Brief report:
Steven Sauter and I rode our mountain bikes from the locked gate (elev : 11,680') to the large saddle just before the slope to the summit (about a 5 1/2 mile ride). We cached our bikes just before the saddle area. We spent 40 minutes on the summit: resting, eating, taking pictures and talking to a service man who works for WMRS (he came up to the summit on one of the WMRS Toyota 4x4 trucks). The previous night we had thunderstorms that started at 10:00pm and lasted some hours into the night. So, on the way down from the summit, we heard thunder clouds again. That made us hike down faster and get to our bikes right away for a quick descent. Hail started coming down as we passed by the Barcroft Research lab. The fast ride down was very fun, despite getting hit with hail from Barcroft down to the locked gate. Driving out from the gate we passed through the heart of the thunderstorm: marble-sized white hail covered the surrounding mountain slopes making it appear as snow.
Additional info about climbing White Mountain Peak can be found here.