During Californian floods, Mexico becomes unusually dry

While news headlines have focused on the atmospheric rivers that flooded parts of California this winter, few have noticed that the North American monsoon region has become unusually dry. Each year, the North American monsoon brings crucial rainfall to western Mexico and the southwestern United States … read more

Current monsoon season’s rainfall anomaly:

The above map shows the anomalous rain accumulation for the current season (southern hemisphere summer). You can also see animations of rainfall anomalies during previous seasons.

Data comes from the U.S. Climate Prediction Center’s Unified Gauge-based Analysis of Global Daily Precipitation. The above anomaly is accumulated from the start of the current summer season and computed relative to a daily climatology from 2006-2015.

Monsoons are:

  • continental-scale circulations that deliver water to billions of people
  • a seasonal reorganization of global atmospheric flow that is driven by the sun
  • dominant climate features in Africa, Asia, Australia, and the tropical Americas