Friday will feature an abrupt end to our stretch of rather pleasant fall temperatures in Iowa with highs just in the 50s and a very cold Friday night and Saturday morning in store. The NWS will likely issue a Freeze Warning to cover much of the state as temperatures will dip well below freezing for the first time this season. The previous frost event was somewhat limited and hard freeze area even more limited, so thus the warranted headlines for this event. The Freeze Warning is only issued once for the fall season as once it happens, further events are inconsequential. The featured chart presents the timing of such events for Story County (Ames). The obvious nature of having these events during the overnight hours is readily apparent. Most of them go into effect after 1 AM and end by 9 AM.

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