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December pattern change continued


Typhoon Tip

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what are people's feeling on a 1984-1985 analog?

Enso is a fair match. 83-84 wasn't classified as a true Nina but trimonthly reading showed a decent cool signal during the fall and into December before warming. 84-85 showed the Nina peaking early around Decemberish before starting to wane. Their is some similarity there.

AO/NAO is a different story because they are quite different in the Sept-Dec timefram.

The AO monthlies stayed in negative territory from Sept - November before a break to pos in December and then an outright tank in Jan that stayed firmly negative in Feb.

The NAO monthlies stayed mostly neutral throughout Sept-Dec before turning pretty negative in January.

I did some AO data anlysis a couple weeks ago and posted in my regional thread. There is a pretty tight correlation between Nov/Dec AO readings and the following Januaries. Here is some of the text:

I went back through all of the +AO decembers with a monthly reading of .8 or higher since 1950 and looked at the NAO. Here is the list of the +AO Decembers:

1972

1979

1982

1988

1990

1991

1992

1994

1998

1999

2004

2006

All 12 featured a +NAO during the same month. This isn't surprising because it's not very common (or possible?) to get a solid +AO / -NAO month during the winter months.

Of the 12, only one -NAO January followed and that was Jan of 1980. The index wasn't that strong though because the monthly reading came in at -.75.

I went ahead and rolled to Feb and Mar to see if anything promising popped up and it wasn't good. 1983 had a -.53 Feb, 2005 had a -1.83 March, and 2007 had a -.47 March.

From a strictly statistical standpoint (over a relatively small dataset), a +AO December is a pretty bad omen for the winter as a whole. I know some of these winters listed above were'nt busts or duds but none featured prolonged cold and blocking.

I wouldn't thnk that 84-85 is a good analog year but I also don't think it is set in stone about +AO in January either. It's just pretty uncommon statistically to have a -AO after a strong +AO signal in December.

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Both the Euro and GFS ensembles are splitting the PV next week. It's a start. Bridging the ridge from Mongolia to the Yukon and BC would be HUGE

There are defintely signs of things trying to change, but probably just after 12/25 at the earliest. Lots of work to be done. Splitting that dam PV is one thing, but the PAC still is hostile.

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lol at the gfs. Huge storm on xmas eve/day (actually verbatim its just offshore)...then bitter cold for the 27th/28th then looks like a torch by new years...

About that storm on the 24th though...it looks like good consensus for a sizable storm that day regardless of ptype...or as good of consensus you can get at day 9/10.

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lol at the gfs. Huge storm on xmas eve/day (actually verbatim its just offshore)...then bitter cold for the 27th/28th then looks like a torch by new years...

About that storm on the 24th though...it looks like good consensus for a sizable storm that day regardless of ptype...or as good of consensus you can get at day 9/10.

If that xmas eve storm turns into a rain event, I will have my worst meltdown since Feb 2010.

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If that xmas eve storm turns into a rain event, I will have my worst meltdown since Feb 2010.

I truly hope your 11-12 day threat works out for you although I wouldn't be surprised if the storm track shifted a little over the next 44 model runs

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I truly hope your 11-12 day threat works out for you although I wouldn't be surprised if the storm track shifted a little over the next 44 model runs

I don't expect it to end well, but that doesn't mean I like it.

I thought you are fine since you told yourself there would be no snow until 1/15/12?

It's not easy....a 50* rainer on xmas eve may just break me...esp since I'll be drinking.

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I'm expecting virtually nothing for the next 10 days...but that doesn't mean we wont get a little snow or ice on the front end of one of these things.

BTW guys, this isn't the banter thread, so try to keep posts on the pattern ahead.

Agreed, outside of a 2-3 day transient cold shot, I dont see anything wintry coming up.

MJO is predicted by most GEFS members to head into stage 5...not sure what the CA model is, but I hope its on to something

http://www.cpc.ncep.noaa.gov/products/precip/CWlink/MJO/statphase_full.gifstatphase_full.gif

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I've got my eyes on the clipper d9 and beyond. Funny that is so 1993 esque.........maybe not but it sounds erudite doesn't it? No it doesn't but wtf...

More like a huge Miller B snow storm on Christmas Day.

Guess you missed the quoted post above your after I made that initial bad assessment.

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