This dataset consists of 5-minute precipitation accumulation for a 48-hour period for a simulation with 24-hour forecast lead time ahead of an impactful event. This simulation from the Weather Research and Forecasting (WRF) model (Version 4.3) features 100 ensemble members for two storm events on a 1-km horizontal grid for a Southern California study area (see "Cartographic" section below). The selected storm events are: 1) 12 UTC 8 January 2018 to 12 UTC 10 January 2018, providing a 24-hour forecast leading up to the debris flow event that occurred at approximately 12 UTC 9 January 2018 on the Thomas Fire burn area in Montecito, California, as well as 24 hours following the event. 2) 12 UTC 1 February 2019 to 12 UTC 3 February 2019, providing a 24-hour forecast leading up to the enhanced runoff event that occurred at approximately 12 UTC 2 February 2019 on the Thomas Fire burn area in Montecito, California, as well as 24 hours following the event. Details of the configuration of the WRF ensemble simulation are provided in the associated publication and the readme file.