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RISA Diagnosis of Two Blocking Events That Occurred Simultaneously in the Midlatitude Northern Hemisphere
Publisher: American Meteorological Society
Abstract: Using the Goddard Laboratory for Atmospheres Goddard Earth Observing System-1 analyses, the horizontal distribution of atmospheric forcing processes involved in the growth, maintenance, and decay of two Northern Hemisphere ...
Ageostrophic Forcing in a Height Tendency Equation
Publisher: American Meteorological Society
Abstract: The role of the ageostrophic vorticity tendencies in the Zwack?Okossi vorticity tendency equation has been examined within the context that this term in the equation acts as a correction term for the vorticity tendency or ...
An Extratropical Air–Sea Interaction over the North Pacific in Association with a Preceding El Niño Episode in Early Summer
Publisher: American Meteorological Society
Abstract: Using data for the month of June from 1951 through 2000, this study examined the air?sea interactions over the North Pacific after El Niño matured during the preceding fall season. The principal findings of this work are ...
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part II: Free Mode Characteristics of NAO and Diagnostic Study
Publisher: American Meteorological Society
Abstract: Through calculating the scatter diagrams of the streamfunction (?P or ?T) versus potential vorticity (PV) (qP or qT), where ?P and ?T are the planetary-scale streamfunction and total streamfunction, respectively, and using ...
Dynamics of Eddy-Driven Low-Frequency Dipole Modes. Part I: A Simple Model of North Atlantic Oscillations
Publisher: American Meteorological Society
Abstract: A simple theoretical model is proposed to clarify how synoptic-scale waves drive the life cycle of the North Atlantic Oscillation (NAO) with a period of nearly two weeks. This model is able to elucidate what determines the ...
The Interactions between a Midlatitude Blocking Anticyclone and Synoptic-Scale Cyclones That Occurred during the Summer Season
Publisher: American Meteorological Society
Abstract: Using the Goddard Laboratory for Atmospheres Goddard Earth Observing System 5-yr analyses and the Zwack?Okossi equation as the diagnostic tool, the horizontal distribution of the dynamic and thermodynamic forcing processes ...
The Application of a Simple Method for the Verification of Weather Forecasts and Seasonal Variations in Forecast Accuracy
Publisher: American Meteorological Society
Abstract: The evaluation of weather forecast accuracy has always been a difficult subject to address for many reasons. In this study, a simple semiobjective method is used to examine the accuracy of zone forecasts issued by the ...
The Planetary- and Synoptic-Scale Interactions in a Southeast Pacific Blocking Episode Using PV Diagnostics
Publisher: American Meteorological Society
Abstract: The synoptic- and planetary-scale forcing in two blocking anticyclones occurring over the southeast Pacific Ocean was examined using potential vorticity diagnostics. While many studies have examined the dynamic and ...
A Diagnosis of the Explosive Development of Two Extratropical Cyclones
Publisher: American Meteorological Society
Abstract: This paper examines the 24-h explosive development periods of two extratropical cyclones, the first occurring over the Gulf Stream off the coast of New England from 18 to 19 January 1979 and the second occurring over the ...
A Climatology of Northern Hemisphere Blocking
Publisher: American Meteorological Society
Abstract: In this paper a 55-yr (1948?2002) Northern Hemisphere blocking climatology is presented. Traditional blocking indices and methodologies are revised and a new blocking detection method is designed. This algorithm detects ...