During the morning of 28 October, 20 Lancasters from each of the squadrons flew from their home bases to Kinloss, Lossiemouth and Milltown. A photo reconnaissance Mosquito flew over Tromsø that morning, and confirmed that "Tirpitz" was still moored off Håkøya and that weather conditions remained favourable for an attack. As forecasts for the next day indicated that good weather would continue, the attack was set for 29 October. Another Mosquito flew over the Tromsø area at midnight on 28 October, and reported that conditions remained clear.