http://www.eas.slu.edu/CIPS/ANALOG/analog.php
http://www.eas.slu.edu/CIPS/ANALOG/DFHR.php?reg=EC&fhr=F036&rundt=2018030612
Top left click top analogs
Gives complete breakdown of them, including notable snowfall amounts, impactful events. It's my favorite weather website. You can use it for severe weather, snowstorms, anything basically.
It gives the indices relative to the upper level pattern that coincides with the synoptic storm. Correlation coefficient as well.