Flip the script. Have a bunch of adventurers hired by a guild to take out a dungeon full of “monsters” goblins, ogres, etc. See how long it takes before they realize its a mall/bazaar or that the guild wanted it gone because the mall/bazaar owners refused to capitulate to the guild.
For Canadians, Environment Canada has a fantastic app called WeatherCan that includes all of the usuals, has doppler radar for all of North America with the option for a one or three hour loop.
It also includes alerts from Environment Canada for any location you’ve added and links to the marine weather forecast site.