A Red Flag (Fire Weather) Warning was in effect Wednesday afternoon for much of northwestern Iowa. The NWS issues this headline when antecedent dryness is combined with dry vegetation and the atmospheric combination of low relative humidities and strong winds. As you can imagine, such a combination leads to ignited fires that can spread quickly. The featured chart presents a time series of relative humidity and wind speed reports for Spencer, IA on Wednesday. The duration of the Red Flag Warning is highlighted within the chart. You can see the warning covering the period of lowest relative humidity and strongest winds. By early evening, both conditions had relaxed and the warning was expired. More of the same will be possible for the remainder of this week.

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