The Backdoor Cold Front

It was a sunny day in early May in 2021. THG, a high school senior, was about to graduate the next month. The weather was very warm, with temperatures in the mid 80s, so THG decided to go for a bike ride to work out his legs. At this point, he had been working out since early 2019, and could easily leg press 450 pounds, which is very impressive for a high school student. 
Suddenly, a few miles ahead, THG could see what appears to be a heavy deck of clouds, and the wind suddenly picked up. THG thought to himself, "Great. Yet another backdoor cold front? I thought we were done with this total bull already". A few minutes later, he started to notice a significant drop in temperatures. Another few minutes pass of THG riding his bike, and the clouds have moved in blocking out the sun. At this point, the temperature had fallen sharply to around 69 degrees Fahrenheit.
WIP