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Mid to late October disco/banter thread.


CoastalWx

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True..but in years like 02-03, 09-10, 10-11 they bust horribly.

They've been pretty terrible the last 5 winters...'07-'08 through '10-'11 had cold anomalies over a significant portion of the CONUS and each year they had a furnace on the probability maps.

The irony of last year is that they seemed to react to the previous 4 winters and actually forecasted some decent probabilities for below avg temps in the La Nina climo favored areas of the Great Lakes and N plains....then everyone got a blowtorch instead, lol. That was the one year they should have kept their furnace forecast.

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What a torch... people are going to be crying for their mamas.

eh, i can think of one reason why they could be wrong - outside of the 30-year apparent GW that is...

they don't seem to really include much AO consideration in that and one thing the 20 years of observation has repeatedly beaten over our heads is that our latitude's departures in the winter are almost entirely controlled by timing EPO/NAO perturbations against the Pac-N/A alignment - none of which can be predicted on seasonal time scales. It's just not possible given the state of the art.

Hidden in the following chart but can be vetted with statistical analysis, is an ~ 20 year up or down periodicity with the Arctic Oscillation:

800px-Arctic_Oscillation.svg.png

what may or may not be readily observable above the depth of said stat analysis, is that the curve above is has in the last 5 years slipped back below 0 (yes, despite last year's raging boner of a +AO winter). it is obvious to note that the curve is a bumpy ride up and down the hills and valleys with local time-scaled anomalies...blah blah.

but, that's important for equally obvious reasons in that if NCEP is indeed not formulating AO (and subtending EPO and NAO) domain(s) into their assessment than DUH! of course they are going to be warm. What the f else are they left with? the Pacific and the 30-year trend - brrr.. they more than less hint at this in #4 of their reasoning list:

"4) THE NORTH ATLANTIC OSCILLATION(NAO) AND THE PACIFIC NORTH AMERICAN (PNA PATTERNS - WHICH AFFECT THE TEMPERATURE ANOMALY PATTERN ESPECIALLY DURING THE COLD SEASONS. THESE PHENOMENA ARE CONSIDERED LESS PREDICTABLE ON A SEASONAL TIMESCALE THAN ENSO."

In little kid talk that means, 'since we have no f clue what the NAO and PNA will do this year, we are just going to go ahead and assume ENSO has control over everything; which in turn means the temperature tendencies'.

Good luck with that.

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August was about the same as well. A bit more torchy, but we had the nice two week cool down and it came nowhere near the absolute blowtorch they were calling for for the entire country.

They like to persistence forecast and then change when it's obvious. This seems like a textbook ENSO based outlook. Who knows but in the short term they blew the complete flip flop in the Midwest.

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