WEATHER CONDITIONS

Check carefully the amount of ice/snow on the lightning rail that runs around the dome and on the transfer conductors that are springloaded into that rail. Do not open in questionable conditions! Example, when two or more inches of ice are surrounding the inner track, it may not be possible to rotate it (consider however it might melt it off).
Make sure DOME STRIP HEATER is on.
In ice/snow conditions, make sure you parked the car as protected as possible from falling ice/snow and away from the wind, brake off.
To check for windblown dust, tape a piece of paper out in the dome and periodically run your hand accross it to check for cinder dust; you can also check visually a bowl of water.
To check for humidity, do not rely only on the humidity readings, it is not safe to open until you see the water is drying up on the catwalk railing. The water condense easily and, if low temperature, froze on the instrument window.
IF the weather is threatening, try to fill the instruments dewar on time, before you have to leave the summit.
Close the 24inch.

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