Image caption
The stratosphere and troposphere are finally talking to each other. Differences from average atmospheric thickness (“standardized geopotential height anomalies”) in the column of air over the Arctic for the stratosphere and troposphere. Since early March, there have been several instances when positive thickness anomalies extended throughout the stratosphere and troposphere, indicating coupling. Recent forecasts indicate that coupling will continue for at least the next two weeks. Standardized anomalies are based on departures from the 1991-2020 Climate Forecast System Reanalysis climatologies and have been divided by the standard deviation. Data are from the Global Forecast System observational analysis and forecast.