There are people who are already trying to pinpoint some areas where:
It won’t be uninhabitably hot
Food will grow
Relatively safe from flood encroachment
Not too susceptible to massive migration routes
I’m already looking for a car cover to enhance protection. The kids, not green thumbs by any stretch, are studying around growing food, soil composition; preparing to grow some of their food.
It will be increasingly hard to 'pinpoint' such areas, because heat is energy, so it powers its own migratory search for lower pressure areas to migrate into.
Think about the wet-bulb temperature mentioned in an earlier post. The bulb is evaporating because the heat blowing in and rising up from a hot area is causing evaporation.
The water being evaporated, however, is adding to humidity in the air and eventually it's going to build up somewhere and precipitate/rain/snow down.
As it builds up and tries to condense, however, it blankets heat because H2O is also a greenhouse gas. That means more heat keeps water from condensing/precipitating for longer. Eventually a storm will form, lighting will dissipate some of the built-up heat energy away, and precipitation will occur, often violently due to the huge quantity of water vapor that has built up in the sky.
The jet stream and other 'sky rivers' have been reported to be growing and weaving more due to higher levels of heat/energy, however, so these winding 'sky rivers' can snake around in a way that ground rivers can't because their paths are constrained by the solid contours of ground topography.
Sky topography is constantly changing and shifting as heat and pressure migrate around and alter the paths that wind, humidity, and clouds will take before/until they coalesce into a storm.