A severe winter storm continues to unleash treacherous conditions across the country this holiday weekend.

If you’re just now catching up, here are some of the storm’s latest developments:

Rising death toll: At least 15 people have died across multiple states, including New York, Wisconsin, Tennessee, Ohio, Kentucky, Kansas and Missouri.

Power outages: More than 1.7 million customers across the US are still without power as of Saturday morning, according to Poweroutage.Us. Before daylight on Saturday, utility companies were making progress on restoring power, but numbers could grow throughout the day as strong winds are forecast for much of the Midwest and Northeast. In states like North Carolina and Tennessee, residents are told to expect temporary power outages as the weather puts a strain on electricity providers.

Bitterly cold temperatures: More than 100 million people in the US remain under wind chill alerts Saturday morning. Some alerts have begun to expire across portions of the central and eastern regions of the country.

Holiday impacts: The winter storm has upended holiday travel for three consecutive days now, as airlines have canceled more than 9,000 flights in total between Thursday, Friday and advance cancellations on Saturday nationwide. More than 1,600 flights have been canceled so far Saturday across the country. Couriers including Amazon, the US Postal Service, UPS and FedEx are warning customers of disruptions to their operations in the final delivery day before Christmas due to the storm.