Chasing Rainbows

Hawaii is known for its beautiful rainbows.  The license plates even have rainbows on them.  This is the only place that I remember having seen double rainbows.  We live near the center of Oahu and are closer to the mountains and slightly more elevated than other places we have stayed in Hawaii, so I think we have a bit more rain and clouds than nearer Waikiki. I have seen rainbows recently that were as bright as any I have ever seen.  They make you catch your breath.  As we were arriving home the other day, there was a beautiful rainbow on view from the parking lot.  I pulled out my phone, got the camera ready, jumped out of the car and "poof", the rainbow disappeared.  I thought it was a coincidence but a few days later, as we were driving and I was navigating (no I am not taking photos from the driver's seat!), I saw another beautiful rainbow and pulled out my phone, put it in camera mode and "poof" nothing to see.  I'm wondering where the sensor is that tells the rainbow it is time to disappear!!

If you look very, very carefully in the top right quadrant, there is a hint of that shy rainbow across the blue sky!