An active volcano with lava in Iceland .

VAAC: acronyms and abbreviations

AIMMSAircraft Integrated Meteorological Measurement System
AODAerosol Optical Depth
ATDArrival Time Difference
CAACivil Aviation Authority
CAPSCloud and Aerosol Spectrometer
CSVComma Separated Value
DfTDepartment for Transport
FAAMFacility for Airborne Atmospheric Measurement
FIRFlight Information Region
FLFlight Level
IAVWOPSG  International Airways Volcano Watch Operations Group
ICAOInternational Civil Aviation Organization
IMOIcelandic Meteorological Office
IUGGInternational Union of Geodesy and Geophysics
LCBRLaser Cloud Base Recorder
LIDARLIght Detecting And Ranging
MetUMMet Office Unified Model
MOCCAMet Office Civil Contingencies Aircraft
MoUMemorandum of Understanding
NAMENumerical Atmospheric-dispersion Modelling Environment
NATNorth Atlantic
NATSNational Air Traffic Services
NCASNational Centre for Atmospheric Science
NERCNatural Environment Research Council
NMSNational Meteorological Services
RADARRAdio Detection And Ranging
UTCUniversal Time Constant
VAVolcanic Ash
VAAVolcanic Ash Advisory
VAACVolcanic Ash Advisory Centre
VAAGVolcanic Ash Advisory Group
VAGVolcanic Ash Graphic
VAORGVolcanic Ash Observations Review Group
VASAGVolcanic Ash Scientific Advisory Group
VOLCEXVolcanic Ash Exercise
VTValidity Time