With temperatures on the rise, Justin Glisan, state climatologist with the Iowa Department of Agriculture and Land Stewardship, warns of fog.
Glisan said Wednesday’s low in Creston was 22 below zero, which was reported from Creston Municipal Airport. The temperature has risen to single digits this morning and will continue to rise before topping off in the mid 50s Sunday before dropping again. Glisan said this kind of variability is typical, but not common, after that type of polar intrusion experienced this week in Iowa and across the Midwest.
“Having that 70, 75 degree swing, we don’t see that very often,” said Glisan.”It’s been 22 years since we’ve had a cold snap like this.”
Glisan said the snowcover that remains in parts of Union County can melt rapidly and create fog under these circumstances. As the warm, humid air mass flows over the snow, the snow will lower the temperatures of the humid air and create fog. This fog can decrease visibility on the roads.