Anecdotal: In the city where I live, my family hasn't been able to buy flour for the past 4 weeks. It's always out of stock. I hear from clerks that they get it occasionally but it sells out in under an hour. My closest grocery store also allots the first hour after they open to seniors and others who are vulnerable and most of the time, the flour is gone during this hour.

Since we export so much grain every year, I'm amazed that there's such a massive shortage of flour. I don't know if it's the shortage of grains or mills.