Individual analysis by river basin

Iriri River Basin

Updated on November 19, 2025

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 136 and 159 mm being considered normal (reference quantiles 42.5% and 57.5%). On November 19, 2025, 73 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 -2.3, classifies the basin as very dry condition. In the coming weeks, climate behavior indicates a increase in rainfall volumes, the sub-seasonal forecast model suggests very dry behavior or a tending to be very dry.

Climatology

136 mm - 159 mm

Observed 30 days

73 mm

Anomaly index

-2.3

Basin classification

very dry condition

Forecast

very dry behavior or a tending to be very dry