Winter storm watches, warning or advisories are posted in at least 40 states and cover around 160 million people, or half the US population.
Here's a look at the snowfall in some key cities across Texas, Oklahoma and Louisiana:
- Snow fell as far south as Brownsville, Texas, where measurable snow has only occurred on two days since records began in 1898.
- In Lake Charles, Louisiana — which saw two direct hits from hurricanes in the past six months — there was thundersnow this morning.
- Oklahoma City and Dallas saw top-10 daily snowfalls yesterday (6 inches and 4 inches respectively), and both could see another top-10 snowfall on Tuesday or Wednesday.
- Abilene, Texas, reported 14.8 inches of snow on Sunday, smashing their record for most snow ever in a day, which was previously 9.3 inches from 1996.