AIM
AIM 7-1-17
Estimating Intensity of Snow or Drizzle (Based on Visibility)
(a) Light. Visibility more than 1 / 2 statute mile.
(b) Moderate. Visibility from more than 1 / 4 statute mile to 1 / 2 statute mile.
(c) Heavy. Visibility 1 / 4 statute mile or less.
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