When to use "generally", "usually", or "normally"

Generally speaking what are the usually accepted usage scenarios for the above mentioned words in a normally occurring English vernacular?

In short, what are the rules/guidelines for using generally, usually and normally?

Solution 1:

There are some subtle differences:

• Usually - X repeats over time, and some kind of variants happen more frequently than others. (time separation is implied)
• Generally - there are multiple instances of X, and there is more of some variant than others. (no time separation is implied)
• Normally - there are multiple instances of X, and there is more of the "standard" ones than the "weird" ones. (qualitative difference is implied).

Examples:

• I usually shop at the grocery store on the corner. (I do it repeatedly)
• Generally, the prices at the shop on the corner are lower than down the street. (most of the prices are lower, now)
• Normally, the shop is open 6AM-10PM, except during World Cup, when the owner closes at 6PM. (it's a special exception)

Solution 2:

They are generally similar, but as the basic meanings of those words show, generally seems to look at the broad picture and does not worry about minor details; normally focuses on the norm as opposed to exceptions; usually talks about frequency of events or describes a habit.