FAA Part 107 Weather & Meteorology

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52 Terms

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Warm air on top of cold air. Fog, haze, low clouds, poor visibility, but smooth air.
Temperature inversion
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Turbulence (because the air is unstable), showery precipitation.
Moist, unstable air
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Smooth air, poor visibility, and steady (not showery) precipitation (because stable air is usually humid).
Stable air
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Intermittent precipitation.
Unstable air.
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Stable
Cool + Dry
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Unstable
Hot + Humid
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Just means "high altitude". Air is thinner, so lift is decreased.
High density altitude.
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Means a rain cloud
nimbus
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Wind is 180 degrees at 4 knots. The first three digits (180) are the
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compass heading (180). The last two #s are the wind speed (04).
18004KT
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Compass headings are always relative to true North in print, not magnetic North.
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If it's in print, it must be true.
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Sky is overcast at 700 feet. Remember, #s are always in hundreds.
OVC007
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Visibility is 1 1⁄2 statute miles (SM)
1 1/2SM
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BLPY
Blowing spray
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BR
Mist
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DS
Dust Storm
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DU
Widespread Dust
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DZ
Drizzle
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FC
Funnel Cloud
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+FC
Tornado/Water Spout
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FG
Fog
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FU
Smoke
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GR
Hail
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GS
Small Hail/Snow Pellets
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HZ
Haze
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IC
Ice Crystals
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PL
Ice Pellets
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PO
Dust/Sand Whirls
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RA
Rain
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SA
Sand
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SG
Snow Grains
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SN
Snow
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SQ
Squall
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SS
Sandstorm
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UP
Unknown Precipitation
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VA
Volcanic Ash
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+
heavy
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-
light
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is for the weather
AWOS
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Automated Weather
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Observing System
AWOS
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Low density altitude
have higher density of air
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(this is good)
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High density altitude
have lower density of air
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(this is bad)
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TS(thunderstorm) Life Cycle
1. Cumulus
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2. Mature
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3. Dissipating
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Nimbus
Big heavy clouds
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Stratus
High whispy clouds
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Humidity
Less visibility more efficient