These maps show monthly vector wind anomalies at various pressure levels in the atmosphere using the 1991-2020 base period for the month shown.
To produce the wind anomaly vectors, the zonal and meridional monthly wind anomalies are computed separately. Vectors show the resultant wind anomaly direction, and the vector length indicates the magnitude of the resultant wind anomaly. A vector scale in the lower-right-hand corner of the map indicates the length of the vector for a given speed, in units of m/s. Resultant wind speed anomalies are also indicated by a color scale and contours, graduated at an interval of 3 m/s.
Contact help@iri.columbia.edu with any technical questions or problems with this Map Room.