Antarctica Weather Danger Classification

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Short description: Classification system for Antarctica weather

The weather in Antarctica can be highly variable, and weather conditions will oftentimes change dramatically in a short period of time. Weather conditions on the continent are classified in a number of ways, and restrictions placed upon workers and other staffs vary both by stations and by nations

## McMurdo Station (USA)

Condition | Criteria | Example

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Condition 3 /
Normal Condition 3 | Must meet all of the following criteria:

* Visibility is either greater than 1⁄4 mile (400 m), or it falls to ​1⁄4 mile or less for less than one minute at a time
* Windspeed is either below 48 knots (89 km/h; 55 mph), or it reaches 48 knots or above for less than one minute at a time
* Air temperature and wind chill are either above −75 °F (−59 °C), or falls to −75 °F or below for less than one minute at a time

Condition 2 /
Severe Condition 2 | Must meet all of the following criteria:

* Visibility is either greater than or equal to 100 feet (30 m), or it falls below 100 feet for less than one minute at a time
* Windspeed is either less than or equal to 55 knots (102 km/h; 63 mph), or it exceeds 55 knots for less than one minute at a time
* Air temperature and wind chill are either −100 °F (−73 °C) or above, or falls below −100 °F for less than one minute at a time

And also must meet one or more of the following criteria:

* Visibility is less than or equal to 1⁄4 mile (400 m), sustained for one minute or longer
* Windspeed greater than 48 knots (89 km/h; 55 mph), sustained for one minute or longer
* Air temperature and/or wind chill of −75 °F (−59 °C) or below, sustained for one minute or longer

Condition 1 /
Severe Condition 1 | Must meet one or more of the following criteria:

* Visibility less than 100 feet (30 m), sustained for one minute or longer
* Windspeed over 55 knots (102 km/h; 63 mph), sustained for one minute or longer
* Air temperature and/or wind chill below −100 °F (−73 °C), sustained for one minute or longer

Sources: United States Antarctic Program - The Antarctic Sun, National Science Foundation - McMurdo Station Guide 2006 & Field Manual for the U.S. Antarctica Program

## Scott Base (New Zealand)

Condition  | Criteria

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Weather Condition 3 | Must meet all of the following criteria:

* Severe weather is possible within 24 to 48 hours
* Visibility is greater than 300 metres (980 ft)
* Wind less than or equal to 45 knots (83 km/h; 52 mph)
* Air temperature and wind chill are above −60 °C (−76 °F)

Weather Condition 2 | Must meet all of the following criteria:

* Visibility is greater than 30 metres (98 ft)
* Windspeed is no greater than 55 knots (102 km/h; 63 mph)
* Air temperature and wind chill are no colder than −73 °C (−99 °F)

And also must meet one or more of the following criteria:

* Visibility less than 300 metres (980 ft)
* Windspeed is greater than or equal to 48 knots (89 km/h; 55 mph)
* Air temperature and/or wind chill of −60 °C (−76 °F) or below

Weather Condition 1 | Must meet one or more of the following criteria:

* Visibility less than 30 metres (98 ft)
* Windspeed over 55 knots (102 km/h; 63 mph)
* Air temperature and/or wind chill are below −73 °C (−99 °F)

Sources: Antarctica New Zealand - Field Manual 2012-2013

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