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End of September/Early October banter/disco.


CoastalWx

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There's an awful lot of uncertainty regard October temps IMHO. Theres going to be some pretty cold air to the north in central and southern Canada...its just a question of how amplified the western ridge will be which determines how far south and east the cold gets. The NAO looks positive, so that will be trying to create zonal flow in the east...the best way to counter that is a more amplified western ridge.

But there's questions as to the orientation of the western ridge too...some of the Euro ensembles especially are trying to almost have an RNA type bend to the southwest in the trough. Though they seem to be slowly backing off this idea.

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There's an awful lot of uncertainty regard October temps IMHO. Theres going to be some pretty cold air to the north in central and southern Canada...its just a question of how amplified the western ridge will be which determines how far south and east the cold gets. The NAO looks positive, so that will be trying to create zonal flow in the east...the best way to counter that is a more amplified western ridge.

But there's questions as to the orientation of the western ridge too...some of the Euro ensembles especially are trying to almost have an RNA type bend to the southwest in the trough. Though they seem to be slowly backing off this idea.

Pretty large discrepancy after the 1st week. I have a lot of respect for the euro ensembles, but I wonder if they are too flat.

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May have been mentioned, but temps this morning were running 20-25F warmer than 24 hours prior for most of CT along and SE of I-84. Groton and New Haven both had +25F departures at 7 a.m. today vs. 7 a.m. yesterday. ALSO, some spots were already at 70 degrees by 8 a.m., their normal high for the date!

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You can clearly see the difference between the Euro ensembles and GEFS at day 10...the GEFS have a pretty deep low anomaly south of the Aleutians which helps pump up the PNA ridge better....also look at the Atlantic...it has a N ATL ridge

00zgfsensembles500mbhei.gif

Now look at the Euro ensembles verifying at the same time

00zecmwfens500mbheighta.gif

No big low anomalies south of the Aleutians (just a weak one SW)...and look at the almost reverse PNA type kink in the western CONUS pattern...quite different from the GEFS.

Finally, look at the raging +NAO with no N ATL ridge whatsoever...not even a hint of one. I'm sure the lack of a N ATL ridge, weaker western PNA ridge and lack of low heights S of the Aleutians are not mutually exclusive...they all tie into eachother to some extent.

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You can clearly see the difference between the Euro ensembles and GEFS at day 10...the GEFS have a pretty deep low anomaly south of the Aleutians which helps pump up the PNA ridge better....also look at the Atlantic...it has a N ATL ridge

00zgfsensembles500mbhei.gif

Now look at the Euro ensembles verifying at the same time

00zecmwfens500mbheighta.gif

No big low anomalies south of the Aleutians (just a weak one SW)...and look at the almost reverse PNA type kink in the western CONUS pattern...quite different from the GEFS.

Finally, look at the raging +NAO with no N ATL ridge whatsoever...not even a hint of one. I'm sure the lack of a N ATL ridge, weaker western PNA ridge and lack of low heights S of the Aleutians are not mutually exclusive...they all tie into eachother to some extent.

But wouldn't the recurvature of the typhoons in the WEST PAC cause the GEFS to verify?

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But wouldn't the recurvature of the typhoons in the WEST PAC cause the GEFS to verify?

Not necessarily. I've seen systems head into the North Pac and not really do much to the flow. They can amplify the pattern if they develop into a big Aleutian low though. so the whole thought process behind it has merit. As usual, both models may be too aggressive in their own solutions and it may be some sort of a compromise. Now whether one model suite wins outright remains to be seen.

In looking at East Asia the GEFS have another tropical system that reinforces the Aleutian low at hr 240. Part of me thinks the GEFS may be correct to some extent, but we've all seen the GEFS do this and then come back closer to reality. So my guess is some sort of a possible compromise is in store.

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GFS says we might be socked in all weekend. The steadier rains on Friday, but Sat/Sun look like a weak NE flow with that ULL diving south from the lakes...that might be the type of day with low clouds/drizzle/mist...esp in eastern areas.

Woohoo. Spring in Sept. Hopefully Sunday is not a washout. It did not look it.

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