FWIW, the 30-minute guideline is the authoritative recommendation of the National Weather Service. The presumption is that there are no other capabilities available to determine when it is safe, which is probably the case for 90+% of our games. I know I don't have access to lightning detectors, NOAA radios, etc., in games I do, nor are any of my friends professional air traffic controllers.
Why wait the full 30 minutes if you do have access to vetted evidence that the storm is long gone? Heck, around here, another storm will be approaching before those 30 minutes pass. Use the tools that you have available. If you don't have them, then go with the 30-minute guidelines.
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"Let's face it. Umpiring is not an easy or happy way to make a living. In the abuse they suffer, and the pay they get for it, you see an imbalance that can only be explained by their need to stay close to a game they can't resist." -- Bob Uecker
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