Occasional Weather

EXPLANATION OF ABBREVIATIONS AND ACRONYMS

.OCCASIONAL SNOW SHOWERS WILL CONTINUE INTO THIS EVENING.Occasional snow showers will continue into this evening before becoming scattered overnight. Rapidly changing visibilities will be possible through early evening in the heavier snow showers. Some light accumulations of less than an inch can be expected. Get the forecast for today, tonight & tomorrow's weather for Portland, OR. Hi/Low, RealFeel®, precip, radar, & everything you need to be ready for the day, commute, and weekend!

Contained in this document is a list of abbreviations and acronyms whichmay appear in Weather Prediction Center (WPC) discussions. Use the alphabetical index below or scroll through the entire list.

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

State AbbreviationsForecast Models
View additional definitions of meteorological terms and abbreviations at the newNational Weather Service Glossary

A
A	ARCTIC
ABNDT	ABUNDANT
ABT	ABOUT
ABV	ABOVE
ACCUM	ACCUMULATE
ACLT	ACCELERATE
ACPT	ACCEPT
ACRS	ACROSS
ACTV	ACTIVE
ACYC	ANTICYCLONIC
ADDN	ADDITION
ADJ	ADJACENT
ADQT	ADEQUATE
ADRNDCK	ADIRONDACK
ADVCTN	ADVECTION
ADVN	ADVANCE
AFCT	AFFECT
AFT	AFTER
AFTN	AFTERNOON
AGRMT	AGREEMENT
AHD	AHEAD
ALF	ALOFT
ALG	ALONG
ALQDS	ALL QUADRANTS
ALTA	ALBERTA
AM	ANTE MERIDIEM
AMPLTD	AMPLITUDE
AMS	AIR MASS
AMT	AMOUNT
AOA	AT OR ABOVE
AOB	AT OR BELOW
APCH	APPROACH
APLCN	APPALACHIAN
APRNT	APPARENT
APRX	APPROXIMATE
ARND	AROUND
ASL	ABOVE SEA LEVEL
ATLC	ATLANTIC
ATTM	AT THIS TIME
AVBL	AVAILABLE
AVG	AVERAGE
AVN	AVIATION MODEL
AWT	AWAIT or AWAITING

B
B	BLUE
BC	PATCHES
BC	BRITISH COLUMBIA
BCH	BEACH
BCKG	BACKING
BCM	BECOME
BDA	BERMUDA
BDR	BORDER
BFDK	BEFORE DARK
BFR	BEFORE
BGN	BEGAN or BEGIN
BHND	BEHIND
BKN	BROKEN
BL	BLOWING
BLD	BUILD
BLDG	BUILDING
BLDU	BLOWING DUST
BLDUP	BUILDUP
BLKHLS	BLACK HILLS
BLO	BELOW
BLSA	BLOWING SAND
BLSN	BLOWING SNOW
BLZD	BLIZZARD
BNDRY	BOUNDARY
BOMB	BOMBING
BR	BRANCH
BR	MIST
BRF	BRIEF
BRGT	BRIGHT
BRK	BREAK
BRKSHR	BERKSHIRE
BTR	BETTER
BTWN	BETWEEN
BY	BLOWING SPRAY
BYD	BEYOND

