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. 2021 Sep 1;5(9):e2021GH000451. doi: 10.1029/2021GH000451

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© 2021 The Authors. This article has been contributed to by US Government employees and their work is in the public domain in the USA.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Goddard Earth Observing System‐Forward Processing 36‐h forecast, initialized April 26, 2021, of additional indicators of a weather pattern conducive for a stratospheric intrusion to occur which could impact surface air quality in communities in the western USA. Total vertical column densities of O₃ panel (a) and upper‐level (500 hPa) relative humidity panel (b) were accessed from the FLUID website in April 2021. Satellite imagery of total VCD of O₃ from the OMPS instrument on the Suomi NPP satellite panel (c) and 500 hPa relative humidity from AIRS, aboard the Aqua satellite, were both accessed from Worldview in April 2021.