Extensive collaboration between NWS Louisville and emergency managers and road departments in each county allowed identification of many areas prone to flash flooding. These locations were mapped and classified on a low-medium-high scale depending on the propensity for flooding. With the advancement of Geographic Information System (GIS) programs in the 2000s, the maps were converted to GIS shapefiles and incorporated into webpages and the NWS's Advanced Weather Interactive Processing System (AWIPS) for easy access by warning forecasters. Recently, past flood fatalities at hotspots were incorporated into the dataset.
The next step will be to work with emergency managers and road departments to identify changes to hotspot locations that have occurred in the years since the project's inception. This presentation will discuss the evolution of the flash flood hotspot project and how NWS Louisville forecasters incorporate critical data to more effectively communicate flash flood risks to customers.