C
C	CELSIUS
C	CONTINENTAL AIR MASS
CAA	COLD AIR ADVECTION
CAN	CANADA
CARIB	CARIBBEAN
CASCDS	CASCADES
CB	CUMULONIMBUS
CCLKWS	COUNTERCLOCKWISE
CDFNT	COLD FRONT
CENPAC	CENTRAL NORTH PACIFIC
CFN	CONFINE
CFP	COLD FRONT PASSAGE
CHC	CHANCE
CHG	CHANGE
CHGO	CHANGING OVER
CHSPK	CHESAPEAKE
CI	CIRRUS
CIG	CEILINGS
CLD	CLOUD
CLR	CLEAR BELOW 12,000 FEET
CLKWS	CLOCKWISE
CLSD	CLOSED
CMA	COMMA
CMNC	COMMENCE
CMPCT	COMPACT
CMPLX	COMPLEX
CNCT	CONNECT
CNDN	CANADIAN
CNTR	CENTER
CNTRL	CENTRAL
CNVG	CONVERGE
CNVTV	CONVECTIVE
COMB	COMBINE
COMPR	COMPARE
CONC	CONCRETE
COND	CONDITION
CONFDC	CONFIDENCE
CONS	CONTINUES
CONT	CONTINUES or CONTINUOUSLY
CONTDVD	CONTINENTAL DIVIDE
COORD	COORDINATES
COR	CORRECT or CORRECTED or CORRECTION
COT	AT THE COAST
CPBL	CAPABLE
CPD	COUPLED
CRC	CIRCLE
CRLC	CIRCULATE
CRZ	CRUISE
CSDR	CONSIDER
CSDRBL	CONSIDERABLE
CST	COAST
CTSKLS	CATSKILLS
CU	CUMULUS
CUF	CUMULIFORM
CVR	COVER
CWA	COUNTY WARNING AREA
CYC	CYCLONIC
CYCLGN	CYCLOGENESIS

D
DABRK	DAYBREAK
DALGT	DAYLIGHT
DBL	DOUBLE
DBTF	DOUBTFUL
DC	DISTRICT OF COLUMBIA
DCLRT	DECELERATE
DCR	DECREASE
DCT	DIRECT
DEG	DEGREE
DEP	DEPARTURE
DESTN	DESTINATION
DEV	DEVIATION
DFCLT	DIFFICULT
DFNT	DEFINITE
DFRS	DIFFERS
DFUS	DIFFUSE
DGR	DANGER
DIAM	DIAMETER
DIF	DIFFUSE
DISC	DISCONTINUE
DIST	DISTANCE
DIST	DISTRICT
DIV	DIVERT or DIVISION
DKTS	DAKOTAS
DLA	DELAY
DLT	DELETE
DLVR	DELIVER
DLY	DELAY
DMG	DAMAGE
DMNT	DOMINANT
DMSH	DIMINISH
DNS	DENSE
DNSLP	DOWNSLOPE
DNSTRM	DOWNSTREAM
DNWND	DOWNWIND
DP	DEEP
DPNG	DEEPENING
DPTH	DEPTH
DR	LOW DRIFTING
DRCT	DIRECT
DRCTN	DIRECTION
DRDU	LOW DRIFTING DUST
DRFT	DRIFT
DRG	DURING
DRSA	LOW DRIFTING SAND
DRSN	LOW DRIFTING SNOW
DRZL	DRIZZLE
DS	DUST STORM
DSIPT	DISSIPATE
DSNT	DISTANT
DSRGD	DISREGARD
DST	DISTORT
DSTC	DISTANCE
DSTND	DESTINED
DTL	DETAIL
DTRM	DETERMINE
DTRT	DETERIORATE
DU	WIDESPREAD DUST
DUR	DURATION
DURG	DURING
DURN	DURATION
DVLP	DEVELOP
DVRG	DIVERGE
DVRSN	DIVERSION
DVV	DOWNWARD VERTICAL VELOCITY
DWPNT	DEWPOINT
DZ	DRIZZLE

E
E	EAST or EASTERN LONGITUDE
E	EQUATORIAL AIR MASS
EBND	EASTBOUND
EFCT	EFFECT
ELEV	ELEVATE or ELEVATION
ELIP	ELLIPTICAL
ELNGT	ELONGATE
ELSW	ELSEWHERE
ELY	EASTERLY
EMBDD	EMBEDDED
ENDG	ENDING
ENE	EAST-NORTH EAST
ENERN	EAST-NORTHEASTERN
ENEWD	EAST-NORTHEASTWARD
ENHNCD	ENHANCED
ENHNCMNT	ENHANCEMENT
ENRT	EN ROUTE
ENTR	ENTIRE
ERN	EASTERN
ERY	EARLY
ESE	EAST-SOUTH EAST
ESERN	EAST-SOUTHEASTERN
ESEWD	EAST-SOUTHEASTWARD
ESNTL	ESSENTIAL
ETC	ET CETERA
EVAL	EVALUATE or EVALUATION
EVE	EVENING
EXCLD	EXCLUDE
EXCLV	EXCLUSIVE
EXCP	EXCEPT
EXPC	EXPECT
EXPS	EXPRESS
EXTD	EXTEND
EXTN	EXTENSION
EXTRM	EXTREME
EXTSV	EXTENSIVE

