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Annex 3 - Meteorological Service for International Air Navigation
Model VAG Volcanic ash advisory information in graphical format
FL200
SURFACE
FIXED TIME PROGNOSTIC CHART VALID.. .......U TC.. ..... .20.. . FIXED TIME PROGNOSllC CHART VALID. ........U TC. .......M. .
(ERUPTION + U M BASED ON ......U TC DATA ON. ....M ... (ERUPTION r W H) BASED ON. .... UTC DATA ON .....2. 0..
fiWrn- ...........k. .~ ( a.~ l ~.o. ..n.E g( ~ W
~ a u m d a n a d ~ ~ s - ...........U TC ...... .w...
Duamn .........W l)
Haght d ash m*nn of FL.
.U~~aYlcknd
FL550
SURFACE
(COMPOSITE)
APP 1-15
1. Symbols for significant weather
Madel SN. Shaf of notdons used in lligbt daeumenIafloa
3. Abbreviations used to describe clouds Conversion of knots into kilometres per hour
3.1 Type
CI - cirrus cc - cirroCumuiUs AS = Amsuatus ST - Stratus
CS = Cimo~stus NS = NimboYTatus CU = Cumulus
AC = Alto~~muiUS SC = Stratacumulus CB - Cumuian8mbus
3.2 Amount
C b d s except CB
SKC = sky clear (WB)
FEW = few (118 to UB)
SCT - scattered (318 w 418)
BKN = bmkn (5lE to 7181
OVC - overcaa(tv81
CISBO oLn ly= IndiuldUal CBS (isolated) ,
OCNL = well-separated CBs (acca~10naO
FRO = CBs with lntle or no waradan lhequenq
EMBO = CBs embedded In layers of other clouds or concealed by haze (embedded)
3.3 Heigh
Heights areindicated on SWH and SWM chart3 ~n flight leueis (FL). tap over base.
when XXX 15 used. t q x a bases are outside the l s y o~f t he atmospwe to wnlch the
chart applies.
In SWL cham:
1) ~;g;~bg,;~;;$g~~%~~;~~;~;;~"$~~l.
~ n w ~ ~ ~ - ~ ~ ~ f l m w ~m"5sOYm-Im-ox*w~rmF-. L ~ m 4. Depicting of lines and systems on specific charts
" m l d l l u n " O ~ o n l ~ b . - a t w Y I Y I o I w - r a d , ~ - I I r m ~ .
~.-rmpnla~a.rnd~.ae~& brnnam- r r r c l ~ o r ~ ~ t ~ r u a e n - m 4.1 MDdels SWH and SWM - SigMmm watw cham(hiih and medum) ... rmtdlans I-- s m m a m ~ - mLm~IInwmuo unsm-. Scatloped line = demarcatlon of areas of signdcant weathw
n a r n l l d m ~ - t n n * l d ~ M I M 1 ~ - , ~ ~ t ~ ~ s nHdeavry nbro ken line - delineation of area of CAT
amm6lbarn. Heavy solid line - pornan ofjet Neam axts with indlcatlon of wlnd direction.
C ~ I S ~ S ~ N O T I M ~ ~ ~ H T * M ~ ~ - ~ ~ * ~ ~ lnt~ruptedb y wrnd sped in kt or kmlh and height in Right lewir. ThewRld -- Tl.rsp~-mrarm,omdllw wplpl~m-nm--m~kknr*rhb armw and nlght lewi went of thejet Neam is lndlcated (mflight levele) below
a ~ a w l a v r e the night led. e.g FL270 accompanied by +201-30 Indicates ..... msbts a* I- I~FIIPS~UY w -PI YAG nac o PIGWX CMm
that the height of thejet exfendsfmm FL24O to FL290.
F~gureso n arrows - speed ~n kt or kmlh of mowem- of frontal system
NOTE: ~ s 9 1 1 m 6 ~ 1 0 n s 1 l m~na ~r npn mme~am ~xP~(?~.IoPB- mseaswc C M R ~ W ~ F I ~ ~leMve l5 = hetght in R~ghtlevelso f tmpopause at spot lacatlons, e.g
insae small rectangles a.Law and htgh palnts of me tmpopause topography
2. Fronts and convergence zones and other symbols are lndlcsted by the letters Lor H, respectively, lnside a
used pentagon wM the height m nlght levels.
0 1 2 3 4 5 6 7 8 B
Kilomeues per hour
1 knot = 1.852 kilometres per hour
0 I 5 IO 75 ,m 121 110 175 m0
t - I - - knots
4.2 Model SWL - Significant weather charts (low level) : -= posnion of pressure centres glven In henopascals ceMre of law pressure
H = cmtre or high pressure
Scalloped lines - demarcateon of area of significant weather
Dashed lines aitltude of O'C lmtherm ~n feet (henofee0 or mews
NOTE: O'C level may also be indrated by m,i.e . O'C
l e d is af an alWude of 6 000 R
Figures on amowg = speed in kt or kwh of movement of frontal systems.
depressions or anticyclones
Flgure instdefhe sfateof me sea symbol = lam1 wave height 8n feet or metres
Figure inside the sea-surface temperature synbol = sea-rllrfafscete mperature m 'C
Figures insode the stmng surfacewind symbol = wind m kt or kmh
4.3 Arrows. feathers and pennam
Amom Indicate direcf~on. Number of pennants andlor feathers correspond to speed.
Example:
k 270.1115 kt Ieq~lvalentto 21 3 kmhl
Pennants correspond to 50 kt or 93 kmlh
Featherscorrespondto 10 kt or 18 m l h
Half.feamers correspond to 5 kt or 9 kmlh
A warm lD",
at tne sununune - ::z%:&"
~ ~ , " . " ~ i ~ z F = . " ~ e
Tropopause Hngh
rmpopavse Low
~mpopause~ e d
- * rt 2m z%"ge."dnd - C o " ~ c " ' " e
Freezhlg leM
F:z9zazm
Smle olthe sea
:e:;sgtz
@ gP,"g%?&eund.
- -Fr ua .L-wa Wlmrr-lm-rne-murnUmn aammw. N-acvnsnI murr
3
T&%anY k6"gkTJai$&;g WeglmIIMM MM MM Cd3tS W- 8 uM
　
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