The number in the upper left of the map indicates the number of strokes in the last minute.

Red      dots indicate lightning that has occurred in the last 10 minutes.
Pink     dots indicate lightning that has occurred in the last 20 minutes.
Purple dots indicate lightning that has occurred in the last 30 minutes.
Blue     dots indicate lightning that has occurred in the last 40 minutes.
Green   dots indicate lightning that has occurred in the last 50 minutes.
Yellow  dots indicate lightning that has occurred in the last 60 minutes.

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