Abstract: Further results concerning the mean gates of the bimodal wavnumber 2 to 4 amplitude probability density distribution are presented followed by composites of transitions from one side of this distribution to the other. The ...

Abstract: A preliminary study of the probability density distribution of the wavenumber 3 amplitude in midlatitudes of the Southern Hemisphere is undertaken with 4.25 years of 500 mb height data compiled by the European Centre for ...

Abstract: The transient eddy height variance in midlatitudes during Southern Hemisphere (SH) winter achieves its largest value at zonal wavenumber 3. The presence of two highly statistically significant modes in the probability ...

Abstract: Perpetual January and July simulations each 1200 days long of the NCAR Community Climate Model (CCM0B) are investigated for the existence of large scale, midlatitude weather regimes. Four realizations of the midlatitude ...

Abstract: The effect of the zonally asymmetric forcing due to topography on the low-frequency variability of the large-scale flow is investigated for Northern Hemisphere winter conditions. Extended general circulation model integrations ...

Abstract: The investigation for evidence of multiple statistical flow regimes in the amplitude of the planetary-scale waves presented earlier by Hansen and Sutera is revisited. A methodology for generating Monte Carlo tests of the ...

Abstract: The composite of large amplitude flow anomalies identified from extremely large amplitudes of the planetary-scale waves is examined in terms of the temporal and spatial evolution of both the large-scale flow and the storm ...

Abstract: The probability density distribution of the speed, horizontal shear and vertical shear of the zonal-mean wind are computed from a 16-winter NMC dataset in a study designed to complement an earlier study of the planetary-scale ...

Abstract: Recent studies of low-frequency variability have shown that at least two planetary-scale statistical flow regimes exist in the Northern Hemisphere winter circulation both in observations and in a general circulation model. ...

Abstract: The statistical properties of a measure of planetary-scale wave activity are investigated in a 16 winter NMC dataset. The probability density distribution of the wavenumber 2 to 4 amplitude is found to be bimodal, confirming ...