60% chance for Scattered Thunderstorms means there is a very likely chance that you will see thunderstorms scattered around throughout the day. A scattered thunderstorm means that one moment their maybe rain and thunder, the next moment it may be clear.
Use this table for reference:
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There is no 100% CHANCE of anything - If it is 100% it is 100% - raining or snowing
It means that it will probably rain.
You don't know. Theres a 50/50 chance that it will and then a 50/50 chance that it won't.
it will snow today or for however long
It depends on what exactly the conditions are. If you mean from a 52 card deck, drawing one card right after the other, then the chance that they will be those two cards in that exact order is 1/52 * 1/51. This is pretty much a percent of a percent. .00038, or about 4 percent of a percent.