The warning, enforced by the Met Office, will come into force at midnight and remain in place until 7pm on Saturday (October 4). The warning comes after another yellow warning covering Flintshire and the rest of North Wales was updated to come into force at 3pm today (October 3) until 11:59pm on Saturday. The Met Office has warned that bus and train services may be affected, with some journeys taking longer. The Met Office said: "If you are on the coast, stay safe during stormy weather by being aware of large waves. The Met Office added that weather warnings can change quickly, and it recommends staying up to date with the weather forecast in your area.