Mountains
GFS
ECMWF
Ensemble median
Official local
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16-day snow matrix
Pooled ensemble probability of ≥ 1 in per day at the summit; the small number is the ensemble median. Click a cell to jump to that mountain.
Hourly range
Daily snowfall, 16 days summit · bars = deterministic models · band = ensemble 10–90% · line = pooled median
Probability of snow by day share of 82 members at or above each threshold
Ensemble plume cumulative snow per member, GEFS 31 + ECMWF ENS 51
Temperature and snowmaking hourly · click legend items to toggle lines
Hourly snow and liquid summit
Wind gusts and freezing level hourly, summit
Raw model grid point nearest 0.25° cell from the GRIB files · Kuchera ratio · no elevation adjustment · dashed = 10:1
Official local forecast
Daily table summit / base
Mount Washington Observatory higher-summits forecast
Keys: space play/pause · ← → step · Home/End. Move the mouse across the image to scrub when paused.
GFS
ECMWF
Frames matched by valid time. GFS runs to 384 h; ECMWF open data ends at 240 h. Hover either image to scrub.