.45 inch is a lot of rain. And I agree that local can be much different. Best practice is to always retract and I plan to follow that for sure. Too many people have stories telling what happens when they thought it was safe, only to wake up to a destroyed awning.
In addition to lowering one end of the main awning, our Zip-Dee has 3 metal gromets in the fabric near the tube to help drain water..... seems like a good idea to me....
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