100% melted. Kept on the list on request.
St. Mary's Glacier
39.8371, −105.6492 · 3,407 m · E · 12° · 0 ha on Sep 22
Gone
From the satellite, Sep 22 pass. No ground report in the last 10 days.
See what we saw
Drag the handle to compare two passes. The blue line is what the scanner counted as snow.
A · JUL 4 · CLEAR · 1.4 HAB · SEP 22 · CLEAR · 0 PX
0 200 m
N
Every pass this season · pick A and B
Sentinel-2 L2A true color, read at 20 m. One pixel is 0.04 ha. A strip narrower than about 40 m can hold skiable snow and show nothing. By mid-September, north-facing cirques sit in shadow at the late-morning overpass, so one zero isn't proof of anything.
How we got to this status
- The Sep 24 pass was cloudy over the site (100%), so a cloudy pass counts as no look, not as zero. This uses the Sep 22 pass.
- Sep 22 pass fully covers the site and is clear over it.
- No snow pixels in the window (under 3 px counts as zero).
- Not flagged as possible new snow.
- A second clear zero in a row (after Sep 2), so it reads Gone.
Scan run 1 · status rules 2026.09-2
NDSI > 0.4 · NIR ≥ 0.6 × green · SCL mask · algorithm 2026.09-2
NDSI > 0.4 · NIR ≥ 0.6 × green · SCL mask · algorithm 2026.09-2
Getting there
- Approach
- ~1 h · 2 km one way
- Route
- St. Mary's Glacier TH, short trail from the road
- Estimate
- Munter rule from straight-line distance and climb. Rough.