Specimen Sheet · Vital Statistics
Classification · Terrain & Access
Field chart.
§ 02 · Flying Conditions · Field NotesUpdated 2026·03·21
This is an old military site with lots of toxic material being cleaned up, but will soon be opened up for recreational use including free flight. Now is our chance to simulate some flights on it, and figure out the ideal LZ's and XC routes for various wind conditions.
South facing launches are less steep but have an easier glide out to bailout areas. North west facing launch are steeper and the ridge is better, but it is a long way to an LZ
Has 1 different launch points. The best wind direction is 0 @ 0 knts but many sites can be flown from multiple directions, so check before you fly.
You can expect to find: thermal conditions ridge soaring conditions cross country potential , all dependent on current weather conditions.
§ 03 · Wind Window · Best Operating EnvelopeN · 000° ±0°
Chase the Wind
Nearest weather station to Mt. Umunhum. Select any row to see which launches are in wind, then set your MSFS world clock to that UTC time.
San Jose/Reid-Hillview Arpt, CA, US
13:43 UTC
21 km from site
Wind
Calm
0 kt
Ceiling
SCT 0 ft
10+ sm vis
Calm · 0 kt · 13:43 UTC
Select a time to check launches
Jan 21
Weather at , 21 km from Mt. Umunhum. Mountain conditions may differ — this is a clue, not a forecast. Adjust sim time on site until conditions feel right.
§ 07 · Location · Field CoordinatesWGS-84
§ 09 · Recent Flights · Log Book
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