Yikes. High Resolution Rapid Refresh (HRRR) data has had the Great Lakes elevation incorrectly set to 0(meters) since the December 2020 update(!).
NWS NCEP corrected the issue today at 12Z.
Seems like areas surrounding the Great Lakes may benefit Greatly (sorry) from this. pic.twitter.com/Cn7So6s71n

— Ryan Hickman (@ryanhickman) July 19, 2022