Weather Acronyms: I's

'I'	See inphase
IA	Iowa
IAO	In and out of clouds
IC	Ice Crystals, Diamond dust (very small ice crystals in suspension), or In-Cloud Lightning
ICAO	International Civil Aviation Organization
ICE	Icing
ICG	Icing
ICGIC	Icing in clouds
ICGIP	Icing in precipitation
ID	Identifier, identify, or Idaho
IFFDP	International Flight Folder Documentation Program
IFLOWS	The Integrated Flood Observing and Warning System
IFR	Instrument Flight Rules
IL	Illinois
IMC	Instrument meteorological conditions
IMDT	Immediate
IMDTLY	Immediately
IMPL	Impulse
IMPLS	Impulses
IMPR	Improve or improving
IMPT	Important
IMT	Immediate or immediately
INBD	Inbound
INC	In cloud
INCL	Include
INCLD	Included
INCLG	Including
INCLS	Includes
INCR	Increase
INCRD	Increased
INCRG	Increasing
INCRGLY	Increasingly
INCRS	Increases
INDC	Indicate
INDCD	Indicated
INDCG	Indicating
INDCS	Indicates
INDEF	Indefinite
INFO	Information
INLD	Inland
INOP	Inoperative
INP	If not possible
INPR	In progress
INS	Inertial Navigation System
INSTBY	Instability
INSTF	Intensify or intensifying
INSTL	Install or installed or installation
INTCNTL	Intercontinental
INTL	International
INTMD	Intermediate
INTMT	Intermittent
INTMTLY	Intermittently
INTR	Interior
INTRMTRGN	Intermountain region
INTRP	Interrupt or interruption or interrupted
INTS	Intense
INTSFCN	Intensification
INTSFY	Intensify
INTSFYD	Intensified
INTSFYG	Intensifying
INTSFYS	Intensifies
INTST	Intensity
INTSTY	Intensity
INTVL	Interval
INU	Inertial Navigation Unit
INVOF	In vicinity of
INVRN	Inversion
IOVC	In overcast
IP	Ice pellets
IPV	Improve
IPVG	Improving
IR	Infrared or Ice on runway
ISA	International standard atmosphere
ISOL	Isolated or Isolate
ISOLD	Isolated
ITCZ	Intertropical Convergence Zone