Heavy rain can be dealt with but the problem with squalls is wind. I saw a large branch smash an SUV as I rolled by in a parking lot, and had a near miss from a falling tree during one. On another occasion I was directly under the tornado siren when it went off - which is startling but watching the wind and hail when I got under an overpass was even more disconcerting.

I've come across a hundred yards of forest laid out across the path, two trees deep. I was glad that time that I'd watched the radar before setting out. Just exercise caution in looking at the radar first online, wait for the storm to pass through your path and then it should be fine.