High winds are set to rampage southeast Australia while Tasmania faces unexpected flood warnings.

Sydneysiders will enjoy a 25 degree day, but the threat of damaging winds will make it feel like 10 degrees by 5pm.

The peak of high tide on Monday afternoon could lead to coastal inundation and some of the highest water levels on record.

The worst for NSW and the ACT is yet to come overnight with an unprecedented cold front.

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