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This happened all the time last year in the Midwest. The last day of the forecast would often have a ridiculous spike, like forecasting 117F for the high in Chicago. Thing is, the GFS model would actually show that in its output for that day (and sometimes for a few days leading up to that). This is a common problem with the GFS overplaying heat waves that far out. The only thing I could figure is there is probably some amount of smoothing that happens in the app in the mid range forecasts when multiple models and climatology are available but then that last data point is only GFS and the temperature explodes. Surprised they haven’t fixed this yet.
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