Real-Time Notifications
The Weather app has always been a rather passive iOS citizen, standing ready to assist you when you wanted to check the weather, but not really doing anything to tell you about it. This changes in iOS 15, which now takes one of the most important pages out of the Dark Sky playbook and adds real-time notifications for significant weather conditions. This not only includes severe weather events like impending storms, but it will also tell you if rain, snow, hail, or sleet is expected in the next hour — and even when it’s expected to stop.