As a slug of polar vortex-fueled arctic air overtakes the eastern two-thirds of the U.S. next week, a storm system could bring snow, sleet and freezing rain to places deep in the heart of Texas, but the forecast isn’t a lock just yet.

The timeframe would be Thursday morning into Friday with snow and ice being the main concern for areas north of Houston.

As North Texas expects below-freezing temperatures starting Saturday, there are questions as to how it will affect a stacked weekend of big events, such as the Fort Worth Stock Show and Rodeo and MLK parades.