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The extended range (monthly) ensemble is run daily based on 00UTC data.  The products cover the period up to Day46 and are derived from a 100 member ensemble with resolution 36km.   The extended range ENS is independent of the medium range ENS and has it's own control (control46) and extended range model climate (ER-M-climate).

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Re-forecasts provide an Extended Range climate (ER-M-climate) and associated probability distribution functions (pdfs) for several variables.  The latest Extended Range ENS extended range ensemble forecasts and the associated probability density functions can be compared with the ER-M-Climate.  The differences between the two are used as the basis of model products any model drift is effectively removed. 

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