Kirk, I feel for your buddy. I used to have to record ski conditions with the various media outlets from Yosemite Valley for Badger Pass, which was miles away and 3,000 feet higher than where I was. It was a moving target on a good day.
The weatherspark interface is slick IMO, once having zeroed in on a general region via the search mechanism, being able to drag the map to specific weather reporting stations which can vary widely in their data, especially in mountainous areas with elevation changes and micro-climates. in places like Yosemite, there are multiple weather stations reporting. If you don't know which site is providing the information, it can get ugly.
Plug in "Yosemite" on one of the "popular" weather websites and it gives a report from one of the high country stations, which isn't as helpful when you're looking for the valley conditions.
But combine the functionality of this new site with the other contributors like the webcams (which also report temperature) and you get a much more complete picture of conditions when you are sitting in the Bay Area planning your multiday trip.
GPS, Didn't mean to take up a tower position, just noting we all feel changes in air pressure to some degree, such as when riding in an airplane when our ears pop. Farmers, sailors, climbers, anyone who spends enough time outside gets attuned to the subtleties of weather and can sense weather moving in, in same way photographers can ballpark light values and time of day. Maybe not to a point where they will provide real-time actual barometric pressure readings...
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