According to a statement from IPMA, on the islands of Flores and Corvo, which make up the Western group of the archipelago, the yellow warning for "sometimes heavy rainfall, which may be accompanied by thunderstorms" is valid between 9:00 pm local time (10:00 pm in Lisbon) today and 12:00 pm on Saturday.
For the Central group - islands of Faial, Pico, São Jorge, Graciosa, and Terceira - the same warning is in force from 12:00 to 24:00 on Saturday and for the islands of São Miguel and Santa Maria, which make up the Eastern group, it is in force between 00:00 and 15:00 on Sunday.