Actually just the opposite,
In my case my Locals are the last channels to fade out during rain events heavy enough to knock out the signal.
I usually watch the locals OTA but sometimes I land on the D* signal not really paying attention. Just this past week it happened again. All of a sudden the signal broke up during a severeT-storm after it had been in the area for about 20 mins.
Checking during the storm, signal broke up several times but never lost it completely.
The new AT-9 has really helped this situation vs. the 3 lnb oval dish.