As a fellow Wednesday [5/24] goer (also decided awhile ago), I'm hoping that it doesn't rain either. But if it does, I'd rather it rain in the AM. Just a plain rain--unless extremely heavy--will typically not close things down. Wind and lightning will--visual confirmation of lightning shuts just about every roller coaster down IMMEDIATELY, but they'll let those that are in line stay there if they so choose. In the past, new people are not allowed to get in line if a ride is closed--for whatever reason.
John
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"Thank you for riding [fill in name of ride], and enjoy the rest of your day here at [fill in name of park]."