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3rd Winter Blocking Analogs


bluewave

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AO analogs continued to feature blocking patterns two winters after a monthly AO index below -2.5.

I used monthly readings during the Dec-Mar periods. The six analogs that I was able to find still had some degree

of blocking lingering into the 3rd winter. The degree of blocking during the last two winters was so strong that these

analogs are only used a general guide to the possibilities for the 2011-2012 winter.This is not an attempt to

try and nail down seasonal snowfall totals or blocking specifics this early in the game but to look toward the blocking

potential for the coming winter. As always,the Fall pattern going into the winter will hopefully reveal more clues as

to the potential.

March...1958...AO...-2.522

DJFM 1959-1960

March...1962.....-2.848

DJFM 1963-1964

January...1966...-3.232

DJFM 1967-1968

February...1969..-3.114

DJFM 1970-1971

January...1977...-3.767

DJFM 1978-1979

January..1985...-2.806

DJFM 1986-1987

February...2010...-4.266

DJFM 2011-2012 ????

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the monthly AO value was -1.063...Only two years had a lower August value...

year...Aug.AO index...Winters low value

1977.....-1.412.....-3.014 Feb...

1964.....-1.207.....-2.084 Feb...

2012.....-1.063.....-???

1960.....-1.008.....-1.506 Jan...

1950.....-0.851.....-1.928 Dec...

1987.....-0.836.....-1.066 Feb...

1986.....-0.826.....-1.473 Feb...

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the monthly AO value was -1.063...Only two years had a lower August value...

year...Aug.AO index...Winters low value

1977.....-1.412.....-3.014 Feb...

1964.....-1.207.....-2.084 Feb...

2012.....-1.063.....-???

1960.....-1.008.....-1.506 Jan...

1950.....-0.851.....-1.928 Dec...

1987.....-0.836.....-1.066 Feb...

1986.....-0.826.....-1.473 Feb...

Thanks for posting, Uncle.

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