They are not saying anything about the front(onda tropical) that's hugging the coast down around Oaxaca..probably just a localized thunderstorm?

https://www.tropicaltidbits.com/sat/satlooper.php?region=epac&product=ir

https://smn.conagua.gob.mx/es/animacion-imagenes-de-satelite?satelite=GOES%20Este&nombre=Regi%C3%B3n%20IV&tipo=Tope%20de%20Nubes