When it rains...MUNI stops working?

Remember about two weeks ago when it poured rain for a couple two days? I do. You know why I do? I remember those days because after I got dressed, I did the same thing I always do in the morning--check NextMUNI. However, unlike most mornings, I got this lovely surprise: Please note the time in the upper right hand corner. No, your eyes have not failed you. You are seeing correctly. Good 'ol, trusty NextMUNI predicted the nearest inbound N-Judah to be a mere 50 minutes away. Oh, only 50 minutes! I'll only be about an hour late to work, no problem! But, I mean that is provided I would even make it on that train. Let's be rational here. On normal mornings when there's more than 10 minutes between trains, a noticeably uncomfortable increase in per capita riders is likely. I don't even want to be threatened with having to ride that train 50 minutes away.

I understand San Franciscans aren't accustomed to what people in most other parts of the world would call "real" weather. So, I should expect that our public transportation system is unprepared for such weather. But just because it rains more than expected, shouldn't mean people can't get to work! Am I right?