An unprecedented winter storm and unprepared electrical grid has left millions of Texans without reliable power and water and has killed at least 20 people since Monday. Rolling blackouts stretched into days, with more than 400,000 households still without power Feb. 18 as another storm looms Thursday.

The incoming storm is expected to have devastating effects, particularly in counties southwest of San Antonio where COVID-19 cases are already spreading significantly. About seven million people were told to boil water or stop using it entirely as pipes and water mains burst in the frigid temperatures.

Read more at PBS News.