That is "Heavy Snow warning" criteria. Blizzard is sustained winds of 35 mph for 3 hours or more with heavy snow
A blizzard warning (SAME code: BZW) is an advisory issued by the National Weather Service of the United States which means sustained winds or frequent gusts of 35 mph / 15 m/s or greater with heavy snow is forecast for a period of 3 hours or more.
https://www.weather.gov/phi/WinterWx#:~:text=A Winter Storm Warning is,sleet is expected to occur.&text=A Blizzard Warning is issued,for at least three hours.