F
FA	AREA FORECAST
FAH	FAHRENHEIT
FC	FUNNEL CLOUD
+FC	TORNADO or WATERSPOUT
FCST	FORECAST
FG	FOG (under 5/8 mile visibility)
FIG	FIGURE
FLCTN	FLUCTUATION
FLDST	FLOOD STAGE
FLG	FALLING
FLRY	FLURRY
FLUC	FLUCTUATING
FLW	FOLLOW
FLWIS	FLOOD WARNING ISSUED
FM	FROM
FNCTN	FUNCTION
FNT	FRONT
FNTGNS	FRONTOGENESIS
FNTLYS	FRONTOLYSIS
FORNN	FORENOON
FRMG	FORMING
FQT	FREQUENT
FRMG	FORMING
FROPA	FRONTAL PASSAGE
FRZ	FREEZE
FRZLVL	FREEZING LEVEL
FRZN	FROZEN
FT	FOOT or FEET
FTHR	FARTHER or FURTHER
FU	SMOKE
FWD	FORWARD
FZ	SUPERCOOLED or FREEZING
FZDZ	FREEZING DRIZZLE
FZFG	FREEZING FOG
FZRA	FREEZING RAIN

G
GEN	GENERAL
GLFALSK	GULF OF ALASKA
GLFCAL	GULF OF CALIFORNIA
GLFMEX	GULF OF MEXICO
GLFSTLAWR	GULF OF ST. LAWRENCE
GMT	GREENWICH MEAN TIME
GND	GROUND
GNDFG	GROUND FOG
GR	HAIL OF 1/4' DIAMETER OR MORE
GRAD	GRADIENT
GRBNKS	GRAND BANKS
GRDL	GRADUAL
GRTLKS	GREAT LAKES
GS	SNOW PELLETS or HAIL UNDER 1/4' IN DIAMETER
GSTS	GUSTS
GSTY	GUSTY
GTR	GREATER

H
HAZ	HAZARD
HCVIS	HIGH CLOUDS VISIBLE
HDFRZ	HARD FREEZE
HDSVLY	HUDSON VALLEY
HGT	HEIGHT
HI	HIGH
HIEAT	HIGHEST TEMPERATURE EQUALED FOR ALL TIME
HIEFM	HIGHEST TEMPERATURE EQUALED FOR THE MONTH
HIESE	HIGHEST TEMPERATURE EQUALED SO EARLY
HIESL	HIGHEST TEMPERATURE EQUALED SO LATE
HITMP	HIGHEST TEMPERATURE
HIXAT	HIGHEST TEMPERATURE EXCEEDED FOR ALL TIME
HIXSE	HIGHEST TEMPERATURE EXCEEDED SO EARLY
HIXSL	HIGHEST TEMPERATURE EXCEEDED SO LATE
HLF	HALF
HLSTO	HAILSTONES
HOL	HOLIDAY
HPA	HECTOPASCAL
HR	HERE or HOUR
HRZN	HORIZON
HURCN	HURRICANE
HVY	HEAVY
HWVR	HOWEVER
HYR	HIGHER
HZ	HAZE

I
IC	ICE CRYSTALS
ICG	ICING
IMDT	IMMEDIATE
IMP	IMPRACTICABLE
IMPL	IMPULSE
IMPR	IMPROVE
IMPT	IMPORTANT
IMT	IMMEDIATE or IMMEDIATELY
IN	INCH
INADQT	INADEQUATE
INCL	INCLUDE
INCLV	INCLUSIVE
INCOMP	INCOMPLETE
INCOR	INCORRECT
INCR	INCREASE
INDC	INDICATE
INDEF	INDEFINITE
INFO	INFORMATION
INLD	INLAND
INSTBY	INSTABILITY
INTCNTL	INTERCONTINENTAL
INTCP	INTERCEPT
INTMT	INTERMITTENT
INTR	INTERIOR
INTRMTRGN	INTERMOUNTAIN REGION
INTS	INTENSE
INTSFY	INTENSIFY
INTXN	INTERSECTION
INVOF	IN THE VICINITY OF
INVRN	INVERSION
IPV	IMPROVE
IS	ISLAND
ISOL	ISOLATE

