PSD Map Room Weather Products

Forecasts of Teleconnection Indices

These indices are for four patterns of low-frequency tropospheric height variability, as classified in the study of Barnston and Livezey (MWR, 1987). The indices are based on centers-of-action of 500mb height patterns as defined below. The height fields are first spectrally truncated to total wavenumber 10 in order to emphasize large_scale variations. The circulation index of any particular day is a centered 3-day average. This again serves to emphasize the low frequency part of variability.

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