I hate to sound like a broken record but that is the nature of buried Persistent Weak Layers. Faceted snow from January still has the minor possibility of causing a dangerous avalanche. 9 out of 10 slopes will stay in place. One may not. What I've learned about buried facets over the years is that they often cause an avalanche long after you think conditions have completely stabilized. Very steep northerly-facing high-elevation slopes are the only places you may find trouble.