Screenshots right now for Grand Junction. One shows snow and the other doesn't.

I don't think this is an app vs web issue. One screenshot is on 1 hour intervals and the other is on 3 hour intervals.

I have also noticed this issue with snow. Last night the 1-hour interval forecast said no snow; the 3-hour interval forecast said 0.4 cm; it snowed about that much. The little forecast icons for each hour also did not indicate snow on the 1-hour.

There seems to be a problem with the 1-hour interval forecast. To reproduce, compare precipitation amounts in the next day between the two forecasts. I think it is more noticable when there is a small amount of precipitation, often removing the precipitation entirely in the 1-hour.

It sounds like it happens with waves too.