By Sunday night, over 1,000 flights in the U.S. scheduled for Monday were delayed, with approximately 250 cancellations, as a result of the anticipated Christmas blizzard conditions across large portions of the Northern and Central Plains and Upper Midwest regions, according to NPR.

According to the NPR report, South Dakota and Nebraska are expected to experience significant snowfall starting early Monday morning. Most areas will receive over 4 inches of snow, while some parts of south-central and central South Dakota can expect at least twelve inches. In addition, residents in the northern regions can anticipate sleet. These snow and ice accumulations, combined with freezing rain and strong winds, are expected to create dangerous travel conditions.

The National Weather Service has issued advisories, warning about the potential for isolated power outages in the area. Wind gusts of up to 55 miles per hour could bring down tree branches and power lines, further exacerbating the disruption caused by the Christmas blizzard.

Meanwhile, the National Oceanic and Atmospheric Administration (NOAA) has forecasted that the warm Pacific weather pattern known as El Niño will result in warmer-than-usual temperatures and increased precipitation over the Christmas period for the rest of the country. This stands in stark contrast to the wintry conditions expected in South Dakota and Nebraska.

As the Christmas blizzard threatens the Northern Plains with significant snowfall, residents in the affected regions are being advised to exercise caution and stay informed about weather updates. Travelers should stay updated on flight statuses and make necessary arrangements, as the disruptions are expected to continue throughout the affected areas.