After sub-freezing temperatures were observed over northern Iowa on Wednesday morning, it is much of the rest of Iowa's turn this Thursday morning to terminate the growing season. The featured map presents counties under a Freeze Warning by the NWS at the time of this feature posting Thursday morning. Many counties to the south of the shown warning are under a Frost Advisory, which covers more marginal freezing temperature conditions. The Freeze/Frost NWS headlines can be a bit confusing this time of year as they are one-time products and can have local office variances on when they will be issued after assessments are made of previous freezing temperature events. For example, you don't see a Freeze Warning over the areas of northern Iowa that had such temperatures on Wednesday morning. Once the growing season is believed to be done for a county, there are no subsequent headlines issued for future events during the fall season.

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