Does rainfall after a dry spell cause slippery road conditions?
By Ryan Thorpe
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YES
Rainfall after dry periods can cause oil buildup on road surfaces over time, creating dangerous driving conditions, according to the National Oceanic and Atmospheric Administration.
Without rain, built up oil from cars and trucks isn’t washed away. It remains on the road, accumulating over time, and only washes away when the next rainfall arrives. Oil mixing and floating above water can create a sheen of rainbow on top of the road, according to NOAA.
In June and July, Fort Worth had 42 days without rain. The longest stretch of dry weather took place between June 12, 2024, and July 4, 2024, according to the National Weather Service.
Oil buildup on roads takes two days to appear, according to NOAA.
This fact brief is responsive to conversations such as this one.
Sources
National Oceanic and Atmospheric Administration Oil, Water, and the Dangers of Spring Showers
Alabama Department of Environmental Management Leaking Oil On Street
National Weather Service Climate
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