Condition 1 weather at the Scott Base in Antarctica means that no one is allowed outside.
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
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
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
