The water is finding its way inside because of the build up of ice & snow is still freezing on the roof edge.
If you’re finding leaks today, it’s most likely due to ice damming.
It doesn’t necessarily mean that you have damage in the roof or siding such as penetrations or tears.
It means that the snow is melting with the warmer weather & because of too much heat in the attic due to improper ventilation.
The water is finding its way inside because of the build up of ice & snow is still freezing on the roof edge, leaving the water nowhere else to go but in.
Below is a diagram to illustration the process:
Ice Damming Diagram