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February is upon us - pattern change is in order


Baroclinic Zone

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3 minutes ago, RUNNAWAYICEBERG said:

It never has a clue with blocked systems and its thermals are turrable. Not saying a d5 euro op will have it nailed but it will handle those two features, which are top on the important list, much much better.

Euro is notorious for hanging back s/w coming out of the SW so i don't know if you will get a feel for this for another couple days at least.

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6 hours ago, dryslot said:

I have more problems then worrying about the air mass, I'm taking a page out of the MPM handbook, We could snow up here if we have the qpf..........lol

Tell me about it.   Shades of the huge BWI hits a few years back when the models never budged from capture/stall down south.  For a week I was waiting/hoping for them to trend northward and they never did.  I think we were sunny and they had feet.

What would be a real bummer is if my flight home Friday morning were canceled (red-eye into JFK, 11:00 PWM) due to wind and all we had to show for it was rain.

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7 minutes ago, moneypitmike said:

well, nothing could have really competed with yesterday's depictions.  The magnitude of shift is a bit surprising though.

Forecasts have already shifted from SN to RN or SN.

What?  On a Day 5-6 forecast you are surprised it changed a little bit?  There's still a storm in the general vicinity which is about all you can ask for at this lead time.

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Thursday into the weekend...

Battle of airmasses between an ejecting low out of the Central CONUS
up against building high pressure into Canada. Slowed pattern, each
building their own weight, juxtaposition between the two ultimately
determining outcomes. Strong -NAO, -4 to -5 SD, would expect a cool,
dry setup for NE CONUS, storm track lying further S per block. Mid-
Atlantic getting crushed. Interrogating Washington DC top 10 snows
versus the NAO time series after 1948, 5 out of 7 storms, 3 prior to
1948, were associated with a -NAO around -3. Recall February 2010?
Washington DC "snowmageddon" of 17.8"? Monthly NAO averaged near -2.
Cherry picking data? Perhaps. CIPS analogs? Interrogating where NAO
indices <= -1, noting trend of sliding low S of New England, further
so with a stronger -NAO.

Ensemble members clustering off the Delmarva Peninsula while model
deterministic solutions are hugging further N close to Long Island.
Believe S trend is emerging per 25.0z EC. Echoing prior forecaster,
strong -NAO, subsequent block, storms forced E, slowed, evolving
into coastal storms, but storms could get suppressed S. It is all
about timing. Simply wait and see with later forecasts. But per
climatology, prefer ensemble clustering / 25.0z EC which are further
S compared to all other guidance.
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1 minute ago, powderfreak said:

The 925mb temps on the GFS are pretty fascinating associated with the firehose.

Pulling warm, moist air all the way up and in from way out in the Atlantic.  That's how you get a big QPF bomb.

gfs_t925_neng_23.thumb.png.8140c15623c2eafc54beecad51f47c93.png

If we don’t snow I hope for a flood. I have like 11” if precip since new year. 

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