I know I'm being picky here, but ... you have SG in February. Typically the ice on the Great Lakes doesn't start breaking up until March.
"Your friends have been trying to visit you for several weeks, but the lake ice has held unusually long this year. Alas.”
Butcher, Jim (2014-05-27). Skin Game: A Novel of the Dresden Files (p. 9). Penguin Group US. Kindle Edition.
This year, they brought in an Ice Breaker to break the ice. I could totally see the ice being a problem until late March or early April if Mab is taking a hand in it.