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'Forward' part in 4d Var. (prediction)
(Met Office 4d Var)
Pressure and potential temperature fields (model level 22 shown) are advected forwards in time (12 timesteps).
Fields are deviations from the (t=0) fields.
The observation that we are interested in occurs at t=7.
It is an ATOVS satellite radiance observation above the NE Pacific Ocean.
Pressure (left) Potential temperature (right)