Venture to Exo-Lab 720 and collect Loftite Crystal Fragments to resore the Ancient Tower. With the tower stabilized, the weather around it should quickly change! The survivors should have an easier time once the weather around Settler's Reach starts warming.
Follow the power cables that lead north of the Ancient Tower
Collect Loftite Crystal Fragments outside Exo-Lab 729 by jumping into them or by destroying the Crystal Guardians.