Individual analysis by river basin

Basins on the left bank of the Amazon River (Amazonas State)

Updated on February 4, 2026

Accumulated precipitation vs climatology

30 days
chart

Comparison between climatological quantiles and observed accumulation.

Anomaly and trend

14 to 28 days
chart

Anomaly, forecast and observed indicators.

Basin highlights

The climatology of the period under analysis indicates rainfall with records varying between 172 and 205 mm being considered normal (reference quantiles 42.5% and 57.5%). On February 4, 2026, 176 mm of average accumulated precipitation was observed over the basin in 30 days, the calculation of the average of the categorized anomaly index in the basin area the value of -0.2, classifies the basin as normal contition. In the coming weeks, climate behavior indicates a increase in rainfall volumes, the sub-seasonal forecast model suggests behavior close to normality or a tending to be dry.

Climatology

172 mm - 205 mm

Observed 30 days

176 mm

Anomaly index

-0.2

Basin classification

normal contition

Forecast

behavior close to normality or a tending to be dry