Atmospheric Scientist here at Weather Underground, with serious nerd love for tropical cyclones and climate change. Twitter: @WunderAngela
By: Angela Fritz , 9:50 PM GMT on January 25, 2013
In this visualization from the National and Atmospheric Administration, a drop in the jet stream sent temperatures across the United States plummeting over the Martin Luther King Jr. Holiday weekend. The pronounced change in temperatures can be seen in this weather data from NOAA/NCEP's Real-Time Mesoscale Analysis. Areas colored blue are below freezing. The diurnal cycle of heating and cooling can be seen over time, but the pattern is clear: much of the U.S. is pretty cold.
According to the National Climatic Data Center and Wunderground Record Extremes, 485 cold records have been set in the U.S. since January 14th.
More on the cold:
Winter's Icy Grip
Ice, Sleet, and Snow Headed to Midwest This Weekend
Low Winter Snowfall Spikes Drought Fears
The views of the author are his/her own and do not necessarily represent the position of The Weather Company or its parent, IBM.