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Dec/Jan Medium/Long Range Disco


WinterWxLuvr
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Wow, Haymarket Va Weather.com 8 Jan. for giggles
43°     56% NW 7 mph

Cloudy with rain and snow showers early changing to mainly rain showers in the afternoon. High 43F. Winds NW at 5 to 10 mph. Chance of rain 60%.

  • Humidity61%
  • UV Index2 of 11
  • Sunrise7:28 am
  • Sunset5:05 pm

Mon 08 | Night

27°     60% NNW 4 mph

Snow likely. Low 27F. Winds light and variable. Chance of snow 60%. 8 to 12 inches of snow expected.

  • UV Index0 of 11
  • Moonrise4:48 am Waning Crescent
  • Moonset2:06 pm

TWC must get the the 12z GFS early
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5 minutes ago, paulythegun said:


Thanks, I was wondering about that. 1996 keeps popping as #1.

Meanwhile, that was a La Nina lol.  The similarity seems to be with blocking, which we're forecasted to be headed towards. Whether that forecasted -nao comes to fruition might be what determines whether we're in here or the panic room in 2 weeks.

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10 minutes ago, WxUSAF said:

Wooo baby, GFS brings some Christmas magic!!

 

8 minutes ago, Conway7305 said:

A little digital joy to the celebration today.  Nice Fantasy Storm on the LR.  

 

15 minutes ago, Solution Man said:

Boom

Prohibition on post D10 snow maps is rescinded for Christmas.

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It’s hard not getting excited (unless you’re Webb or a few downers here) where we’re going in January looking at medium range ensembles.  GEFS is pushing + height anomalies into GL on NYD.  I picked this panel a few days later as -NAO is settling in but check out the Pacific.  -EPO, +PNA (and cross polar flow) with a STJ split flow undercutting the ridge with a parade of vorts continuing to enter the CONUS.   Roll this forward a few more days and I find it hard to believe we don’t see accumulating snow in the first 7-10 days of January.

image.thumb.png.05015601a440985b09ece2c98c7d940f.png

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It’s hard not getting excited (unless you’re Webb or a few downers here) where we’re going in January looking at medium range ensembles.  GEFS is pushing + height anomalies into GL on NYD.  I picked this panel a few days later as -NAO is settling in but check out the Pacific.  -EPO, +PNA (and cross polar flow) with a STJ split flow undercutting the ridge with a parade of vorts continuing to enter the CONUS.   Roll this forward a few more days and I find it hard to believe we don’t see accumulating snow in the first 7-10 days of January.
image.thumb.png.05015601a440985b09ece2c98c7d940f.png

This frame here definitely intrigues me. The big storm being shown today is roughly 2 weeks out but the pattern load up that eventually rolls downstream to setup that storm is depicted at day 7-8. This timeframe will be crucial to watch over the next 5ish days
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3 hours ago, psuhoffman said:

Pattern analogs are useless right now. They’re spitting out some incredibly snowy periods (1996,2010) and some years that had almost no snow (2002, 1981).  Subtle differences can tilt this either way. 

It’s cover all bases programming. There is no help for those who deny  that.  Not saying that you do. 
Observing  and documenting weather and outcomes for 50 years goes well beyond the results of model sampling examples.

When a delay pattern takes over it rarely reverses. I certainly was here when in mid to late Nov  the examples showed pattern change mid Dec, then Christmas, then end of month, then first few days of Jan, now moving toward mid Jan. Get to about 1/10 and it’s game over. A 10” in mid Feb is not saving winter.  Delayed but not denied is really mostly delayed and in denial.  360 day examples are worth jack shit, 240 much the same. “Guidance” is a euphemism for clueless .  

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