Remember:
When we talk about actions in the future we can use these structures:
There's going to be a ....+ singular noun (heatwave, storm, blizzard)
There's going to be ... + uncountable noun (heavy rain, heavy snow, thunder and lightning)
There are going to be .. + plural noun (strong winds, dark clouds, freezing temperatures..)
It's going to...+ verb/ verb+adjective (snow, rain, be hot, be dark, be rainy, be windy,...)