AIM
ARP
Airport Reference Point
The approximate geographical center of all the usable runway centers.
PL
Ice Pellets
VOR
Very High Frequency Omni Directional Range
ARTCC
Air Route Traffic Control Centers
AWOS
Automated Weather Observing System
TALPA
Takeoff and Landing Performance Assessment
To address the runway contamination for takeoff and landing
SLD
Supercooled Large Droplets
MEA
Minimum Enroute Altitude
Lowest published altitude between radio fixes which assures acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes.
ATCT
Air Traffic Control Towers
BLSN
Blowing Snow
RVR
Runway Visual Range
Is the measure of distance a pilot can see down the runway in low visibility conditions.
CB
Cumulonimbus
ALSF-II
Approach Lighting System with Sequence Flashing Lights Category II Configuration
GDP
Ground Delay Program
LTGCG
Lightning Cloud to ground
RVSM
Reduced Vertical Separation Minima
A reduction in vertical separation from 2,000' to 1,000' between FL290 - FL410.
ISA
International Standard Atmosphere
MALSR
Medium Intensity Approach Lighting System with Runway Alignment Indicator Lights
FCA
Flow Constrained Area
IMC
Instrument Meteorological Conditions
LAHSO
Land and Hold Short Operations
ATC procedures where pilots land and stop before a designated hold short point to increase airport efficiency.
VCSH
Showers in the vicinity
MSA
Altitudes depicted on approach charts which provide at least 1,000' of obstacle clearance within 25nm radius of the navigation facility, waypoint or airport reference point upon which the MSA is predicated. This is for emergency use only.
ATIS
Automatic Terminal Information Service
TAF
Terminal Aerodrome Forecast