From the National Weather Service:
The next round of lake effect snow...complete with thundersnow at times...will move across the Niagara River and into Niagara County and Orleans County between 9 and 10 p.m. This band will then quickly move south into northern Erie County and Genesee County. Conditions will rapidly deteriorate with this band. Snow rates are forecast to be around 1 to 2 inches per hour...although the band will not linger very long in the lakeshore counties. The band will then cross the north towns before midnight and settle roughly over the same area that was hit hard earlier this week. This band will intensify toward daybreak with snow rates again expected to approach 3 inches per hour or higher during the morning commute. Please heed all existing driving bans and if you must
travel, carry a survival kit.