4. surface visibility ≥ 2500m and base of cloud ≥ 500ft
The surface visibilty is at least 2500m and the height above ground level of the Base of the lowest Cloud Layer for 3/8 Cloud (or SCT) or more is at least 500ft.
threshold Visibility 1600m Cloud 300ft
1
1
1
1
300
1
1
1
1
1600
threshold Visibility < 800m Or Cloud < 200ft
1
1
1
1
200
1
1
1
1
800
1. surface visibility < 800m or base of cloud < 200ft or sky obscured
The surface visibilty is less than 800m or the height above ground level of the Base of the lowest Cloud Layer for 3/8 Cloud (or SCT) or more is below 200ft or the sky is obscured.
threshold Visibility 3700m Cloud 700ft
1
1
1
1
700
1
1
1
1
3700
3. surface visibility ≥ 1600m and base of cloud ≥ 300ft
The surface visibilty is at least 1600m and the height above ground level of the Base of the lowest Cloud Layer for 3/8 Cloud (or SCT) or more is at least 300ft.
6. surface visibility ≥ 5000m and base of cloud ≥ 1500ft
The surface visibilty is at least 5000m and the height above ground level of the Base of the lowest Cloud Layer for 3/8 Cloud (or SCT) or more is at least 1500ft.
7. surface visibility ≥ 8000m and base of cloud ≥ 2500ft
The surface visibilty is at least 8000m and the height above ground level of the Base of the lowest Cloud Layer for 3/8 Cloud (or SCT) or more is at least 2500ft.
threshold Visibility 8000m Cloud 2500ft
1
1
1
1
2500
1
1
1
1
8000
threshold Visibility 5000m Cloud 1500ft
1
1
1
1
1500
1
1
1
1
5000
2. surface visibility ≥ 800m and base of cloud ≥ 200ft
The surface visibilty is at least 800m and the height above ground level of the Base of the lowest Cloud Layer for 3/8 Cloud (or SCT) or more is at least 200ft.
threshold Visibility 800m Cloud 200ft
1
1
1
1
200
1
1
1
1
800
5. surface visibility ≥ 3700m and base of cloud ≥ 700ft
The surface visibilty is at least 3700m and the height above ground level of the Base of the lowest Cloud Layer for 3/8 Cloud (or SCT) or more is at least 700ft.
threshold Visibility 2500m Cloud 500ft
1
1
1
1
500
1
1
1
1
2500