What is a weak interruption and more importantly, how do I recognize it?
According to the page below, these are weak interruptions
If the break is weak, do not use comma(s).
Anna called to say her car would not start. Rafael will therefore have to walk to school.
Weak interruption = no commas.
The long noodles splashed tomato sauce all over the front of Brenda's shirt. Ordering fettuccine was a mistake indeed.
Weak interruption = no comma.
How is the interruption below from the same page different from the above?
After mowing the yard in the hot sun, Pedro was too hungry to shower. He did wash his dusty hands, however.
I do not think you make weak or strong interruption simply by removing or adding a comma.
Note: I read on another website that a weak interruption is a non-restrictive clause, or non-essential information. The examples above, however, do not show any clauses of that sort.