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RISObservational Evidence of Kelvin Waves in the Tropical Stratosphere
Publisher: American Meteorological Society
Abstract: This study of synoptic-scale wave motions in the equatorial stratosphere is based on the analysis of six months of radiosonde data from three tropical stations. Fluctuations in the zonal wind with an average period of 15 ...
The Nonlinear Behavior of Atmospheric Kelvin Waves
Publisher: American Meteorological Society
Abstract: The atmospheric Kelvin wave is modeled with nonlinear terms included. Forcing from below leads to a Kelvin wave similar to that observed. The nonlinear terms lead to an asymmetry in the wave, producing a zone of strong ...
An Alert Classification System for Monitoring and Assessing the ENSO Cycle
Publisher: American Meteorological Society
Abstract: An alert classification system for the ENSO cycle is introduced. The system includes watches, advisories, and a five-class intensity scale for warm and cold phases of the ENSO cycle. A watch is issued when conditions are ...
Changes in Observed Daily Precipitation over the United States between 1950–79 and 1980–2009
Publisher: American Meteorological Society
Abstract: hanges in observed daily precipitation over the conterminous United States between two 30-yr periods (1950?79 and 1980?2009) are examined using a 60-yr daily precipitation analysis obtained from the Climate Prediction ...
On the Interaction Between Kelvin Waves and the Mean Zonal Flow
Publisher: American Meteorological Society
Abstract: The descent of westerly wind regimes of the quasi-biennial oscillation in the equatorial stratosphere is marked by two regions of strong zonal wind fluctuations in the 8?20 day period range: one in the easterly regime below ...
The South America Monsoon Circulation and Its Relationship to Rainfall over West-Central Brazil
Publisher: American Meteorological Society
Abstract: The mean atmospheric circulation for the rainy season over west-central Brazil (20°?10°S, 60°?50°W) is investigated for a 21-yr period (July 1979?June 2000). The NCEP?NCAR reanalysis, pentad outgoing longwave radiation ...
Downstream Weather Impacts Associated with Atmospheric Blocking over the Northeast Pacific
Publisher: American Meteorological Society
Abstract: Relationships between atmospheric blocking over the Alaskan region of the northeast Pacific, referred to as Alaskan blocking, and weather extremes over North America during boreal winter 1979?2000 are examined. A total of ...
Extreme Precipitation Events in the South-Central United States during May and June 2010: Historical Perspective, Role of ENSO, and Trends
Publisher: American Meteorological Society
Abstract: n analysis of extreme daily precipitation events that occurred in the south-central United States during May and June 2010 is carried out using gridded station data and reanalysis products in use at the National Centers ...
Relationships between Climate Variability and Winter Temperature Extremes in the United States
Publisher: American Meteorological Society
Abstract: Time series representing two of the climate systems leading patterns of variability, namely El Niño?Southern Oscillation (ENSO) and the Arctic Oscillation (AO), are used together with 50 yr of daily mean surface air ...
Comparison of Daily Precipitation Statistics for the United States in Observations and in the NCEP Climate Forecast System
Publisher: American Meteorological Society
Abstract: An intercomparison of the statistics of daily precipitation within seasonal climate over the conterminous United States is carried out using gridded station data and output from the NCEP Climate Forecast System (CFS). ...