Subj : Wx Terms (D)(5)
To : All
From : Daryl Stout
Date : Sun Nov 05 2017 12:05 am
Duration of Sunshine
The amount of time sunlight was detected at a given point.
DURG
During
DURN
Duration
Dusk
Same as Civil Dusk; the time at which the sun is 6 degrees below the
horizon in the evening. At this time objects are distinguishable but
there is no longer enough light to perform any outdoor activities.
Dust Devil
A small, rapidly rotating wind that is made visible by the dust, dirt
or debris it picks up. Also called a whirlwind, it develops best on
clear, dry, hot afternoons.
Dust Plume
A non-rotating "cloud" of dust raised by straight-line winds. Often
seen in a microburst or behind a gust front.
Dust Storm
A severe weather condition characterized by strong winds and dust-filled
air over an extensive area.
Dust Whirl
A rotating column of air rendered visible by dust.
DVLP
Develop
DVV
Downward Vertical Velocity (sinking air)
DWNDFT
Downdraft - A small-scale column of air that rapidly sinks toward the
ground, usually accompanied by precipitation as in a shower or
thunderstorm. A downburst is the result of a strong downdraft.
DWNSLP
Downslope
DWPT
Dew Point - A measure of atmospheric moisture. It is the temperature to
which air must be cooled in order to reach saturation (assuming air
pressure and moisture content are constant).
Dynamic Ice
In hydrologic terms, pressure due to a moving ice cover or drifting ice.
Pressure occuring at movement of first contact termed Ice Impact
Pressure.
Dynamic Lifting
The forced uplifting of air from various atmospheric processes, such as
weather fronts, and cyclones.
Dynamic Wave Routing Model (DWOPER)
A computerized hydraulic routing program whose algorithms incorporate
the complete one-dimensional equations of unsteady flow.
Dynamics
Generally, any forces that produce motion or effect change. In
operational meteorology, dynamics usually refer specifically to those
forces that produce vertical motion in the atmosphere.
DZ
Drizzle
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