This animated JET STREAM FORECAST shows how the northern and southern streams are to combine or "phase" to generate the vertical motions in the atmosphere which will drop Central U.S. barometric pressures precipitously---generating wind and significant precip in the process. The color scheme highlight wind velocities. Note how a powerful phased "wind max" develops aloft over the Central U.S. in this animated forecast. It's that wind max that is to drive rapid intensification of the winter storm

50K views · 452 reactions | A change in the #jetstream brings a big change in the weather this week. Watch how the warm continental air is pushed aside as cooler Atlantic air spills in from the west. Some places will see maximum temperatures fall by more than 10 degrees! | Met Office | Facebook