[Aloha]

I'd actually assume closer to 100km of coverage, 60 miles or so is a conservative estimate of coverage, in the prairies I would expect it to go much further - 500w of output on high band VHF goes quite quite far - I know how far the US NWS stations cover, and its much closer to 60+ miles.

[teuobk]

Environment Canada assumes 60 km on their Weatheradio page ( https://www.canada.ca/en/environment-climate-change/services... ), so that's what I went with. Having said that, I very much agree that the range is probably considerably greater in many cases.

[Marsymars]

While there are a handful of 500W stations, most are in the 100-200W range: https://www.qsl.net/ve7hce/weatherradio.htm