The South American Monsoon System: Recent Evolution and Current Status Update prepared by Climate Prediction Center / NCEP 9 February 2015 For more information,

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The South American Monsoon System: Recent Evolution and Current Status

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The South American Monsoon System: Recent Evolution and Current Status

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The South American Monsoon System: Recent Evolution and Current Status Update prepared by Climate Prediction Center / NCEP 9 February 2015 For more information, visit:

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

Large rainfall deficits continue over central and southeastern Brazil During the last 7 days (2-8 February 2015), below-average precipitation was observed over the central and western Amazon Basin, eastern Bolivia, Uruguay and southern Brazil. Above-average precipitation was observed over portions of central and Southeast Brazil. For 9-15 February 2015, below-average precipitation is forecast for Central, Southeast and Northeast Brazil, and above-average precipitation is indicated for Colombia, Ecuador, northern Peru, southern Paraguay, northern Argentina and portions of southern Brazil. Highlights

Rainfall Total & Anomaly Patterns: Last 7 Days During the last 7 days, below-average precipitation was observed over the central and western Amazon Basin, eastern Bolivia, Uruguay and southern Brazil. Above-average precipitation was observed over portions of central and Southeast Brazil. TotalAnomaly

Rainfall Totals & Anomaly Patterns: Last 30 Days During the last 30 days, below-average precipitation was observed over portions of the eastern Amazon Basin, and all of central, southeastern and northeastern Brazil. Above-average precipitation was observed over central and southern Colombia, Ecudaor, northern Peru, western Bolivia, and portions of northern and central Argentina. TotalAnomaly

BP Recent Evolution: Rainfall Last 90 Days BP: Brazilian Plateau 90-day rainfall deficits are present over the southern Amazon Basin (~300 mm) and the Brazilian Plateau ( mm). 90-day rainfall is near average over southern Brazil.

Tropical Pacific and Atlantic SST Anomalies A weekly PowerPoint summarizing the ENSO Cycle: Recent Evolution, Current Status and Predictions is available at: SSTs are above average in most of the equatorial Pacific and near average in most of the equatorial Atlantic. (For details concerning El Niño – La Niña, go to the link below.)

Atmospheric Circulation Recent 7 days Upper panels: During the period of 31 Jan.-6 Feb. 2015, anomalous anticyclonic flow (stronger- than-average Bolivian High, center indicated by red A) was located over the central Andes mountains. Lower panels: Anomalous rising motion occurred over southeastern Brazil, consistent with the positive precipitation anomalies in this region (see Slide 4). 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. A

925-hPa Wind &Temperature Recent 30 DaysRecent 7 Days Low-level (~600 m above sea level) 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. During the 7-day period 31 Jan.-6 Feb. 2015, above-average temperatures covered portions of central and western Brazil, Paraguay, and northern and central Argentina.

NCEP/GFS Model Forecasts Bias-Corrected Precipitation Total Forecasts from 9 February 2015 – Days 1-7 Anomaly Note: Bias correction based on last 30-day forecast error.

NCEP/GFS Model Forecasts Bias-Corrected Precipitation Total Forecasts from 9 February 2015 – Days 8-14 Anomaly Note: Bias correction based on last 30-day forecast error.

For Days 1-7 (9-15 February 2015), below-average precipitation is forecast for Central, Southeast and Northeast Brazil, and above-average precipitation is indicated for Colombia, Ecuador, northern Peru, southern Paraguay, northern Argentina and portions of southern Brazil. For Days 8-14 (16-22 February 2015), above-average precipitation is indicated for the central Amazon Basin, and western Bolivia. Below- average precipitation is predicted for northern and central Peru, northern Argentina, and portions of southern and southeastern Brazil NCEP/GFS MODEL FORECASTS

Forecast Verification Forecast from 26 January 2015 Valid for 2-8 Feb Forecast from 2 February 2015 Valid for 2-8 Feb Observed 2-8 Feb. 2015

Climatology Rainy Season Dates ONSETDEMISE

Precipitation Climatology

Precipitation Climatology Animation