's moving up in time and becoming stronger, as well as being associated with the SPV getting ripped apart, and I think the block is likely going to happen. I wouldn't worry about run to run minutiae when there is a west-based blocking signal this strong 

We've been in this negative-NAO correlation/Pacific thing since 2013, and more so 2019. March 2018 was a west-based NAO block that came from SSW. I am afraid the strength of -NAO will only be mirrored by strength of +EPO/-PNA. 

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12 minutes ago, brooklynwx99 said:

if this goes up in smoke I'm going to put my degree in a paper shredder. retrograding blocks like this that come from strong Scandinavian highs usually work out

add in the fact that it's moving up in time and becoming stronger, as well as being associated with the SPV getting ripped apart, and I think the block is likely going to happen. I wouldn't worry about run to run minutiae when there is a west-based blocking signal this strong 

ecmwf-ensemble-avg-nhemi-z500_anom-1676764800-1677520800-1678060800-20-2.thumb.gif.b5a2ec16ab9efdd4f7a2775b0b461fc6.gif

 

Screenshot 2023-02-19 at 10.33.56 AM.png

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