Phase shifts in extreme temperatures on Lake Michigan (IMAGE)
Caption
The frequency and intensity of heatwaves and cold spells in the Great Lakes, seen as spikes in these graphs, entered a new regime in the 1990s, according to new research led by the University of Michigan. Using a measurement called degree days that combines the magnitude and duration of a temperature anomaly, the researchers showed the median value more than doubled following a "phase shift" shown as a red line (similar plots are available for all of the Great Lakes).
Credit
Adapted with permission from Abdelhady, H.U., et al. Commun Earth Environ, 2025, DOI: 10.1038/s43247-025-02341-x (Used under a CC BY 4.0 license)
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CC BY