After a nontrivial approach over snow, talus, and scree fields with heavy packs, arrived in Palisades Basin just in time to see massive rockslide down to the bench below summit. Started ascent next morning, got snowed on briefly at 13,000 feet. Pressed on to summit by noon, rapelled off summit block, and lower chute below catwalk. Careful descent in soft rotten snow on steep slopes, got hit by snow again at 13,000 ft, this time with lightning cracking directly over our heads and some hail. The situation rapidly became dangerous and scary; all rocks were subsequently coated with a semi-frozen slurry and were incredibly slippery. Waited out storm. Descended to basin, and slogged along the snowfield back to camp below Thunderbolt Pass. Saw beautiful alpenglow near dusk. Heard another loud rockfall after sunset. Having consumed food and fuel, had less of a nontrivial exit the next morning. However, freeze-thaw cycles and the cold early hours made slick, very hard, ice with a lower rock filled runout causing a risky exposed descent from the pass well above Dusy Basin.