Conditions

a) All requested time steps, parameters and levels are chargeable.

b) The purchase of the "Basic Set" +72, +96, +120, +144, +168 hrs is a mandatory prerequisite for the purchase of time steps in the range 12 to 66 hours.

c) No EPU deduction is made for inclusion of WMO Essential Products of the ECMWF.

d) Ensemble Prediction System products

i) Only the whole set of Basic Ensemble Forecasts III i for a given time/field combination will be issued; i.e. output from selected runs of the Ensemble Prediction System will not individually be made available. The Basic Ensemble Forecasts will be issued always in association with the corresponding deterministic output at the same resolution.

ii) Basic Ensemble Forecast Products will not be made available on model levels.

iii) Cluster mean and standard deviation Products will be considered as two parameters, for all clusters of each field/time combination, when calculating the total EPUs. This will be charged at the basic ECMWF tariff level.

iv) Forecast probability Products will be assessed at the rate of one field being equivalent to one parameter when calculating the total number of EPUs. This will then be charged at the basic ECMWF tariff level.

e) Ocean wave products

i) licence costs calculation of wave parameters are based on marine grid points only.

ii) Since the parameters included in the Ocean Wave Products include four parameters (wave height, direction and period, and period of 1D-spectra) which are by nature different to the fifth parameter (2D-spectra), the first four parameters will each be priced as one parameter whereas the 2D-spectra will be priced as equivalent to four parameters.

f) ECMWF's Web Products

i) Access to all analysis and forecast products on the web is provided on an "as is" basis; the product range will be adjusted in the light of experience and in response to the evolution of the forecasting system; newly developed products will be added, but others may be discontinued, at the discretion of ECMWF.

ii) ECMWF endeavours to provide the products with operational priority, but the entire web service or selected web products may be unavailable for up to 24 hours;

iii) Subscribers to the web products may only consult the pages containing the web products by viewing them with a browser; no other downloading aided by computer programs is permitted;

iv) Web plots cannot be redistributed or used in any publication, web sites, television broadcasting or any other media;