Interannual Variability of the North American Warm Season Precipitation Regime

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Abstract
Interannual variability of the North American warm season–precipitation regime is examined in three regions of the United States and Mexico: Arizona–New Mexico, northwest Mexico, and southwest Mexico. Daily observed precipitation over the United States and Mexico for a 26-yr (1963–88) period and various fields from the National Centers for Environmental Prediction–National Center for Atmospheric Research Reanalysis are used to compare and contrast hydrologic conditions and atmospheric circulation features associated with early, late, wet, and dry monsoons in each region. Relationships between anomalous monsoon behavior and the El Niño–Southern Oscillation phenomenon are examined. Some factors associated with the atmosphere’s lower boundary conditions that might influence the interannual variability of the warm season precipitation regime are discussed. The mean seasonal evolution of the North American monsoon system is characterized by the regular northward progression of heavy precipitation from... Abstract Interannual variability of the North American warm season–precipitation regime is examined in three regions of the United States and Mexico: Arizona–New Mexico, northwest Mexico, and southwest Mexico. Daily observed precipitation over the United States and Mexico for a 26-yr (1963–88) period and various fields from the National Centers for Environmental Prediction–National Center for Atmospheric Research Reanalysis are used to compare and contrast hydrologic conditions and atmospheric circulation features associated with early, late, wet, and dry monsoons in each region. Relationships between anomalous monsoon behavior and the El Niño–Southern Oscillation phenomenon are examined. Some factors associated with the atmosphere’s lower boundary conditions that might influence the interannual variability of the warm season precipitation regime are discussed. The mean seasonal evolution of the North American monsoon system is characterized by the regular northward progression of heavy precipitation from...

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