These pictures show the wall of smoke and flames facing firefighters on Winter Hill.
60 firefighters from Lancashire Fire and Rescue Service and Manchester Fire Service have combined to try to beat back the fire. 12 fire engines are at the scene.
There’s a 500-yard stretch of fire which goes from the Winter Hill mast to the Rivington Pike.
Aerial footage, from the fire service’s drone, shows the extent of the fire and smoke can be seen from Preston and Manchester.
Read more: Hot weather warning issued for Preston and Lancashire
The fire service has called in the police helicopter for support, and nearby homeowners have been advised to keep windows and doors shut while the flames are tackled.
Rivington saw another moorland fire, on a different stretch, during Monday (27 June).
Update: Fire service say they want to contain fire by ‘nightfall’
Winter Hill fire – this video shows the fire on moorland between Winter Hill transmitting station and #Rivington Pike near #Chorley.
The “line” of flames is said to stretch 500 yards along the brow of the hill & smoke can be seen for miles around. @BBCNWT pic.twitter.com/HRCQQOAl3R
— BBC Lancashire (@BBCLancashire) June 28, 2018
The fire began around 4.30pm on Thursday (28 June) as Preston and Lancashire continue to see temperatures of more than 30 degrees.