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cso:safety:badweather [2015-02-17 20:50]
cso:safety:badweather [2015-04-24 00:18] (current)
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 +====== Adverse Weather ======
 +==== Observing ====
 +Stay aware of the weather conditions while observing.
 +Look outside occasionally. There are many [[cso:​weather:​weather|weather resources]] available, including the [[http://​www.eao.hawaii.edu/​weather|EAO weather summary]].
 +In case of adverse weather, close the shutter immediately. Remember it takes quite a long time (15 min) to close the shutter completely.  ​
 +When observers are present at the telescope, any of the following conditions preclude observing. Close the shutter if any occur:
 +  * //Relative humidity// outside the dome above 80%. 
 +  * //Wind speed// at the JCMT sustained above 35 mph (16 m/s). 
 +  * //Rain//, //snow//, //sleet//, //ice//, //fog//, or other precipitation. ​
 +[[cso:​policy:​remote_obs|Remote observations]] require ​ better conditions. Do not observe if any of these occur:
 +  * //Relative humidity// outside the dome above 60%.
 +  * //Wind speed// at the JCMT sustained above 30 mph (13 m/s). 
 +  * //Rain//, //snow//, //sleet//, //ice//, //fog//, or other precipitation. ​
 +=== Caveats ===
 +  * The CSO hygrometer and thermometer are mounted inside the dome. So if the shutter is closed, the temperature is usually higher and the relative humidity lower than outside. ​
 +  * The CSO does not have a working anemometer. As a proxy, watch the JCMT wind speed. If the JCMT anemometer is off line, watch the SMA wind speed. ​
 +==== Evacuation ====
 +  * //Do not become stranded// by adverse weather. Anticipate the need for a quick evacuation if weather conditions deteriorate.
 +  * //Ice//
 +    * Icy conditions can occur anytime of the year. 
 +    * Icy conditions can occur quickly and without warning.
 +    * If the temperature below freezing (0 °C) and the humidity is high, ice can accumulate easily everywhere including on vehicles and on the road.
 +    * Beware of falling ice! If ice has formed on buildings do not park near them and use caution when entering the dome. Shutter movement may cause ice to fall!
 +  * //​Wind// ​
 +    * If wind speeds exceed 60 mph (27 m/s), evacuate.
 +    * Park vehicles pointed into the prevailing wind. Take care opening vehicle doors.
 +  * //​Snow//  ​
 +    * If it starts snowing, evacuate. ​
 +    * If snow is expected, stow the dome 90 degrees to the prevailing wind direction before leaving.
 +  * Always put vehicles in the lowest gear possible when descending. This is especially important if conditions are icy.
 +  * Be prepared to mount chains on your vehicle.
 +  * Comply with MKSS recommendations regarding observatory access and chain usage. ​
 +    * Watch the HP white board near the main entrance for current road conditions. ​
 +    * If MKSS issues an absolute evacuation order or closes the road, all facilities must comply.
 +  * Emergency phone numbers are posted near the control room phone and on the [[cso:​logistics:​contacts]] page as well as in the notebooks in the vehicle glove boxes. Cell phone reception is sporadic above HP.
cso/safety/badweather.txt · Last modified: 2015-04-24 00:18 by sradford
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