So, I've been playing with ECMWF ERA5 reanalysis data for 1950-2021. I thought it would be fun to go through some recent cold waves and find their closest historical analogs. The criteria here is the spatial pattern of 500mb GPH between 40-60N, and 140-110W. The magnitude of the actual heights won't be the same especially if a similar pattern occurred in a different season. For each pattern, I will list the date which I am trying to match (in bold), followed by its closest historical matche