= A(i; j+1;u) A(i; j;u) (6)
DFj = F(i; j+1; t) F(i; j; t) (7)
11
and
Gi = max(jDAij; jDFij) (8)
G j = max(jDA
jj; jDFjj) (9)
where F is the target (predicted) MSLP or Z field at time t, A is the analyzed MSLP or Z field
from the archive at time u (i.e candidate analogue), DFi, DFj are the predicted gradients in the
east-west and south-north directions, DAi, DA j the analyzed gradients in the same
/media/vedurstofan/utgafa/skyrslur/2014/VI_2014_006.pdf