This map shows the monthly streamfunction climatology and standardized anomalies at the 925, 500, and 250 hPa pressure level in the atmosphere using the 1991-2020 base period for the month shown.
Monthly streamfunction climatology values are shown as grey contours with a contour interval of 10E+06 m2/s; dashed contours represent negative values and solid contours represent positive values. Positive standardized streamfunction anomalies are shown in yellow and orange, and negative anomalies are shown in shades of blue, with shading starting at +/-1 standard deviations and a contour interval of 0.5 standard deviations.
Contact help@iri.columbia.edu with any technical questions or problems with this Map Room.