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Old 20th April 2010 | 14:35
  #1904 (permalink)  
Stoic
 
Joined: Jan 2006
Posts: 145
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From: England
Definition of ash cloud please
My two cents, which map is correct?, the CFMU issued at 1200UTC or the Met Office Sig Wx chart issued via Jeppesen at 1230UTC showing two completely different ash cloud concentrations.
At what concentration is ash in the atmosphere an ash cloud?
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