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cso:safety:badweather [2015-02-17 20:50] sradford |
cso:safety:badweather [2015-04-24 00:18] (current) sradford |
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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. | ||
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| + | |||
| + | ==== 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. | ||
