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January 24-25: Miracle or Mirage


stormtracker
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Just now, Maestrobjwa said:

It was a really big jump. I mean...we legit don't know if that's the northern extent or not--it's just Tuesday.

Agreed, what’s to say it doesn’t jump back the other way tomorrow. At 12Z you thought the storm was gone if you saw the GFS, look where it is now. 

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2 minutes ago, WxMan1 said:

Like the CMC, Ukie begins to change to sleet around midday over DCA, but not much precip after that. Almost like ending as a period of sleet that lightens up quickly by mid/late afternoon. Still a nice front end THUMP before that. Considering how intense that front end WAA snow is...I'll take it. Notice the low in WV by 18Z Sun. Yeah, not the kind of Miller B you want, but again, this would be one hell of an acceptable front-end thump. 

Screenshot (35).png

Verbatim its much better than a supressed weak sauce run. The trend is concerning however.

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4 minutes ago, WxMan1 said:

Like the CMC, Ukie begins to change to sleet around midday over DCA, but not much precip after that. Almost like ending as a period of sleet that lightens up quickly by mid/late afternoon. Still a nice front end THUMP before that. Considering how intense that front end WAA snow is...I'll take it. Notice the low in WV by 18Z Sun. Yeah, not the kind of Miller B you want, but again, this would be one hell of an acceptable front-end thump. 

Screenshot (35).png

This is roughly the QPF that falls prior to the changeover in and around DC.

Pretty intense but if the trend continues....

.

qpf_acc-imp.us_ma.png

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3 minutes ago, ravensrule said:

Agreed, what’s to say it doesn’t jump back the other way tomorrow. At 12Z you thought the storm was gone if you saw the GFS, look where it is now. 

Agree. Why I said I'll give it two more runs to see if this is a blip or an actual trend. 

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50 minutes ago, Scraff said:

Incredible GooFuS run! Is it wrong that I wanted 1 more full panel to keep it rolling after 132? How can we slow it down so we can make a run to BECSville?B)

We ARE probably gonna make a run at BECSville.

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18 minutes ago, wxdude64 said:

Not cliff jumping, just stating facts. You start pushing lows into WV then 80% or more of this forum is waving bye-bye to large snow numbers and hello to 2,3,4 inches of front end then 1-2 inches of sleet or quarter inch of freezing rain, then MAYBE a switch back to snow and another 3-5 inches. Again, only a couple models showing this but a bad, bad trend is starting to rear up. 

80% huh?

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From the NYC thread but relevant for us as well in regards to the Ukie solution:

19 minutes ago, TriPol said:

A primary that survives all the way to Erie in this pattern is structurally suspect. It requires the cold dome to retreat faster than the synoptic setup allows. The 1032 mb high to the west is not a paper tiger. It is feeding low-level cold and keeping the boundary pinned south and east. Primaries do not just waltz through that without consequences.

Ukie keeping it mostly snow in NYC while dragging the primary to Erie is internally inconsistent. If the primary truly gets that far north and west, the low-level flow into NYC backs too much from the south. You do not get to keep a clean snow profile and a strong inland primary at the same time. One of those has to give.

What usually gives is the primary.

In reality, with this kind of trough geometry and thickness field, the inland low weakens earlier. Energy transfers near the coast. The inland center becomes a bag of isobars and stops mattering. That is exactly the evolution the GFS, Euro, and most ensembles favor in similar regimes.

Ukie has a known bias here. It over-amplifies inland primaries in cold-dominant patterns, especially at this lead time. It often delays or underplays the transfer, then corrects late when the coastal baroclinic zone asserts itself. La la land is not an unfair description.

 

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