J
JCTN	JUNCTION
JTSTR	JET STREAM

K
K	COLD AIR MASS
KFRST	KILLING FROST
KM	KILOMETERS
KT	KNOTS

L
LABRDR	LABRADOR
LAT	LATITUDE
LCLY	LOCALLY
LCT	LOCATE
LFT	LIFT
LGT	LIGHT
LGWV	LONGWAVE
LK	LAKE
LKLY	LIKELY
LLWS	LOW LEVEL WIND SHEAR
LMT	LIMIT
LN	LINE
LND	LAND
LOC	LOCALLY
LOEAT	LOWEST TEMPERATURE EQUALED FOR ALL TIME
LOEFM	LOWEST TEMPERATURE EQUALED FOR THE MONTH
LOESE	LOWEST TEMPERATURE EQUALED SO EARLY
LOESL	LOWEST TEMPERATURE EQUALED SO LATE
LONG	LONGITUDE
LOTMP	LOWEST TEMPERATURE
LOXAT	LOWEST TEMPERATURE EXCEEDED FOR ALL TIME
LOXFM	LOWEST TEMPERATURE EXCEEDED FOR THE MONTH
LOXSE	LOWEST TEMPERATURE EXCEEDED SO EARLY
LOXSL	LOWEST TEMPERATURE EXCEEDED SO LATE
LRG	LARGE or LONG RANGE
LTL	LITTLE
LTLCG	LITTLE CHANGE
LTNG	LIGHTNING
LTR	LATER
LTTR	LATTER
LV	LEAVE
LVG	LEAVING
LVL	LEVEL
LWR	LOWER
LYR	LAYER OR LAYERED OR LAYERS

M
M	MARITIME AIR MASS
MA	MAP ANALYSIS
MAN	MANITOBA or MANUAL
MAX	MAXIMUM
MB	MILLIBARS
MDFY	MODIFY
MDT	MODERATE
MEGG	MERGING
MET	METEOROLOGICAL
METRO	METROPOLITAN
MEX	MEXICO
MHKVLY	MOHAWK VALLEY
MI	MILE or SHALLOW
MID	MIDDLE
MIDN	MIDNIGHT
MIDPT	MIDPOINT
MIFG	PATCHES OF SHALLOW FOG LESS THAN TWO METERS IN DEPTH
MIN	MINIMUM or MINUTE
MISG	MISSING
MLTLVL	MELTING LEVEL
MNLD	MAINLAND
MNLY	MAINLY
MONTR	MONITOR
MOS	MODEL OUTPUT STATISTICS
MOV	MOVE
MPH	MILES PER HOUR
MRG	MEDIUM RANGE
MRGL	MARGINAL
MRNG	MORNING
MRTM	MARITIME
MSL	MEAN SEA LEVEL
MSTR	MOISTURE
MSTLY	MOSTLY
MSTR	MOISTURE
MTN	MOUNTAIN
MTRY	MOMENTARY
MULT	MULTIPLE
MXD	MIXED

