variable visibility

variable visibility

[′ver·ē·ə·bəl ‚viz·ə′bil·əd·ē]
(meteorology)
After United States weather observing practice, a condition in which the prevailing visibility fluctuates rapidly while the observation is being made; the average of the observed values is used as the reported visibility, and it is reported only for visibilities of less than 3 miles (4.8 kilometers).
References in periodicals archive ?
I standard are these observations: visibility, variable visibility, precipitation and day/night (for those not sure if the sun is above or below the horizon).
TABLE 1 Nadle visibility by needle type and insertion angle Variable Visibility score [median (range)] Needle type Texture Towards 3 (2-3) (a) Texture Away 2 (1-3) (b) 22-gauge Plain 2 (1-3) 18-gauge Tuohy 1 (0-3) 22-gauge Stimuplex 1 (0-3) Angle of insertion Near Vertical 1 (0-3) (c) Medium 2 (0-3) Near Horizontal 2 (1-3) (excellent=3, good=2, poor=1, invisible=0).
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