Yikes. High Resolution Rapid Refresh (HRRR) data has had the Great Lakes elevation incorrectly set to 0(meters) since the December 2020 update(!).
— Ryan Hickman (@ryanhickman) July 19, 2022
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