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Its cold enough when do we snow?


Ginx snewx

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It hits home a little bit just how much time we still have before any of this, when the clipper is still 1,000 miles away on the 84 hour NAM. :lol:

:lol: yeah, consider just the amount of change we can see in 48 hours of NAM runs. And we're not even within its range yet!

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Since Saturday temperatures have been running way under MOS. Today was like -8 on GFS MOS and -4 on NAM MOS at Bradley.

Here's the 12hr forecast error for today's high temps from GFS MOS (00z 12/6 run). I've highlighted errors +/- 5 degrees or more...

post-1711-0-22806100-1291694441.png

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NAM MOS is definitely better but still running high.

Yeah errors on NAM MOS were much lower...on the order of 2-4 degrees too warm.

I'm not sure why we're seeing such a warm bias. 925/850 temps are not unusually cold (no more than +1 to +2 SD). Good example of leaning more toward raw model 2 meter temps than MOS. Fortunately, we are able to use bias-corrected MOS databases (which have come in handy this week!)

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Yeah errors on NAM MOS were much lower...on the order of 2-4 degrees too warm.

I'm not sure why we're seeing such a warm bias. 925/850 temps are not unusually cold (no more than +1 to +2 SD). Good example of leaning more toward raw model 2 meter temps than MOS. Fortunately, we are able to use bias-corrected MOS databases (which have come in handy this week!)

Yeah I noticed this weekend so have been undercutting quite a bit. This cold isn't that unusual wrt climo and we're not dealing with strong cold advection so it's sort of odd.

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