Abstract: The 24 systematic forecast errors in the 50 mb geopotential height from the ECMWF and NMC operational prediction models are compared and analyzed. During the winter of 198 the error patterns from the two models over the ...

Abstract: Readily available forecasts of winter season temperature anomalies for the continental United States are analyzed and compared to the observed anomalies for each of the past five winter seasons. Forcast skill is evaluated ...

Abstract: The total and systematic errors in the 500 mb geopotential height forecasts from the NMC grid-point and spectral operational models are compared and contrasted for two recent winters. The spectral model is shown to be an ...

Abstract: The design of a digital filter is outlined and its application as a band-pass filter to separate various scales from an atmospheric field in a limited domain is discussed. The accuracy of the filter is demonstrated by ...

Abstract: A methodology is formulated to evaluate the possible changes in decadal-timescale (10?20-yr period) surface temperature variability and associated low-frequency fluctuations of anthropogenic forcing and changes in climate ...