GMAO Snapshot – The Abnormally Hot June 2021 in the Western U.S.: A MERRA-2 Perspective

An extreme heat wave occurred over much of the western U.S. and southwestern Canada in late June 2021. The Global Modeling and Assimilation Office (GMAO) used daily and monthly near-surface temperature from MERRA-2 Reanalysis — run at the NASA Center for Climate Simulation (NCCS) — to compare the hot conditions of this year with the previous 40 years.

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Spatial pattern of near-surface temperature anomaly of June 2021 relative to 1981–2020 over the western U.S.”>