N
N	NORTH or NORTHERN LATITUDE
NAR	NOT ACCORDING TO ROUTINE
NAT	NORTH ATLANTIC
NATL	NATIONAL
NB	NEW BRUNSWICK
NBND	NORTHBOUND
NBRHD	NEIGHBORHOOD
NC	NO CHANGE
NE	NORTHEAST
NB	NORTHBOUND
NEG	NEGATIVE
NELY	NORTHEASTERLY
NERN	NORTHEASTERN
NEWD	NORTHEASTWARD
NEW ENG	NEW ENGLAND
NFLD	NEWFOUNDLAND
NGT	NIGHT
NLT	NO LATER THAN
NLY	NORTHERLY
NM	NAUTICAL MILE
NMBR	NUMBER
NML	NORMAL
NMRS	NUMEROUS
NNE	NORTH-NORTH EAST
NNERN	NORTH-NORTHEASTERN
NNEWD	NORTH-NORTHEASTWARD
NNW	NORTH-NORTH WEST
NNWRN	NORTH-NORTHWESTERN
NNWWD	NORTH-NORTHWESTWARD
NOPAC	NORTH PACIFIC
NOSIG	NO SIGNIFICANT CHANGE
NR	NEAR
NRN	NORTHERN
NRW	NARROW
NS	NOVA SCOTIA or NIMBOSTRATUS
NTE	NOT TO EXCEED
NVA	NEGATIVE VORTICITY ADVECTION
NW	NORTHWEST
NWB	NORTHWEST BOUND
NWD	NORTHWARD
NWLY	NORTHWESTERLY
NWRN	NORTH-WESTERN
NWS	NATIONAL WEATHER SERVICE
NWWD	NORTHWESTWARD

O
OBS	OBSERVATION
OBSC	OBSCURE
OCFNT	OCCLUDED FRONT
OCLD	OCCLUDE
OCLN	OCCLUSION
OCNL	OCCASIONAL
OCR	OCCUR
OFP	OCCLUDED FRONTAL PASSAGE
OFSHR	OFFSHORE
OMTS	OVER MOUNTAINS
ONSHR	ONSHORE
ONT	ONTARIO
OPN	OPEN
ORGPHC	OROGRAPHIC
OTLK	OUTLOOK
OTR	OTHER
OTRW	OTHERWISE
OVC	OVERCAST
OVD	OVERDUE
OVHD	OVERHEAD
OVNGT	OVERNIGHT
OVR	OVER
OVRN	OVERRUN

P
P	POLAR AIR MASS
PAC	PACIFIC
PARL	PARALLEL
PAT	PATTERN
PBL	PROBABLE
PCPN	PRECIPITATION
PD	PERIOD
PDMT	PREDOMINANT or PREDOMINATE
PEN	PENINSULA
PGTSND	PUGET SOUND
PL	ICE PELLETS
PM	POST MERIDIEM
PMT	PERMIT
PNHDL	PANHANDLE
PO	DUST DEVIL
POP	PROBABILITY OF PRECIPITATION
PPINE	RADAR REPORT WITH NO ECHOES OBSERVED
PR	PARTIAL
PRBLTY	PROBABILITY
PRCTN	PRECAUTION
PRECD	PRECEDE
PRES	PRESSURE
PREV	PREVIOUS
PRIN	PRINCIPAL
PRIND	PRESENT INDICATIONS ARE
PROCD	PROCEED
PROG	PROGNOSIS or PROGNOSTIC or PROGRESS
PROPA	PROPAGATION
PRSNT	PRESENT
PRST	PERSIST
PSBL	POSSIBLE
PSG	PASSAGE or PASSING
PSN	POSITION
PST	PACIFIC STANDARD TIME
PTCHY	PATCHY
PTLY	PARTLY
PTN	PORTION
PVA	POSITIVE VORTICITY ADVECTION
PVL	PREVAIL
PWR	POWER
PY	SPRAY

Q
QLFY	QUALIFY
QLTY	QUALITY
QN	QUESTION
QNTY	QUANTITY
QPF	QUANTITATIVE PRECIPITATION FORECAST
QSTNRY	QUASISTATIONARY
QTR	QUARTER
QUAD	QUADRANT
QUE	QUEBEC

R
RA	RAIN
RAOB	RAWINSONDE OBSERVATION
RCH	REACH
RCKY	ROCKIES (MOUNTAINS)
RCMD	RECOMMEND
RCRD	RECORD
RCV	RECEIVE
RDC	REDUCE
RDG	RIDGE
RECON	RECONNAISSANCE
REF	REFERENCE
RELBL	RELIABLE
RESP	RESPONSE
RESTR	RESTRICT
RGD	RAGGED
RGLR	REGULAR
RGN	REGION
RH	RELATIVE HUMIDITY
RIOGD	RIO GRANDE
RLS	RELEASE
RLTV	RELATIVE
RMN	REMAIN
RNFL	RAINFALL
ROT	ROTATE
RPD	RAPID
RSG	RISING
RSN	REASON
RSTR	RESTRICT
RSVN	RESERVATION
RTRD	RETARD
RTRN	RETURN

