Another day another record , another 1,000 year event.
https://www.delawareonline.com/story/news/2020/08/07/friday-storm-delaware-isaias-delmarva-power-flooding-rain/3324504001/
The Delaware Environmental Observing System measured 1.03 inches of rain in just five minutes at its Greenville station near Winterthur, state climatologist Dan Leathers said.
According to the NOAA Atlas-14, the document that the National Weather Service uses to examine these types of events, that amount of rain in five minutes would be expected less than once every 1,000 years, Leathers said.
Leathers said he and his team were still looking at the storm in more detail Friday night.
The storm dumped more than four inches of rain at that Greenville station in around 30 minutes, Leathers said, and the area near Hockessin Fire Co. saw more than three inches of rain. So, too, did the Claymont area.
As of 1130 p.m., more than 11,000 Delmarva Power customers were without power.
It all happened quickly.
The National Weather Service issued a severe thunderstorm warning at 5:38 p.m., when a storm with wind gusts of 60 mph and the potential for hail was over Kennett Square, Pa., just over the Pennsylvania state line.