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MI
Shallow
BC
Patches
PR
Partial
DR
Low Drifting
BL
Blowing
SH
Showers
TS
Thunderstorms
FZ
Freezing
Light
-
Moderate
none
Heavy
+
VC
Vicinity
DZ
Drizzle
RA
Rain
SN
Snow
SG
Snow Grains
IC
Ice Cystals
PL
Ice Pellets
GR
Hail
GS
Small Hail
UP
Unknown Precip
BR
Mist
FG
Fog
FU
Smoke
VA
Volcanic Ash
DU
Widespread dust
SA
Sand
HZ
Haze
PY
Spray
SQ
Squalls
FC
Funnel cloud, tornado, waterspout
SS
Sandstorm
DS
Dust Storm
Sierra AIRMET
IFR Conditions, Mountain Obscuration
Tango AIRMET
Moderate Turbulence, surface winds 30 KTS +, low level wind shear below 2,000 feet
Zulu AIRMET
Moderate Icing, Freezing level heights
WS SIGMET
Severe Icing, severe turbulence, dust storms and sandstorms, volcanic ash, tropical cyclones
WSC SIGMET
Severe thunderstorms, hail greater than ¾ inch, 50 + KTS of wind, thunderstorms in a line, tornadoes
High Pressure Systems
Sinking air which suppresses the clouds, stable conditions, clear skies, less widespread precipitation
Low Pressure systems
Rising Air, Instability, cloud development, high chance of precip, stronger winds
Cold fronts
showers, thunderstorms, turbulence, temp changes and visibility changes
Warm front
layered clouds, precipitation, reduced vis, low ceilings, icing
Stationary Fronts
Long time w/ clouds, persistant precip, bad visibility, changing ceilings, unfavorable for long periods of time
Occluded front (cold front catches up to warm front)
Estensive clouds, precipitation, reduced vis, turbulence, unfavorable conditions
Widespread isobars
lighter winds, pressure changes gradually over distance
Closely spaced isobars
stronger winds and frequent pressure changes over distance
AO1
Weather station without a precipitation discriminator (doesn’t tell rain from snow)
AO2
Has a precip discriminator, can tell different types of precip
Icing
LGT (light), MOD (moderate) , SVR (severe), CLR (trace clear)
RIME Icing
Milky, opaque small droplets freezing instantly
CLR Icing
hard, glossy heavy ice. Spreads out before freezing (most dangerous type)
MXD
Mix of RIME and CLR Ice
OV
Vor PIREP
FL
Flight Level
TP
Type
SK
Sky cover
TA
Temperature
IC
Icing
RM
Remarks
Radiation Fog
Formed on clear, calm nights when the ground loses heat rapidly via terrestrial radiation, cooling the air immediately above it to its dew point
Advection Fog
Formed when warm, moist air moves horizontally over a colder surface (land or water), cooling the lower layer of air below its dew pointUpslope Fog
Upslope Fog
Formed when moist air is pushed up elevated terrain or a hillside; as it rises, it expands and cools adiabatically until it saturates
Steam (Evaporation) Fog
Formed when cold air moves over much warmer water; moisture evaporates into the cold air and immediately condenses, looking like "steam" rising off a lake or river.
Bravo Airspace Day and Night
3 SM COC
Charlie Airspace Day and Night
3152 (3 SM, 1000 above 500 below 2,000 horizontally)
Delta Airspace Day and Night
3152 (3 SM 1000 above, 500 below 2000 horizontally)
Echo Airspace Day and Night Below 10,000 feet MSL
3152 (3 SM 1000 above, 500 below, 2,000 horizontally)
Echo Airspace Day and Night Above 10,000 MSL
5111 (5 SM 1000 above, 1000 below, 1SM horizontally)
Golf at or below 1200 AGL Day
1sm COC
Golf at or below 1200 AGL Night
3152 (3 SM, 1000 above, 500 below, 2,000 horizontally)
Golf above 1200 AGL below 10,000 MSL day
1152 (1 SM 1000 above 500 below 2000 horizontally)
Golf above 1200 AGL below 10,000 MSL Night
3152 (3 SM 1000 above, 500 below, 2,000 horizontally)
Golf above 10,000 day and night
5111 (5 SM, 1000 above, 1000 below, 1 SM horizontally)
General speed limit below 10,000 MSL
250 KTS
Near Class C/D within specified altitude and distance
200
Under Class B or in a VFR corridor through it
200
Class A, B, C Transponder requirements
Mode C Transponder with ADSB out
Mode C Veil
Within 30 NM of a listed Class B primary airport, from the surface to 10,000 feet MSL, you generally need both Mode C and ADS-B Out