S
S	SOUTH or SOUTHERN LATITUDE
SA	SANDSTORM or DUSTSTORM
SASK	SASKATCHEWAN
SATFY	SATISFY or SATISFACTORY
SB	SOUTHBOUND
SBSD	SUBSIDE
SC	STRATOCUMULUS
SCND	SECOND (IN A SERIES)
SCT	SCATTERED
SCTR	SECTOR
SE	SOUTHEAST
SEB	SOUTHEAST BOUND
SEC	SECOND (FRACTION OF A MINUTE)
SELS	SEVERE LOCAL STORMS
SELY	SOUTHEASTERLY
SEPN	SEPARATION
SEQ	SEQUENCE
SERN	SOUTHEASTERN
SEV	SEVERE
SEWD	SOUTHEASTWARD
SFC	SURFACE
SFERICS	ATMOSPHERICS
SG	SNOW GRAINS
SGFNT	SIGNIFICANT
SGL	SIGNAL
SHFT	SHIFT
SHGR	HAIL SHOWERS (>=1/4' DIAMETER)
SHGS	HAIL SHOWERS (<1/4' DIAMETER)
SHLW	SHALLOW
SHPL	ICE PELLET SHOWERS
SHRA	RAIN SHOWERS
SHRT	SHORT
SHRTLY	SHORTLY
SHRTWV	SHORTWAVE
SHSN	SNOW SHOWER
SHUD	SHOULD
SHWR	SHOWER
SIERNEV	SIERRA NEVADA
SIG	SIGNATURE
SIGWX	SIGNIFICANT WEATHER
SKC	SKY CLEAR
SL	SEA LEVEL or SICK LEAVE
SLCT	SELECT
SLD	SOLID
SLGT	SLIGHT
SLO	SLOW
SLT	SLEET
SLP	SEA LEVEL PRESSURE
SLY	SOUTHERLY
SM	STATUTE MILE
SML	SMALL
SMRY	SUMMARY
SMTH	SMOOTH
SMTM	SOMETIME
SMWHT	SOMEWHAT
SN	SNOW
SNBNK	SNOWBANK
SNFLK	SNOWFLAKE
SNGL	SINGLE
SNOINCR	SNOW DEPTH INCREASE IN PAST HOUR
SNW	SNOW
SNWFL	SNOWFALL
SP	STATION PRESSURE
SPCLY	ESPECIALLY
SPD	SPEED
SPKL	SPRINKLE
SPLNS	SOUTH PLAINS
SPRD	SPREAD
SQ	SQUALL
SQLN	SQUALL LINE
SR	SUNRISE
SRCH	SEARCH
SRND	SURROUND
SS	SANDSTORM
SSE	SOUTH-SOUTHEAST
SSERN	SOUTH-SOUTHEASTERN
SSEWD	SOUTH-SOUTHEASTWARD
SSW	SOUTH-SOUTHWEST
SSWRN	SOUTH-SOUTHWESTERN
SSWWD	SOUTH-SOUTHWESTWARD
ST	STRATUS
STAGN	STAGNATION
STBL	STABLE
STDY	STEADY
STFRA	STRATUS FRACTUS
STFRM	STRATIFORM
STG	STRONG
STLT	SATELLITE
STM	STORM
STNRY	STATIONARY
SUF	SUFFICIENT
SUG	SUGGEST
SUP	SUPPLY
SUPR	SUPERIOR
SVR	SEVERE
SVRL	SEVERAL
SW	SOUTHWEST
SWB	SOUTHWEST BOUND
SWD	SOUTHWARD
SWLG	SWELLING
SWLY	SOUTHWESTERLY
SWRN	SOUTHWESTERN
SXN	SECTION
SYS	SYSTEM

