Thursday's forecast continues the risk of flash flooding across the entire state, with a higher probability of flash flooding across hard-hit South Florida. Combine these factors with heavy urbanization in eastern Broward and Miami-Dade Counties and the flash flood potential is compounded significantly. Storm motion was another significant factor in Wednesday's flash flood event across Broward and Miami-Dade Counties, as storms were nearly stationary at times. Research has shown a significant correlation between warm cloud depth and the potential for flash flooding, with many environmental case studies appearing similar to the atmospheric setup over South Florida Wednesday. The depth of cloud cover without ice, often called the warm cloud layer, was incredibly deep across South Florida Wednesday. This value, expressed in inches, was between 1.8 and 1.9 Wednesday evening across South Florida and signaled an incredibly high moisture content. Precipitable water refers to the amount of water vapor in a column of air if it were to be condensed. Another measure to determine saturation levels of the atmosphere is precipitable water, or PWAT. This degree of saturation in the low-levels is a classic signal that forecasters use to determine likelihood of heavy rain and flash flood potential. In the lower levels of the atmosphere, relative humidity values a few thousand feet off the ground were near 90 percent. The historic rainfall was made possible by several atmospheric ingredients coming together simultaneously. #flwx /5LIPDVedqr- NWS Miami April 13, 2023 Here is a map of the preliminary rainfall reports for 24 hours ending this morning. There were areas of South Florida that received prolific rainfall amounts yesterday, with the highest amounts of over 20 inches in coastal Broward County.
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