Temperatures are dropping in central and south Texas Thursday through Friday morning as the state sees a cold front that may send temperatures plummeting as low as 18 degrees Fahrenheit (minus-8 degrees Celsius) in the Permian Basin on Thursday. These unusually chilly temperatures come just before the one-year anniversary of a historic winter storm that left stretches of the state without power for days—and could be a big test for the electric grid and natural gas supply.