Square Units

The biggest I've seen in a published source in the wild is an 80-fold error in a reported distance, which I think came from a series of at least three unit conversions and area/length misinterpretations.

Muskoka

Now:Sunny
Temp:14.9°C
Today:A few clouds. Increasing cloudiness late this evening then a few showers. Wind southeast 20 km/h becoming light early this evening. Low plus 3.

Toronto

Now:Mainly Sunny
Temp:21.1°C
Today:Clear. Increasing cloudiness near midnight then 60 percent chance of showers overnight. Wind becoming southwest 20 km/h before morning. Low 10.