Any weak precipitation falling out of the high based showers likely evaporated in the dry air. Therefore a deeper layer of dry air at low levels allows a greater increase in temperature because the air continues to warm at the higher lapse rate for a longer period of time. The water vapor satellite loop during this time also showed a notch forming to the rear of the clouds over the Sioux Falls area indicating that drying and evaporation was occurring. The notch becomes more pronounced as the cloud mass moves into southwest Minnesota. Automated weather sensors over the tri state area recorded the effect of the heat burst.
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