“Northern Horn of Africa Faces Severe Drought Threat as GHACOF Predicts Below-Normal June-September Rainfall”

(Stronger because: “Severe Drought Threat” adds urgency, “GHACOF” clarifies authority, and “Northern Horn of Africa” specifies location while keeping SEO power.)

Alternatively:

“Ethiopia, Sudan, South Sudan at Risk as Climate Forum Warns of Critical June-September Rainfall Shortages”

(More targeted by naming high-risk countries and emphasizing “critical” impact.)