Two non-developing systems racing west
Friday 19th June 2020
Disturbance Nine is about a day's steaming east of Trinidad, westbound at a sprightly 24 knots. Irrespective of upper level shear, it won't develop vertical convection at this speed anyway and aerial imagery shows very disorganised cloud formation. Nonetheless, this will bring heavy rain and the odd thunderstorm to the Windward Islands and coastal south America through the weekend. This is what is termed ‘summer' in the United Kingdom.
Disturbance Twelve is two days west of the Cape Verde Islands, also racing west. Dry air, excessive ground speed and upper level shear on the horizon will prevent this developing.