In May-July 2019, an estimated 6.96 million people (61% of the population) are likely to face Crisis (IPC Phase 3) acute food insecurity or worse, out of which an estimated 1.82 million people will face Emergency (IPC Phase 4) acute food insecurity and 21,000 will likely be in Catastrophe (IPC phase 5) . This is historically the highest number of people in South Sudan ever to face Crisis (IPC Phase 3) acute food insecurity or worse. Compared to the January 2019 projection analysis of the May-July 2019 period, the May 2019 IPC update estimates that in the same period, an estimated 81,000 people are likely to slip into Crisis (IPC Phase 3) acute food insecurity or worse. This deterioration is largely associated with the delayed rainfall that is expected to affect the improvement in the availability of wild foods, fish and livestock products. Of the people estimated to be in Catastrophe in May-July 2019, 10,000 are in Canal/Pigi of former Jonglei State, 10,000 are in Cueibet of former Lakes State, and 1,000 are in Panyikang of former Upper Nile State.