T
TAND	TANDUM
TC	TROPICAL CYCLONE
TCU	TOWERING CUMULUS
TDA	TODAY
TELCO	TELEPHONE COMPANY
TEMP	TEMPERATURE
THD	THUNDERHEAD
THDR	THUNDER
THK	THICK
THN	THIN
THRFTR	THEREAFTER
THRU	THROUGH
THRUT	THROUGHOUT
THSD	THOUSAND
THTN	THREATEN
TIL	UNTIL
TMPRY	TEMPORARY
TMT	TRANSMIT
TMW	TOMORROW
TNDCY	TENDENCY
TNGT	TONIGHT
TNTV	TENTATIVE
TOP	CLOUD TOP
TPG	TOPPING
TRBL	TROUBLE
TRIB	TRIBUTARY
TRNSP	TRANSPORT
TROF	TROUGH
TROP	TROPOPAUSE
TRPCD	TROPICAL CONTINENTAL AIR MASS
TRPCL	TROPICAL
TRRN	TERRAIN
TSFR	TRANSFER
TSGR	THUNDERSTORM WITH HAIL OF 1/4' OR MORE IN DIAMETER
TSGS	THUNDERSTORM WITH HAIL LESS THAN 1/4' IN DIAMETER
TSPAC	TRANSPACIFIC
TSRA	THUNDERSTORM WITH RAIN
TSTM	THUNDERSTORM
TURBT	TURBULENT
TVL	TRAVEL
TWD	TOWARD
TWI	TWILIGHT
TWR	TOWER
TYPH	TYPHOON

U
UFN	UNTIL FURTHER NOTICE
UN	UNABLE
UNAVBL	UNAVAILABLE
UNEC	UNNECESSARY
UNHRD	UNHEARD
UNKN	UNKNOWN
UNL	UNLIMITED
UNRELBL	UNRELIABLE
UNSBL	UNSEASONABLE
UNSTBL	UNSTABLE
UNSTDY	UNSTEADY
UNSTL	UNSETTLE
UNUSBL	UNUSABLE
UP	UP or UNKNOWN PRECIPITATION
UPR	UPPER
UPSLP	UPSLOPE
UPSTRM	UPSTREAM
URG	URGENT
USBL	USABLE
UTC	COORDINATED UNIVERSAL TIME
UVV	UPWARD VERTICAL VELOCITY
UWNDS	UPPER WINDS

V
VA	VOLCANIC ASH
VARN	VARIATION
VCFG	FOG IN VICINITY
VCNTY	VICINITY
VFY	VERIFY
VIA	BY WAY OF
VIS	VISIBILITY
VLCTY	VELOCITY
VLNT	VIOLENT
VLY	VALLEY
VOT	VORTICITY
VR	VEER
VRBL	VARIABLE
VRISL	VANCOUVER ISLAND
VRT MOTN	VERTICAL MOTION
VSBY	VISIBILITY

W
W	WARM AIR MASS or WHITE or WEST or WESTERN LONGITUDE
WAA	WARM AIR ADVECTION
WB	WESTBOUND
WBTS	WHEREABOUTS
WDLY	WIDELY
WDSPRD	WIDESPREAD
WEA	WEATHER
WFP	WARM FRONT PASSAGE
WI	WITHIN
WINT	WINTER
WK	WEAK
WKDAY	WEEKDAY
WKEND	WEEKEND
WKN	WEAKEN
WL	WILL
WND	WIND
WNW	WEST-NORTH WEST
WNWRN	WEST-NORTHWESTERN
WNWWD	WEST-NORTHWESTWARD
WO	WITHOUT
WPC	WEATHER PREDICTION CENTER
WPLTO	WESTERN PLATEAU
WRM	WARM
WRMFNT	WARM FRONT
WRN	WESTERN
WRNG	WARNING
WRS	WORSE
WS	WIND SHEAR
WSHFT	WIND SHIFT
WSTCH	WASATCH RANGE
WSW	WEST-SOUTHWEST
WSWRN	WEST-SOUTHWESTERN
WSWWD	WEST-SOUTHWESTWARD
WTSPT	WATERSPOUT
WV	WAVE
WWD	WESTWARD
WWW	WORLD WIDE WEB
WX	WEATHER

