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

[Ed Davie]

Just out of curiosity, what's a PDO?
Ed
  ----- Original Message ----- 
  From: Martha Khoury
  To: Forest Grove local interests list
  Sent: Wednesday, April 15, 2009 3:49 PM
  Subject: [Grovenet] For the weather buffs: 
Record Setting March PDO


  >
  > 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

  _______________________________________________
  GroveNet mailing list
  GroveNet at rdrop.com
  http://www.rdrop.com/mailman/listinfo/grovenet