A tree stays upright because its roots grip the soil. After days of heavy rain, saturated ground turns soft and loses that grip, so the roots can shift or slip, especially on one side. A tree that looked steady in dry weather can start to tilt, and a sudden change in lean suggests the root system is compromised.
Too much rain and drought can both weaken roots over time. Waterlogged soil can lead to root rot, while long dry spells can cause desiccation. Either way, the tree anchors less securely than it once did, and even a gusty afternoon can expose a significant weakness.
This is why Trees Down Under treats a leaning tree after a storm as something to check early, not something to wait on. Whether the answer is support, pruning or tree removal, a certified arborist can tell you which. For same-day quoting across Sydney and the Hills District, call 0475 463 597 any time. Council permit guidance is part of the service, so you are not left to work out the paperwork alone.