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December Obs and Banter


WinterWxLuvr

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Thanks! Yeah..it does seem like there are a good few of us bringing home babies this winter.

A snowbaby would be awesome, as would having a storm while I'm on paternity leave!

Thats what I am hoping for. Give me 50 degrees and sun on the D-Day (whenever that is)... but give me snow while I'm home everyday :lol:

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Now that I made my eyes hurt looking at raleigh's euro maps it isn't as bad as I thought. No torches anywhere from what I can see. We're moving into the coldest normal highs of the year too. We're at a time when things don't need to be perfect to snow.

Good:

No torch

Active precip pattern

Coldest climo windo

Bad:

No cold

Lotsa rain

Average highs still 10 degrees above freezing

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here's a post i did about december warmth rolled over. i didn't have a ton of time, but there was no real major signal.. other than perhaps recent warm decembers tending to lead to warm jan-febs more often than the overall record which is close to half and half.

http://www.washingtonpost.com/blogs/capital-weather-gang/post/december-warmth-in-dc-and-its-signal-for-temperatures-the-rest-of-winter/2012/12/19/ae24f94a-4989-11e2-b6f0-e851e741d196_blog.html

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December of 1996 had a NAO of -1.41, AO of -1.721, and PNA of -1.23 and it looked like this:

I pulled a list of winter months that featured an AO of -1.5 or lower and PNA of -1.0 or lower. Not a lot of instances but there are some for sure. I looked at temp anoms for each and it's a mixed bag. Some above normal and some around normal. Very few below normal though. The significance of a -pna in tandem with a -ao is definitely worth taking note of.

Here's the list in case anyone wants to disect it:

Dec 61

Dec 96

Dec 10

Jan 69

Feb 55

Feb 56

Feb 57

Feb 66

Feb 69

Since there were 5 in Feb I pulled the temp composite for the years and it looks like this:

Pretty obvious this pattern can suck and we definitely don't want it to continue. Winter of 68-69 was dominated by a -ao and -pna from start to finish. It wasn't a warm winter though. Just about average. I have no idea about snowfall but it was a nino so it probably doesn't compare well at all.

96-97 was a cold neutral enso year following a Nina. Analog? Not really IMO.

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Now that I made my eyes hurt looking at raleigh's euro maps it isn't as bad as I thought. No torches anywhere from what I can see. We're moving into the coldest normal highs of the year too. We're at a time when things don't need to be perfect to snow.

Good:

No torch

Active precip pattern

Coldest climo windo

Bad:

No cold

Lotsa rain

Average highs still 10 degrees above freezing

Don't worry in 12 hours it will show the exact opposite.

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It's sad how there was hope back in November for a cold pattern to set up, at least for a few days or a week in December, and that never materialized. As has happened all to often, once again, we are having to punt on a winter month, and are left hoping that the cold and stormy pattern showing 10 days out can somehow become reality. Feels like we have been in this same situation so many times.

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