Build the hail campaign in February and leave it paused
The worst possible time to write a storm campaign is the week you need it running.
After a significant hail event, the auction crowds up fast. Writing ad copy, building a landing page, setting negatives and configuring call tracking while the office phone is ringing produces bad versions of all four.
Do it in the quiet months instead. A separate campaign, its own ad groups, its own landing page, a daily budget you have already agreed on, and an exclusion list you have already argued about. Then pause it.
Write the trigger rule down as well. Who turns it on, on what evidence, at what budget, and what has to be true about crew capacity before it goes live. A campaign that runs while you are three weeks behind on installs buys somebody else's roof.
Keep the same discipline on the way out. Storm campaigns should have an agreed condition for pausing, not a vague sense that things have calmed down.