Tropical Storm Hernan was a small and disorganized tropical cyclone that brought widespread flooding and destructive mudslides to several states in southwest Mexico in late August 2020. Hernan was the thirteenth tropical cyclone and eighth named storm of the 2020 Pacific hurricane season. A tropical storm formed from a low-pressure area that was located southwest of Mexico on August 26. Moving generally northward and paralleling the west coast of Mexico, the system was hindered by a high wind shear environment and barely strengthened. The cyclone achieved peak intensity around 6:00 UTC on August 27 with 45 mph (75 km/h) winds and a minimum barometric pressure of 1001 millibars (29.56 inHg). Passing just offshore the state of Jalisco, Hernan turned west and degenerated to a remnant low on August 28. The low moved near the Baja California Peninsula a couple hours later and dissipated shortly thereafter. Despite Hernan's short existence, it dropped over of rain across many areas of southwestern Mexico, with accumulation peaking at in Jalisco. Multiple highways had to be shut down due to dangerous conditions, including mudslides and rivers overflowing their banks. Several schools suffered damage in the state of Colima, and in the city of Manzanillo, homes, businesses, and streets were damaged and covered in mud. Nearly 20,000 people were heavily impacted by Hernan in Jalisco, and 1,674 homes and nine schools suffered severe damage. In that state, a man fell off his roof and died while inspecting it for damage following the storm. An additional person was reported missing in Guerrero. Total damage in Mexico is unknown. Meteorological history On August 17, the National Hurricane Center (NHC) first noted the potential for an area of low pressure to form off the southwest coast of Mexico in the following days. At the time, Hurricane Genevieve was in the proximity of the predicted area of formation. After Genevieve moved away and dissipated, the surrounding monsoon trough became active in response, and the disturbance's formation chances gradually increased. Aided by a favorable pulse of the Madden-Julian Oscillation (MJO), a broad area of low pressure developed as forecast on August 20. Easterly wind shear and the disturbance's broad size inhibited its development initially; atmospheric convection began to increase on August 24. Finally, at 06:00 UTC on August 26, the system had enough well defined deep convection to become a tropical storm, about southwest of Cabo Corrientes. The NHC noted at