October is forecast to end on a cold note across a large part of the country as a large pattern change takes shape. This pattern change will take shape by the end of the week, forcing cold air out of Canada into United States.
Numerical guidance, which is referred to as “computer models” by meteorologists, is a tool meteorologists use to help determine the future state of the atmosphere (i.e. what will happen in your area tomorrow or in 5 days). This guidance is indicating a equatorial dip in the jet stream across the central United States as the Eastern Pacific Ridge and Greenland Block establish, creating a “buckle” of the jet stream. This will force the jet stream south, allowing cold air to readily flow into central parts of the country.
The Climate Prediction Center (CPC) has highlighted the majority of central & western parts of the country for moderate to high probabilities of below average temperatures for days 6 through 10.
The CPC also has the same areas with moderate to high probabilities of below average temperatures for days 8 through 14, which will cross over from the end of October into the beginning of November.
Christopher Nunley is Meteorologist on Firsthand Weather, Lecturer in the Department of Geosciences at Mississippi State University (MSU), and a PhD Candidate (Earth and Atmospheric Sciences) at MSU. He earned his M.S. in Applied Meteorology at MSU, was an Assistant Cross Country Coach and taught at the University of North Texas, and was a Broadcast Meteorologist at KTEN-TV (just north of Dallas, Texas). Christopher’s main focus lies within teaching and inspiring prospective meteorology students, atmospheric research to further our understanding of atmospheric processes, and forecasting and analyzing extreme weather events to help save lives!