[Grovenet] For the weather buffs: Record Setting March PDO

[Martha Khoury]

>
> Good morning:
>
> Here are a few comments about the amazingly cold March PDO figure  
> just released yesterday ---
>
> * March 2009's PDO figure of -1.59 is officially the coldest March  
> PDO figure since 1972.
>
> * The current 12 month running average is now -1.46. That is the  
> also the single coldest 12 month running average since 1970-1971 and  
> is in the top 5 of all-time (109 years) coldest 12 month running  
> averages.
>
> * March's PDO is the 5th coldest March reading in 109 years (from  
> 1900-2009) and is ranked as follows ---
>
> 1956  -2.56
> 1972  -2.09
> 1951  -1.90
> 1971  -1.68
> 2009  -1.59
>
> Historical notes --- December of 1972 featured one of the coldest  
> (if not "the" coldest) December arctic outbreak in recorded history  
> in the Portland area. 1951 also featured a strong south windstorm in  
> December.
>
> Steve Pierce
> Executive Councilor - Oregon AMS