Getting 3 emails each time the first rain of the day is trig

Is there a reason I get 3 emails at once, each time the First rain of the day event is fired? The first subject simply states “WD WEATHER WARNING first rain today” but this is followed by 2 other emails that have a subject line reaching from the US to OZ stating all the current conditions. Why 3? By the way this is not something new and has been happening for about 6 or 7 months. I just got around to remembering to ask.