Is snowfall on Yahoo Weather cumulative?

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When it is written that way, it means for every forecast periods, you should expect to see 5-8 inches of snow. So the answer to your question is 5 to 8 inches for tomorrow during the day plus an additional 5 to 8 inches falling tomorrow night.

When they add storm total cumulative amount as part of the text forecast, they will add another line and it will be written in a way that makes it clear that you are looking at at the cumulative starting from the start of the event
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When ever you see just one accumulation listed per forecast period, it is almost always the storm totals accumulation expected for the forecast period.

Example:

Tonight...Cold with periods of snow. Low near 27 degrees. Northwest winds 15-25 mph. Snow accumulation of 5 to 8 inches expected. Storm total accumulations 12-18 inches....Show more