Originally Posted by
FlowerBlossom
Even better, you can click on anywhere on the map and it will change location of forecast region and provide the forecast for that region.
As you do this, you can check for which forecasting station they are generating the weather from. The one I've found closest to the top of Mt. St. Helens is called "Spencer Meadow"; I think it's roughly at the same elevation as the viewing station at the top of the summit.
Likewise, I've been clicking around for weather forecasts for my ride in the North Cascades....best I've found is a station called "Washington Pass." Due to be 39 degrees and 30% chance of rain when I hit Washington Pass tomorrow.
The reason why I saw the TdB is easier to do unsupported is because you have access to water at the visitor centers all the way up....I don't think you ever have to ride more than 15 miles or so to the next facility where you can get water.
Food is a little scarcer at the top, though I think in the summer there is a food truck/concessionaire who sells food in the parking lot at the top.