Areas north of Houston and Harris County are under a tornado watch through 6 p.m. Sunday as a powerful cold front slices through Southeast Texas.

A freeze warning has been issued for most of Southeast Texas as a blast of stinging cold is expected to arrive Sunday night, with temperatures remaining in the 20s, 30s and 40s through much of the week.

ERCOT issued a weather watch for Monday through Friday due to forecasted cold weather across the region combined with high levels of demand and the potential for lower reserves. An arctic front is plunging through North Texas,