(Des Moines) State Climatologist Dr. Justin Glisan says winter is finally on its way. He explains that a low-pressure system tracking through St. Louis will cause a cold air outbreak and possibly significant snowfall across extreme southern Iowa.
Dr. Glisan notes that the significant atmospheric feature affecting the Midwest is the presence of cold temperatures. He explains that the Polar Vortex has destabilized, which is similar to a dam breaking, allowing cold air to flow further south, and this is precisely what is occurring. Looking ahead, Dr. Glisan mentions that the 6-10 and 8-14-day forecasts, which extend through the middle of January, indicate a higher probability of unseasonably cold temperatures.
The latest drought monitor reveals no improvement or degradation overall in drought conditions. However, Dr. Glisan indicates some abnormal dryness in southwest Iowa, which reflects the dry fall season. Iowa experienced its driest September and the 51st driest October, followed by some much-needed moisture in November and December.
