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If a weather situation warrants two or more types of warnings to be in effect at the same time, a general term like “Winter storm warning” is encouraged to avoid the confusion of multiple warning types being carried at the same time. However, if no single warning type can describe a situation, a maximum of two types of warnings or watches may be combined in the same statement. In this case, the terms “Warning” or “Watch” shall be used in the singular identifying the situation as one warning. For example:

Rainfall and wind warning for:

Calgary.

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2.  If I understand the question correctly, a single warning would not cover separate and distinct events.   A warning could, as an example, have an effective period covering multiple severe thunderstorms, but would not cover, say, two separate high wind events if these resulted from separate meteorological events. 

I hope that answers the questions.

Regards,