X
XCP	EXCEPT
XPC	EXPECT
XPLOS	EXPLOSIVE

Y
YDA	YESTERDAY
YKN	YUKON
YLSTN	YELLOWSTONE

Z
Z	GREENWICH MEAN TIME
ZI	ZONAL INDEX
ZRNO	FREEZING RAIN INFORMATION NOT AVAILABLE

Occasional Weather Meaning

Numerical Forecast Models
CMC	Canadian Meteorological Centre
ECMWF	European Centre for Medium-Range Weather Forecasts
GEM	Global Environment Multiscale (CMC's short-range model)
GFDL	Geophysical Fluid Dynamics Laboratory's Hurricane Model
GFS	Global Forecast System (formerly known as the AVN and MRF)
MM5	Penn State University/National Center for Atmospheric Research's Mesoscale Model
NAM	North American Mesoscale (formerly known as the Eta)
NAVGEM	NAVy Global Environment Model
NGM	Nested Grid Model
NOGAPS	Navy Operational Global Atmospheric Prediction System
RUC	Rapid Update Cycle Forecast Model
SREF	Short Range Ensemble Forecasts
UKMET	United Kingdom Meteorological Office

Two-letter State and Territory Abbreviations
AL	Alabama	LA	Louisiana	OH	Ohio
AK	Alaska	ME	Maine	OK	Oklahoma
AZ	Arizona	MD	Maryland	OR	Oregon
AR	Arkansas	MA	Massachusetts	PA	Pennsylvania
CA	California	MI	Michigan	PR	Puerto Rico
CO	Colorado	MN	Minnesota	RI	Rhode Island
CT	Connecticut	MS	Mississippi	SC	South Carolina
DE	Delaware	MO	Missouri	SD	South Dakota
DC	District of Columbia	MT	Montana	TN	Tennessee
FL	Florida	NE	Nebraska	TX	Texas
GA	Georgia	NV	Nevada	UT	Utah
HI	Hawaii	NH	New Hampshire	VT	Vermont
ID	Idaho	NJ	New Jersey	VA	Virginia
IL	Illinois	NM	New Mexico	WA	Washington
IN	Indiana	NY	New York	WV	West Virginia
IA	Iowa	NC	North Carolina	WI	Wisconsin
KS	Kansas	ND	North Dakota	WY	Wyoming
KY	Kentucky

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Also found in: Thesaurus, Acronyms.

oc·ca·sion·al

(ə-kā′zhə-nəl)

Occasional Weather Station

adj.

occasional

(əˈkeɪʒənəl) adj

oc•ca•sion•al

(əˈkeɪ ʒə nl)
adj.

Adj.	1.	occasional - occurring from time to time; 'took an occasional glass of wine' infrequent - not frequent; not occurring regularly or at short intervals; 'infrequent outbursts of temper'
2.	occasional - occurring or appearing at usually irregular intervals; 'episodic in his affections'; 'occasional headaches' unpredictable - not capable of being foretold
3.	occasional - occurring from time to time; 'casual employment'; 'a casual correspondence with a former teacher'; 'an occasional worker' irregular - contrary to rule or accepted order or general practice; 'irregular hiring practices'
4.	occasional - recurring or reappearing from time to time; 'periodic feelings of anxiety' sporadic - recurring in scattered and irregular or unpredictable instances; 'a city subjected to sporadic bombing raids'

occasional

occasional

adjective1. Happening or appearing now and then:2. Rarely occurring or appearing:

occasional

[əˈkeɪʒənl]A.ADJ

occasional

[əˈkeɪʒən^əl]adj

occasional

adj

occasional

[əˈkeɪʒənl]adj (gen) → occasionale; (showers) → sporadico/a
I like the occasional cigarette → ogni tanto mi piacefumare una sigaretta

occasion

(əˈkeiʒən) nounocˈcasional adjectiveocˈcasionally adverb

occasional

→ مِن وَقْتٍ لِآخَرِ příležitostný lejlighedsvisgelegentlichπεριστασιακόςesporádico satunnainenoccasionnel povremenoccasionale 時折の 가끔의incidenteelsporadiskokazyjnyde vez em quandoслучайный tillfällig ซึ่งเป็นครั้งคราวara sıra thỉnh thoảng偶尔的

Weather Occasional

occasional

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Occasional Definition Weather

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Occasional Weather