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December 2022 Medium-Long Range Disco


WxUSAF
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18 minutes ago, CAPE said:

Here is your puny '50-50' low squirting out into the NA as a ridge builds ahead of the deep upper low. This is how a "block" becomes ineffective.

1671807600-rm0Rs2MlG4k.png

Yea but my point was why are mid latitude ridges becoming so strong that the last several times we had a -NAO we had this issue with a mid lat ridge pumping all the way north far enough to link with the block. 

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1 minute ago, SnowGolfBro said:

We are in the game. Sure this thing could cut to Minneapolis or slide to Bermuda. But that is the song and dance for most trackable events around here. On to 0z.

If it was a mangled set up it would be easier.  But this is supposed to be the grail pattern.  It should be easier.  

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Just now, BristowWx said:

If it was a mangled set up it would be easier.  But this is supposed to be the grail pattern.  It should be easier.  

I hear you. But even in the best setups, we still need some luck. I don’t think we need a lot to go right to hit this one big. Sometimes we are hoping for a miracle. Right now we just need the models to key in on a canonical look and get locked in! 

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12 minutes ago, psuhoffman said:

Yea but my point was why are mid latitude ridges becoming so strong that the last several times we had a -NAO we had this issue with a mid lat ridge pumping all the way north far enough to link with the block. 

I think we know the answer to that question...

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17 minutes ago, psuhoffman said:

Yea but my point was why are mid latitude ridges becoming so strong that the last several times we had a -NAO we had this issue with a mid lat ridge pumping all the way north far enough to link with the block. 

-4 AO. You'd think it would make things a little easier. I know there's more to it but seems like if 1 thing doesn't line up....

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33 minutes ago, psuhoffman said:

Yea but my point was why are mid latitude ridges becoming so strong that the last several times we had a -NAO we had this issue with a mid lat ridge pumping all the way north far enough to link with the block. 

Bluewave had mentioned this as a possible reason for recent inland runners and coastal huggers.  

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37 minutes ago, psuhoffman said:

Yea but my point was why are mid latitude ridges becoming so strong that the last several times we had a -NAO we had this issue with a mid lat ridge pumping all the way north far enough to link with the block. 

Like I said the other day, it will be interesting to see how this goes if we have a moderate Nino next winter. We usually see HL blocking and it has historically brought us more snow than avg in conjunction with an active STJ. If that combo can't work anymore then its time to move north I guess.

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43 minutes ago, SnowGolfBro said:

We are in the game. Sure this thing could cut to Minneapolis or slide to Bermuda. But that is the song and dance for most trackable events around here. On to 0z.

I agree. We are close. We had a correction at 18z. At 0z, do we have a trend, or another smaller correction 

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1 minute ago, Terpeast said:

Feature to watch is the s/w riding over the alaska block (circled yellow)

If it stays strong and sharp, then we get a good solution per gfs. If it flattens and shears out like the 12z euro, we lose the storm. 

Butterfly effect.

6766EE33-2DEB-4146-A327-841455F7874C.jpeg

Jeez.  That little bend in the isobars will make or break this event even with that h5 look.   

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here’s WPC day 6 and 7:

image.gif.aa54d859b4c0530dc1714d4c2c75f4bb.gif

image.gif.78f7f678bf654fe103b459739cc860b0.gif

disco:

The early part of the updated forecast started with a 06Z/00Z 
model composite with most weight on the 00Z ECMWF and least on the UKMET. Then the blend transitioned to greater emphasis on the 00Z ECMWF mean, last two ECMWF runs, and 00Z CMC/CMC mean with only 
modest incorporation of the 06Z GFS/GEFS mean. This solution led to the best continuity possible given the guidance spread. The new 12Z runs suggest that the "most likely" scenario could well change, depending on how the remainder of the 12Z ensemble suite 
turns out.  
 

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