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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 forecasts of indicators of a stratospheric intrusion which could impact surface air quality in communities in the western USA. Upper‐level (500 hPa) temperature (a), wind speed (b), vertical pressure velocity (c), and potential vorticity (d) are accessed from the Framework for Live User‐Invoked Data (FLUID) website (April 2021). Forecasts are initialized at 12 UTC on April 26, 2021 and valid for 00 UTC on April 28, 2021. Note that “00z” in the FLUID images are short‐hand for Universal Time Coordinates (UTC), and Pacific Daylight Time is −7 h offset from UTC.