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December Forecast Discussion


Wow

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yes please18zgfs500mbHeightAnomalyNH240.gif

That map is certainly better than what we have been seeing lately. Notice the heights building south of Alaska. Also, notice the higher heights in NW Canada. Not going into weenie mode just yet, but if this set-up verifies, we could see some very cold air in our neck of the woods. I agree with the previous posters. Let's get the cold air in here first and then see what happens after that.

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According to Glenn Burns, the rest of the month will feature normal to above normal temps:

"The new Arctic Oscillation Index (AO) today shows those red squiggly lines (computer models) turning upwards. This would mean temps are likely to be normal to above normal the rest of the month"

Besides the fact he's wrong on that interpretation of the AO, the GFS and EURO both have the AO in negative territory through day 10, despite a turn towards positive which was inevitable.

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Some reason for concern if you take today's Euro Weeklies verbatim.

After some brief cold shots around Christmas, in early January the lower third of the country including our area is again flushed with the Pacific and 850s as high as 15deg C with the 0c line up into New York. If taken literally it shows a demarcation line thru the plains and midwest into the upper Mid Atlantic states. This is what was shown earlier several weeks back in discussion for a longer range outlook. Another cold opportunity then shows up right at the very end of the run.

Who knows how it will exactly play out for sure at this juncture as there is a lot on the table but sustained cold can still be unfortunately questioned if inidications from this evening's weeklies are taken verabatim.

I hate to mention it as Euro Weeklies should not necessarily be used for Snow Accumulation, but I will (since that is what everyone wants to hear). If taken verbatim, they do not show anything in North Carolina except a minor event or 2 in the mountains.

Summary: Best near term opportunity for true winter cold around Christmas.

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According to Glenn Burns, the rest of the month will feature normal to above normal temps:

"The new Arctic Oscillation Index (AO) today shows those red squiggly lines (computer models) turning upwards. This would mean temps are likely to be normal to above normal the rest of the month"

Thats no fun. Oh well bring on January. It was only 50 here today. Massive difference from the record high of 82 on Monday. Cloudy, cold, and drizzle today.

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I'm starting to get pretty excited about the timeframe around christmas, give or take a few days. That's a great look at 276(i know, i know).

Just just about to go full throttle weenie about that..

Who wouldn't love this map within 72 hrs? A classic split flow... PREPARE FOR GLORY!

LSQHV.gif

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I'm starting to get pretty excited about the timeframe around christmas, give or take a few days. That's a great look at 276(i know, i know).

I agree...It is by far the best look we've seen since probably 2010. I will feel a lot better if it continues to show up with in 5 days.

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The Euro last night, not so good. Not nearly as cold as 12z yesterday...though it does have a system on the 24th not sure there would be enough cold air to get us what we need. The Euro ENS gives a little swath of snow across WNC on Christmas.

Yeah, kinda disappointed to see a rather drastic change on the EURO from its previous run, but I suppose that is to be expected for 9-10 day forecasts. Hoping it brings back a colder look for Christmas in future runs.

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Yeah, kinda disappointed to see a rather drastic change on the EURO from its previous run, but I suppose that is to be expected for 9-10 day forecasts. Hoping it brings back a colder look for Christmas in future runs.

The classic AmericanWx way to be excited is if you wake up and there are about 15 - 20 new posts in the morning when you went to bed right after the GFS run. Euro just looked...blah, but I didn't look at any 500 charts.

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The mirage effect for upcoming cold air continues. As we get closer, the models keep making warmer adjustments. The GFS continues to exhibit a cold bias. Even the Euro has been doing that with the two (Wednesday?) 6-10 day cold runs followed by the delay in cold to day 10. Now the Euro has warmed days 9-10! Fool me once, shame on the models. Fool me umpteen times, shame on me. Well, I'm not falling for the cold biases. I had said that that I was taking yesterday's cold day 10 on the Euro with a huge grain thinking it quite possibly was another cold mirage. So, I'm not really disappointed as it is no surprise at all. The GFS cold bias has been atrocious since well back in early autumn. My assumption of no steady cold through all of December continues to look better and better. Maybe January will be different? We'll see, but I'm not counting on it for sure as the Pacific continues to say "No steady cold pattern for you!"

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