Arctic Blast via Polar Vortex to Chill 42 US States
By Kristina Pydynowski, Senior Meteorologist
November 9, 2014; 11:35 AM ET
Only the Southwest, Hawaii, Alaska and South Florida will escape the grip of the upcoming arctic blast that the polar vortex can be blamed for.
"The polar vortex is a large pocket of very cold air, typically the coldest air in the Northern Hemisphere, which sits over the polar region," stated AccuWeather.com Senior Meteorologist Alex Sosnowski.
"Occasionally, this pocket of very cold air can get dislodged farther south than normal, leading to cold outbreaks in Canada and the U.S."
For this current outbreak, the harshest cold in relation to normal will encompass the northern Rockies and Plains. However, temperatures will also plummet throughout the Northwest and to the Gulf Coast and I-95 corridor.
The arctic blast will drop into the northern Rockies on Monday, accompanied by a snowstorm on its leading edge, then will spread across the Northwest and Plains through Wednesday.
Latest Snowfall Forecast for North Central US
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Later in the week is when the cold will reach the I-95 corridor, but it will not be of the same magnitude as earlier in the week.
Many communities across the northern Rockies and Plains will experience a 20- to 40-degree drop in high temperatures from one day to the next.
Tuesday and Wednesday will prove to be the coldest days of the week across the northern Rockies and northern High Plains, where highs will be held to the teens with subzero lows.
Jeffrey L. Frischkorn