Boston Snowfall, ENSO, and Blocking

[weatherwiz]

2008 was barely a +AO...it really was neutral for all intents and purposes. But I didn't make a minimum absolute value threshold when reviewing the years. 1966-1967 was barely negative and had 9.9" in December for BOS...so I didn't have it up there because of barely negative...though if you include March it was a positive AO winter. Ironically, the two big snow months that winter were Feb and Mar which were strongly positive AO.

I'm still not a big fan of having monthly averages or seasonal averages for indices...sure they are good and hold some value but I really wish we could have these indices broken down into like weekly and biweekly readings. It would at least be interesting to see what the data would look like with that.

I really want to go about this with the NAO as the CPC gives daily readings online but I'm not sure how to go about it. I figured I would put the data in excel and compose a 1981-2010 average and then find the standard deviation but not sure where to go from there...

Maybe add each daily value up for 7 days periods then subtract from the average then divide by the standard deviation and that would give me a weekly reading?

For biweekly readings just do the same method but add the first 14 days of the month up then subtract from average and divide by the standard deviation?

[N. OF PIKE]

Many wrote off Blizz 13 as progressive the week before simply because of the very positive NAO. Like you said earlier today temporary blocks occur.

i think this is something that mets may be clear on, but hobbyists like me are not. I did swear many were talking about the likely progressive nature of the pattern leading up to bliz 13 and i guess what im saying is what are the different types of temporary blocks that can slow things down?

[Ginx snewx]

I looked at some storms in DonS AO positive designated years and found negative AO on some of the dates, I agree fully with you. The correlations are sent in a kilter if actual day readings of storms are accounted for.

[Ginx snewx]

i think this is something that mets may be clear on, but hobbyists like me are not. I did swear many were talking about the likely progressive nature of the pattern leading up to bliz 13 and i guess what im saying is what are the different types of temporary blocks that can slow things down?

to be clear it was not just hobbyists who used NAO state as a reason.

[N. OF PIKE]

to be clear it was not just hobbyists who used NAO state as a reason.

What sort of a transient block did we have for bliz 13'

[Ginx snewx]

What sort of a transient block did we have for bliz 13'

A transient one lol, NAO tanked after the storm

[donsutherland1]

I looked at some storms in DonS AO positive designated years and found negative AO on some of the dates, I agree fully with you. The correlations are sent in a kilter if actual day readings of storms are accounted for.

That's correct. My AO averages in the charts are for the DJF period. Most KU snowstorms have commenced with an AO-, though there are exceptions.

[nzucker]

That's correct. My AO averages in the charts are for the DJF period. Most KU snowstorms have commenced with an AO-, though there are exceptions.

We can always get a temporary block like Feb 06. Sometimes those quick transitions to mild produce big systems.

[weathafella]

That's correct. My AO averages in the charts are for the DJF period. Most KU snowstorms have commenced with an AO-, though there are exceptions.

We can always get a temporary block like Feb 06. Sometimes those quick transitions to mild produce big systems.

Arguably feb 1961 was like that.