Abstract: Blackmon (1976) used spherical harmonics to determine the root-mean-square (rms) 500 mb geo-potential height in various two-dimensional wavenumber regimes. This paper extends his analysis to 1000 mb and presents for both ...

Abstract: The three-dimensional structure of the extratropical Northern Hemisphere summertime general circulation is documented by making use of twice-daily operational analyses at nine pressure levels (1000?100 mb) for 12 summers ...

Abstract: Wintertime and summertime mean 500 mb vertical velocity fields for the extratropical Northern Hemisphere are calculated by several methods from general circulation statistics compiled from National Meteorological Center ...

Abstract: Twelve summers and 11 winters of Northern Hemisphere 500 and 1000 mb geopotential height are used to calculate the third and fourth moments of height in the nondimensional form of skewness and kurtosis. Geopotential height ...

Abstract: Eleven winters and twelve summers of twice-daily National Meteorological Center (NMC) analyses of geopotential height and temperature at five levels for the extratropical Northern Hemisphere are partitioned into long-wave ...

Abstract: The annual march of surface temperature is documented on a global basis by mapping the amplitudes and phases of the annual and semiannual cycles in a vectorial format. The annual cycle in Northern Hemisphere geopotential ...

Abstract: Teleconnections are calculated from monthly mean anomalies of sea level pressure and 500 mb geopotential height for the Southern Hemisphere (10?90°S) for five-month winter and summer seasons. The monthly means were calculated ...

Abstract: The operational model used to generate medium-range forecasts at the National Meteorological Center (NMC) has undergone significant changes in the last few years, resulting in considerable improvement in the skill of its ...

Abstract: No Abstract.

Abstract: This study assesses the skill of forecasts of precipitation and surface temperature by the National Meteorological Center's (NMC) global model in the 108 consecutive 30-day forecasts [known as Dynamical Extended Range ...