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Moving Through December - Changing Patterns and Changing Diapers


ChrisM

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How did the extended Euro ensembles look last night?

They are looking better...near the end of their run they are starting to build heights up again in the Bering/Kamchatka region. That would re-establish cross polar flow.

We may have a chance in the time frame of the 15th-16th as well on the ensembles....long ways out though.

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They are looking better...near the end of their run they are starting to build heights up again in the Bering/Kamchatka region. That would re-establish cross polar flow.

We may have a chance in the time frame of the 15th-16th as well on the ensembles....long ways out though.

Thanks. Until we see a legit -NAO established, I think I'm going to be in the warmer than normal, less than normal snow chances camp.

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We had our one below normal month out of every 1-2 years. Now back to our regularly scheduled baking.

Great point on the main page about how much baseline conditions have changed over the last 50 years and the effect that has on the use of analogs.

I think it's more relevant for using analogs before 1980. Friv is a bit of nut, and everything pre-2000 is overstating the difference.

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I think it's more relevant for using analogs before 1980. Friv is a bit of nut, and everything pre-2000 is overstating the difference.

Comparisons are still useful of course but expecting the same outcomes may not be logical. It's a valid point about the difficulty in ideal/near ideal patterns to deliver sustained cold. Doesn't mean it still doesn't happen it wasn't long ago they were using ice breakers in the canal.

I think we see a change complete prior to the 20th....just hoping we don't get Charlie browned on that in the next few days. Right now still looks good

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The new pattern will dislodge the Arctic Air mid-month into southern Canada / northern US and setup a classic La Niña pattern with New England threats. I'm not buying the west-based blocking solutions showing up on the GEFS that keep coming and going.

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Comparisons are still useful of course but expecting the same outcomes may not be logical. It's a valid point about the difficulty in ideal/near ideal patterns to deliver sustained cold. Doesn't mean it still doesn't happen it wasn't long ago they were using ice breakers in the canal.

I think we see a change complete prior to the 20th....just hoping we don't get Charlie browned on that in the next few days. Right now still looks good

It's not a bad point or anything, but the inherent error in long range forecasting and analog use is probably a magnitude larger than the bias in the Arctic warming.

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Scooter is close to punting December, he, Will, Phil have outlined the details well and there was always a chance the gradient might not set up for sne. I think he is ready to punt south of the pike through Dec 20th. Just a hunch, still in the game last ten days or so but obviously nne is favored.

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Solar flux is low with occasional small flares and solar wind peaks with a coronal hole. Pretty dead. Latest forecast: http://www.swpc.noaa.gov/ftpdir/weekly/27DO.txt

"Forecast of Solar and Geomagnetic Activity

03 December - 29 December 2012

Solar activity is expected to be at low levels with a chance of

isolated M-class flares through the entire forecast period (03-29

December).

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is

expected to be at normal levels except during 14-21 December

following the onset of a coronal hole high speed stream on 11

December and sustained by another stream which is expected to become

geoeffective on 14 December.

Geomagnetic field activity is expected to be at quiet levels for the

majority of the forecast period. Unsettled to potentially active

levels are expected on 11-12, 14, and 29 December associated with

recurrent high speed solar wind streams."

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I don't really buy his post at all, and I'm nowhere near a "denier"

Don's been making a similar (but not so extreme) argument in his forecasts for ahwile now. I think it's legit on some level, because it easier to be warmer than normal nowadays than colder than normal. If you were forecasting for the Arctic itself, you can probably forecast warmer than normal just about every year and be correct.

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Don's been making a similar (but not so extreme) argument in his forecasts for ahwile now. I think it's legit on some level, because it easier to be warmer than normal nowadays than colder than normal. If you were forecasting for the Arctic itself, you can probably forecast warmer than normal just about every year and be correct.

Right, I'm not saying it's false...but it's difficult to compare one year to a 30yr baseline that was pretty chilly up there on a decadal level.

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The argument that you can't get colder outbreaks because of the arctic doesn't make a lot of sense to me. Down here, there's a much better correlation to features like the Bering Sea Strait vortex or ridge and the affect it has with Canada and snowpack....which ultimately can cause an early end to winter.

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