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The South American Monsoon System: Recent Evolution and Current Status

Stay updated on the latest evolution of the South American Monsoon System with highlighted precipitation patterns, forecasts, and climatology data. Get insights on rainfall anomalies, atmospheric circulation, and model forecasts.

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The South American Monsoon System: Recent Evolution and Current Status

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  1. The South American Monsoon System: Recent Evolution and Current Status Update prepared by Climate Prediction Center / NCEP 4 June 2012 For more information, visit:http://www.cpc.ncep.noaa.gov/products/Global_Monsoons/American_Monsoons

  2. Outline • Highlights • Recent Evolution and Current Conditions • NCEP/GFS Model Forecasts • Climatology

  3. Highlights • During the last 7 days, above-average precipitation was mainly observed over eastern Colombia, and below-average rainfall was found over the other places to the north of 7S and Uruguay. • For 4-10 June 2012, below-average precipitation is predicted for Peru, extreme southern Brazil, and most of the regions to the north of 5S except the above-average precipitation over central Colombia. Above-average precipitation is also predicted for southwestern and southern Brazil. • For 11-17 June 2012, below-average precipitation is predicted for most of northern and northwestern South America and extreme southern Brazil, and above-average precipitation is predicted for central Colombia and portions of eastern Argentina.

  4. Rainfall Total & Anomaly Patterns:Last 7 Days Total Anomaly During the last 7 days, above-average precipitation was mainly observed over eastern Colombia, and below-average rainfall was found over the other places to the north of 7S and Uruguay.

  5. Rainfall Totals & Anomaly Patterns:Last 30 Days Total Anomaly During the last 30 days, above-average precipitation was mainly observed over central Colombia and portions of northwestern Brazil, eastern Bolivia, and eastern Argentina. Below-average rainfall occurred over most regions to the north of 10ºS, extreme southern Brazil, and Uruguay.

  6. BP Recent Evolution: RainfallLast 90 Days BP: Brazilian Plateau • 90-day rainfall totals are clearly below average over the southern Amazon basin, the Brazilian Plateau (core monsoon region), and southern Brazil.

  7. Tropical Pacific and Atlantic SST Anomalies Above-average SSTs are observed in much of the equatorial Pacific Ocean. (For more details concerning El Niño – La Niña, go to the link below.) A weekly PowerPoint summarizing the ENSO Cycle: Recent Evolution, Current Status and Predictions is available at: http://www.cpc.noaa.gov/products/precip/CWlink/MJO/enso.shtml

  8. Atmospheric Circulation Recent 7 days • Upper panels: During the period of 27 May – 2 June 2012, in the upper troposphere, an anomalous anticyclonone (red A) was observed over west coastal regions of subtropical South America and an anomalous cyclone (red C) was seen over western Brazil. • Lower panels: Anomalous sinking motion (positive omega) was observed over western Argentina, and anomalous rising motion (negative omega) occurred over northwestern South America and southern-southeastern Brazil. C A Rising motion (negative omega, yellow/red shading), usually associated with wetter- than-normal conditions. Sinking motion (positive omega, blue shading), usually associated with drier-than-normal conditions.

  9. 925-hPa Wind &Temperature Recent 30 Days Recent 7 Days • During the 7-day period of 27 May – 2 June 2012, temperatures were above average over much of the central and eastern South America. Low-level (~600 m) wind and temperature anomalies based on the NCEP Climate Data Assimilation Systems (CDAS) analysis. The patterns of anomalous temperature and wind at 925-hPa are usually similar to surface observations. Note: Areas with surface pressure below 925-hPa are masked out.

  10. NCEP/GFS Model Forecasts Bias-Corrected Precipitation Forecasts from 4 June 2012 – Days 1-7 Total Anomaly Note: Bias correction based on last 30-day forecast error.

  11. NCEP/GFS Model Forecasts Bias-Corrected Precipitation Forecasts from 4 June 2012 – Days 8-14 Total Anomaly Note: Bias correction based on last 30-day forecast error.

  12. NCEP/GFS MODEL FORECASTS • For Days 1-7 (4-10 June 2012), below-average precipitation is predicted for Peru, extreme southern Brazil, and most of the regions to the north of 5S except the above-average precipitation over central Colombia. Above-average precipitation is also predicted for southwestern and southern Brazil. • For Days 8-14 (11-17 June 2012), below-average precipitation is predicted for most of northern and northwestern South America and extreme southern Brazil, and above-average precipitation is predicted for central Colombia and portions of eastern Argentina.

  13. Forecast Verification Forecast from 21 May 2012 Valid 28 May – 3 Jun 2012 Forecast from 26 May 2012 Valid 26 May – 1 Jun 2012 Observed 28 May – 3 Jun 2012

  14. ClimatologyRainy Season Dates ONSET DEMISE

  15. Precipitation Climatology

  16. Precipitation Climatology Animation

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