Stationary tornadic storms dumped 2 feet of rainfall over south Florida this week. A deep analysis of what happened and 4 important lessens.
examined precipitation efficiency in Florida storms along convergence boundaries so this brought back scholarly memories. I should mention that convergence was certainly part of the story here too as a frontal system was draped across the state.at 8 pm EDT sounded the alarm with some wording that would get any meteorologist’s attention.
This storm was no different. Intense rainfall is certainly one of the ingredients required for this type of event. Scientists are nowIt gives people the impression that this event can only happen every 1000 years. However, Jonathan Erdman, a senior meteorology with IBM/The Weather Company, nails the problem in the Tweet below. According to the, “In terms of probability, the 1,000-year flood has a 0.1% chance of happening in any given year.
However, I digress. Let’s get back to the other ingredients. Impervious surfaces in urban environments fundamentally alter the natural water cycle. They cause increased surface runoff and a reduction of infiltration into the ground. The images below of inundated roads or airport runways are stark examples of anthropogenic modification to the water cycle.
Experts have warned us for years that the stormwater engineering for cities was designed under the fatal assumption of “stationarity.” What does that mean?
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