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Napril 2025 Obs/Discussion!


Torch Tiger
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8 minutes ago, kdxken said:

Ditty basking in warmth while scooter throws shyte?

Early Next Week:

The start to next week becomes tricky... GFS continues to indicate dry and mild under a broad high, but ECMWF and Canadian show widespread showers with more marine influence via an upper level low and onshore flow. Very messy, changeable pattern and stuck with NBM
until there`s better agreement

Better weather here potentially vs southwest. 

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1 hour ago, ineedsnow said:

I thought some said we were done with frost and start planting 

 

Thursday
Patchy frost before 7am. Otherwise, mostly sunny, with a high near 66. Calm wind becoming southwest 5 to 8 mph in the afternoon.

I said here . No one said some hill billy radiator wouldn’t get to 35 or something 

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23 minutes ago, Damage In Tolland said:

Both way overdone as usual. Just like winter. Buyer beware. Won’t be any big deal 

Eh....actually the "overdone" trend has been limted largely to winter over the course of the past several years...these blocking episodes have had no problem coming to frution and producing during the spring. Not even being sarcastic, either.

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10 minutes ago, 40/70 Benchmark said:

Eh....actually the "overdone" trend has been limted largely to winter over the course of the past several years...these blocking episodes have had no problem coming to frution and producing during the spring. Not even being sarcastic, either.

It’ll probably rain , but any of the flooding stuff won’t happen into SNE. Maybe mid Atlantic 

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The 00z EPS and GEPs means agree with the principle aspects between 60 and 96 hours, but the GEFs ( and the operational GFS included) do not agree.   

The EPS/GEPs have more diving mechanics through 100 W in that range.  

The GEFs ( what's new) lean more progressive in just enough crucial amount that it bi-passes the diving/severing wave space.

What's happening at hemispheric scales in the 60 to 120 hours is a coherent d(contraction) N of the entire circumpolar westerlies - A.K.A., the rising annular mode or a +d(Arctic Oscillation)   That large scale behavior 'abandons' the ongoing wave transports at mid latitudes, and they end up cut off lows.  if/when/whether one sets up between the TV and NE regions has a lot of wiggle room as far as where, and to what scale/degree of amplitude.  

One aspect about the GFS I've noticed is that it at times sags the mean polar jet latitude out of nowhere - wholesale.  When it does, like the 06z version ... it's like it's stepping back 45 days of seasonal change.  I think the rising annular mode is likely to occur, as it's own telecon is positive.   And I've noted in the past the GFS does the over aggressive N stream.  So I find the GFS solution suspect in this case... based on that known behavior, combined with the weight of the other ens means - which also have the rising annular mode.  

I figure for some form or another of cut-off is probable.  But as is usually the case, this is where/when the models perform their worst, pinning down how much and where.   Goes to figure ... they've been all over the place with this thing for the last 4 or 5 day's worth of model cycles.     It could be a very weak system in the TV with a over arching warm ridge spilling 'over the top'....  ranging to a Del Marva gyre that pumps a seasonal corrective QPF load.   

Deterministically all this will be helped/depends on how the flow is handled between 60 and 96 hours as the models transport through ~ 100 W across the continent.  

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