The Great North Run will be hit by rain and strong gusts of wind today as stormy conditions roll in across much of the UK, heralding the beginning of autumn.
As some 55,000 people set off on the half-marathon in Newcastle, winds in the area are expected to be up to 40mph, and will increase to 45mph in the afternoon.
Western areas of Scotland are expected to see the worst rain of the day, with 30-40mm falling in some places. It will also bear the brunt of the windy conditions, with Northern Ireland and Cumbria, with some tree branches expected to be brought down by the gusts.
The rest of the UK is expected to see cool, cloudy and windy conditions, with no signs of a return of any sunshine.
World Champion and Olympic gold medallist Mo Farah has been announced as the honorary starter of the Bupa Great North Run weekend in Newcastle tomorrow.
Farah will fire the starting pistol for the shorter 5km event, organisers said.
Fresh from his gold medal successes in the 5,000m and 10,000m at the IAAF World Championships in Moscow, will then take on famous long-distance runners Haile Gebrselassie and Kenenisa Bekele in the longer run.