seems every long distance ride I'm on, especially with momma as a passenger, has us drinking from the fire hose for hours non-stop.
Many times we have spent 8 hours, in torrential downpours, covering 500 miles or more.
If you know it is a storm that you will not see ending, keep going, and use 4 way flashers... riding on thru the storm beats sitting idle, and having the storm over you for hours.
NEVER pull off under a bridge, on a highway to wait out a storm, instead exit the freeway and get off in a parking lot, or other safe place.
People have a habit of pulling off under bridges, and quickly approach without looking, I have seen a few crashes where car drivers simply ran over a group of bikes under a bridge by not paying attention when they were trying to occupy that sacred area.
keep pushing on, just use caution, you will likely ride out of the storm at some point. Hopefully not into another one of more intensity....been there.....many times...