2001 Gear change problem

Hello, I have a 2001 Intrigue with about 70K miles on it. Once in a while, I notice that all of a sudden the gears start skipping and in doing so, it sort of jerks. This has happened to me before, and I have noticed that it'll stop doing it, if the cars' at rest for a long period of time. Last night, I was at a signal, and I accelerated a little more and after that, I started feeling the jerks whenever the gears would change(it was as if it was having trouble changing gears). This morning, however, I started the car up and it drove just fine. I'm not sure as to whats going on. I have also noticed that it seems to happen more when its rainy or wet. Can anyone please give me some suggestions or advice as to whats going on?
Thank you

It sounds like the pressure control solenoid in the transmission is going bad. It is a common failure and i don't think it costs too much to fix. I have the same problem with my car, except it happens about once a month. I will turn it on, usually after it has been "resting" for less than an hour, and when I accelerate, especailly when I go easily, it will jerk into the next gear. when I pull it over and restart, its fine. I'll have to get my car in to change the solenoid.

Thank you for your response. I guess I'll take it in to the mechanic to get it fixed. Thanks again. You have been a great help!! :-)