Thanks for your comments Mike. The Triumph is the lightest wind/rain 'jacket' I could find online. I replaced the original metal zipper clasps with lightweight rope to save a little weight.
Summer storms in the Sierras are usually brief afternoon events much like the Rockies. I got a light shower in the early evening at 9,250 ft one night.
I used the long sleeve synthetic t-shirt as a wind shirt in the evenings and at the top of Mt. Nelson this summer. When I got to the summit an afternoon storm was heading south. As it got windy and cold I added layers as needed (long t-shirt, gloves, warm hat) but I didn't need the TNF Anorak that day. Although I always pack it I haven't needed it all summer.
I'm heading out the second weekend of October into the Sierras for a three day trip and may get a chance to try out the Triumph as it will probably be getting colder and windier by then. Until then, enjoying the summer.