While the "vehicle stopped on shoulder" is by far the most egregious offender, the "weather" alert can also be annoying.
On a typical commute of ~20 miles in the Boston area, I'll get 8-10 "vehicle stopped on shoulder" warnings. They generally are out of date and the signal to noise ratio is very unfavorable. I've disabled their display on the map, but they still pop up. They interrupt whatever I'm listening to and are making me contemplate deleting this app entirely because they are so numerous, annoying and generally useless.
The "weather" alert is another nearly useless feature that can also border on unsafe. By definition I'm out in the weather when I'm driving, so I'm not exactly surprised by snow, fog or rain. I can see those weather conditions by looking out the windshield, and if I can't see them, I likely shouldn't be driving at all. At one point during a winter storm I just turned off the app entirely because of all the "help" I was getting that told me it was snowing ... yes, it is. Now stop interrupting me so I don't slide off the road, thanks.
There are many great and helpful alerts out there -- object on road, cops, construction, accident ahead, etc. These are generally very useful and not over-used.