P.S. 1 days later: Just so nobody has to infer anything, I have enabled this only on my lawn so far and use Flex Daily schedules. I got last night “Cool Wave Detected” and more details is:
Cool adjustment: 4/27 - 4/29
Schedule: Grass
Apply or ignore adjustment?
From here, it of course allows me to apply or ignore. It also gives me the option to “Automatically apply in the future”. Looking at the forecasted weather, I am seeing those three days as cooler with rain already (the fourth day is still cool without rain). Some watering is currently scheduled for the 1st & 4th day.
I tried “Ignore” and it of course went from “Pending” to “Ignored”. I looked at the calendar and it now seems to be watering fewer days (Fri, Tue. 1 zone on Thu, rest of zones on Sat). Maybe that triggered a recalculation. I found I could change it from “Ignore” to “Apply” which changed it to “Applied”. I am now seeing what appears to be the same schedule, but the Tue time is reduced 20%. I think I will put it as Ignored this time.
I would imagine this is the same if I had a heat wave.