Tropical Storm Blanca – (Per Wikipedia) On May 24, 2021, the National Hurricane Center first noted an area of low pressure to develop south of the coast of Mexico for possible tropical cyclogenesis. Four days later, a low-pressure area finally formed a couple of hundred kilometers south of the country. The low was initially embedded within a large monsoon trough and was interacting with another system to its east.
However, as it gradually moved west-northwestwards, the system became more organized and better defined and by 21:00 UTC on May 30, was classified as Tropical Depression Two-E. The depression continued to gradually become more symmetric, despite its displaced low- and mid-level circulations. The next day, Two-E strengthened to a tropical storm and received the name, Blanca.
A relatively compact cyclone, Blanca quickly gained strength throughout the day of May 31, reaching its peak intensity at 09:00 UTC on June 1 with winds of 60 mph (95 km/h) and a pressure of 998 mb (29.47 inHg). Shortly afterwards, vertical wind shear weakened Blanca as its low-level circulation became partially exposed on satellite images later into the day. Blanca continued to weaken on June 2 due to wind shear and the entrainment of dry, stable air into its circulation. Blanca further weakened into a tropical depression later that day. Blanca degenerated into a post-tropical cyclone early on June 4 as thunderstorm activity dissipated completely.