Clyde Foster from South Africa reports on the apparation of a bright storm in Jupiter in the South Temperate Belt. The storm suddenly appeared as a bright compact spot South East of Jupiter's Great Red Spot on images acquired on 31 May 2020 at around 00:34 UT. While the storm is observable in most wavelengths, it is particularly well contrasted when using filters in the methane band at 890 nm where high clouds appear bright. As other convective storms its location is in a cyclonic region. Andy Casely from Australia obtained methane maps of the area one Jupiter rotation earlier confirming the sudden apparition of the storm.
Fast observations of Jupiter are requested to follow the evolution of this storm that could grow into a larger disturbance similar to the South Temperate Belt Disturbance developed in February 2018.
The storm is located at longitude 24º (System III) and planetographic latitude -33º. Juno will observe this specific area in 2 days but ground-based images in this period can help to measure the intensity of the convection in this storm. Previous similar storms have developed with different convective cores activating very closely on different days over the first 3-4 days of activity.