Where does 🌫️ Fog emoji and 🌁 Foggy emoji come from?

Foggy emoji is slightly older than the fog emoji.
It was approved under Unicode 6.0 in 2010. Also popularly called fog, foggy city or fog bridge, this emoji depicts a city or bridge shrouded in fog, as shown in the screenshot from Emojipedia below.
Apple, Facebook, Twitter, Samsung, and sApp’s bridges resemble San Francisco’s iconic Golden Gate Bridge. San Francisco is known for its foggy weather—and it doesn’t hurt that many of these tech companies are headquartered in the city.
San Francisco was Incredible! 🌁
— Raven Carruthers (@ravencarruthers)
The fog emoji was approved by Unicode 7.0 in 2014. Its appearance is fairly uniform across platforms. It looks like, well, fog: a cluster of thick, grayish-white clouds.
Microsoft’s design, though, is more representational, featuring three, gray, wavy lines, as shown in the screenshot from Emojipedia below.
Examples of 🌫️ Fog emoji and 🌁 Foggy emoji
Who uses 🌫️ Fog emoji and 🌁 Foggy emoji?
True to their name, the fogand foggyemoji are used for foggy, cloudy, hazy, and even snowy weather.
It's a foggy morning in High Wycombe today! 🚨🌫️
Do take care on the roads and paths and enjoy the 😁
— Bucks New University (@BucksNewUni)
in the snow. 🌨️🎡🌁❄️
📸: jeremygonzo via Instagram
— Downtown Seattle (@downtownseattle)
They are also both used for metaphorical fogs, like when someone only has a foggy idea or feels like they are in a fog.
So delayed 🌫️ future unclear… To help my poor eyes I added the most probable way after Tuesday night
thanks for this überbrexitdiagram 💪
— Bernd 🇪🇺 Hüttemann (@huettemann)
If your gonna sub-tweet about anyone😒, make it as vague🌁 as you possibly can😑… but hey😯, if you want them to notice😕… be my guest👋😶
— 〽ΐ©}{λ€Ł Ꮹ. (@MikeQuality)
Thanks to the appearance of the Golden Gate Bridge on many platforms, foggy emoji is often used to represent San Francisco or the Bay Area, or for bridges, both physical and metaphorical.
You are all I have🌁♥️
— • (@x_ililr)
The fog emoji, meanwhile, is sometimes used to represent mist generally …
Walking into existence…☄️
A warm mist surrounds me.🌫️
A light rewarding persistence…🌞
A universal showing of rhapsody.🌠
Image:— Peace Vibes (@PeaceVibesPromo)
… and haze, as generated by smoking pot.
Cloud chasing 🌫️
— Zakkary (@ZakikiSuico)
Note
This is not meant to be a formal definition of 🌫️ Fog emoji and 🌁 Foggy emoji like most terms we define on Dictionary.com, but is rather an informal word summary that hopefully touches upon the key aspects of the meaning and usage of 🌫️ Fog emoji and 🌁 Foggy emoji that will help our users expand their word mastery.