Mt. Whitney – Mountaineers Route

The avalanche data adapter returned nothing for this location, and that's the one thing worth dwelling on. The Mountaineers Route above base camp crosses the East Face couloir and upper snowfields — sustained 35-45 degree terrain where a bad layer would matter. Late May in a year where Long Lake SNOTEL (840 ft) is still showing 61 inches depth and 26.4 SWE suggests significant snowpack remains at elevation despite seasonal warmth. Without a current forecast, you can't assume it's consolidated. Plan accordingly: start your summit push by 3-4 AM to catch frozen névé, and be off the steep snow before solar warming softens the surface, typically by 11 AM at 14,000 ft on a sunny May day.

The weather window is genuinely good, with the best day being Saturday. High of 43°F at forecast elevation with south winds at 5-22 mph and full sun. Surface winds of 22 mph from the south translate to roughly 35-40 mph at the ridgeline and summit — not dangerous, but enough to be cold. Dress for it on the upper mountain. Friday (today) has a slight snow shower chance at 22% precipitation probability, likely convective and afternoon — nothing that should affect a basecamp approach or early setup, but don't be on the summit after noon. Sunday degrades slightly with ESE winds again hitting 22 mph surface and another 14% snow shower chance in the afternoon.

The SNOTEL picture confirms snow persists well below normal snow line. Annie Springs at 6,021 ft shows zero depth, so the lower approach through Whitney Portal and up the North Fork drainage will be on bare trail or patchy snow. Expect the transition to continuous snow somewhere in the 10,000-11,000 ft range given the Long Lake depth reading and current temps. Stream crossings on approach are non-issues — all five gauges are at normal or low flows.

Logistics: Aim to camp at Upper Boy Scout Lake or Iceberg Lake Thursday night. Summit push Saturday pre-dawn, targeting the summit by 9-10 AM to stay ahead of afternoon convection and get off the technical terrain before solar softening. Crampons and ice axe are mandatory from the snow transition through the couloir — the overnight lows of 29°F will keep the upper mountain icy well into the morning. If you see any new cracking or whumpfing on the snowfields Friday afternoon, treat it seriously and reassess your line.