Metro-02
Meteorology and Flight Planning
(2) Blue - severe thunderstorms (maximum wind
gusts of 50 kts or greater and/or hail,
if any, 3/4-inch or greater in diameter) and
locally damaging windstorms
(3) Green - moderate thunderstorms (maximum
wind gusts of 35 kts or greater, but less
than 50 kts; and/or hail, if any, 1/2-inch or
greater in diameter, but less than 3/4-inch in
diameter)
(4) Orange - thunderstorms (maximum wind
gusts less than 35 kts and/or hail, if any, less
than 1/2-inch in diameter)
(5) Black - strong surface winds (35 kts or more
and not associated with thunderstorms)
(6) Purple - heavy rain (2 inches or more in
12 hrs or less)
(7) Hatched purple - heavy snow (2 or more
inches in 12 hrs or less)
(8) Brown - freezing precipitation
e.
Other abbreviations
(1) MIC (maximum instantaneous coverage) - the
percent of the area which will be covered by
thunderstorm cells at time of maximum
activity
(2) TAA (total area affected) - the percent of the
area which will experience one or more
thunderstorms during the applicable valid
period
(3) EP (entire period) - used if the phenomena
are expected for the entire period instead of a
particular time period
(7-97) Original
Page 2-64
Previous Page
