Overview

• Yellow alerts cover eastern Northern Ireland from 7am to 7pm and western and southern Scotland from 8am to midnight, including Highlands and Eilean Siar, Strathclyde, south‑west Scotland and the Lothian Borders.
• Met Office guidance flags 30–50mm of rain widely, with up to 50mm in parts of eastern Northern Ireland and 60–70mm possible in south‑west Scotland, raising the risk of local flooding.
• Forecasters warn of slower bus and train journeys and potential interruptions to power supplies as the heaviest rain becomes persistent at times.
• Satellite guidance shows the main rain band moving east overnight, with brighter conditions and a few western showers expected on Sunday.
• Looking ahead, the Met Office signals a northwest–southeast split next week and says Hurricane Humberto’s Atlantic transition could bring a windier, more unsettled spell around the first weekend of October, with the southeast staying milder near 18–19C.