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January Medium/Long Range Discussion


nj2va

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Gefs and eps increasing the number of big ticket solutions. Gefs seems to favor all or none. Eps is better in that regard with a fairly substantial cluster of minor events in the mix.

For our tracking purposes it's pretty simple. Shortwaves phase and amplify or they dont and get squished. Ops wont have the northern stream figured out until Wed at the earliest and that's a stretch. Trends with the southern wave can be watched from longer leads. Like right now for instance. Lol

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1 minute ago, Bob Chill said:

 Ops wont have the northern stream figured out until Wed at the earliest and that's a stretch. Trends with the southern wave can be watched from longer leads. Like right now for instance. Lol

Why is that?  Why are NS waves more difficult to model than SS waves?

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32 minutes ago, SnowGoose69 said:

LOL that looks just like 2-23-89 almost across the board at H5 across the nation 

If I am remembering that right I was in NJ at the time about 15 miles south of Philly and we were expecting 6-10" of snow and ended up with wind and flurries. Atlantic City got like 18" though. Coastal scraper with a crazy tight back gradient across NJ. 18+ at shore and nothing at Philly. We would not like a repeat. The beaches have done well enough lately. Frankly we are way overdue for a storm where NYC rains and we get snow. Those seemed way more common years ago. Not like every year common but not super rare. But it's been a while. 

Eta that's partially why their snowfall avg has been going up while ours has been dropping a bit. We used to get some storms every couple years that would track up the coast in a northerly enough track that D.C. And especially west of 95 in the western mid Atlantic was favored and NYC would have rain issues.  

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1 minute ago, jaydreb said:

Why is that?  Why are NS waves more difficult to model than SS waves?

They move MUCH faster than southern stream waves and originate and travel through areas with limited data (satellite data only). When dealing with split flow you'll notice that the vast majority of the time that changes in the northern stream are behind model volatility while the southern stream remains relatively stable. 

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Just now, Bob Chill said:

They move MUCH faster than southern stream waves and originate and travel through areas with limited data (satellite data only). When dealing with split flow you'll notice that the vast majority of the time that changes in the northern stream are behind model volatility while the southern stream remains relatively stable. 

A good recent example is the euro dropping the lakes shortwave interference idea. Just a few runs ago it was a big problem. Now that problem mysteriously vanished. But it could easily pop right back up or things line up better and models show a phased big hit. Problem is you cant trust the northern stream until you get inside of d4-5. Since we still have 8+ days lead time, dont fall for any traps yet. Every run will show a different evolution 

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11 minutes ago, Bob Chill said:

A good recent example is the euro dropping the lakes shortwave interference idea. Just a few runs ago it was a big problem. Now that problem mysteriously vanished. But it could easily pop right back up or things line up better and models show a phased big hit. Problem is you cant trust the northern stream until you get inside of d4-5. Since we still have 8+ days lead time, dont fall for any traps yet. Every run will show a different evolution 

Thanks for the explanation Bob.  GEFS also shows a signal around 1/20.

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Just now, jaydreb said:

Thanks for the explanation Bob.  GEFS also shows a signal around 1/20.

I'm really liking the way ens are shifting for next weekend but it's a tricky setup followed by another (hopefully brief) hostile period. If we score next weekend it will be lucky bonus snow. My expectations are low but it's something to track. The trend last few days is a stronger hp to our north. Too much of a good thing is very possible. We'll know by midweek if we are in the game for real. 

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Looks like the heaviest precip stays over the Eastern Shore.  Gets kicked east but nice improvement at the 500 level.  SV snowmaps has 1-2” for DC...2-4” just east of DC.  4”+ on the eastern shore.  1” line at IAD..sorry Ji.

eta: looking at it again, really nice trend at the 500 level.  Good runs at 12z overall.  

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Just now, nj2va said:

Looks like the heaviest precip stays over the Eastern Shore.  Gets kicked east but nice improvement at the 500 level.  SV snowmaps has 1-2” for DC...2-4” just east of the DC.  4” on the eastern shore.

Descent stream interaction on this run brings it north. Kicker out west is keeping it progressive though. More spacing would open the door to a bigger event.

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Just now, nj2va said:

Looks like the heaviest precip stays over the Eastern Shore.  Gets kicked east but nice improvement at the 500 level.  SV snowmaps has 1-2” for DC...2-4” just east of DC.  4”+ on the eastern shore.

Just a bit too much of a squish from the baby pv. That can easily change. Good euro run imo. Very close to the promised land. I'd be happy with anything honestly. Serious withdrawal right now

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4 minutes ago, nj2va said:

Looks like the heaviest precip stays over the Eastern Shore.  Gets kicked east but nice improvement at the 500 level.  SV snowmaps has 1-2” for DC...2-4” just east of DC.  4”+ on the eastern shore.  1” line at IAD..sorry Ji.

Baby steps.  Euro now shows frozen into our area in <7 days.  GEFS and Icon support.

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Just now, poolz1 said:

H5 vort panel at 138 sure looked like the ns was ready to fully dive in.  Odd how there is only interaction when it looked like a phase was imminent....am I looking at it wrong?

The only hiccup if compressed flat flow out in front. Couldnt amplify. Jack up heights in front just a little and its a warning event. Column is money.

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1 minute ago, poolz1 said:

H5 vort panel at 138 sure looked like the ns was ready to fully dive in.  Odd how there is only interaction when it looked like a phase was imminent....am I looking at it wrong?

Not sure models will get this right day 8

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I like the trend on the GEFS

Ive been waiting to see some similarities between gfs/euro/eps as they all have been pretty conflicting past 7-10 days. Finally think the pattern change is a foot.

The mean ridge out west is showing some stability and the pac fire hose is finally getting blunted. Might take some time to get the lower level temps to cooperate and recover from the pac onslaught but I think we’re starting to see the light at the end of the tunnel. As bob said, NS is tougher on models at med-long leads. Just keep the southern stream adding fuel to the fire and something will catch... eventually

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