JEPPESEN GENERAL AIRWAY MANUAL (Issue Date 1 JUL 21)

WIND SPEED

The wind speed shall be reported in meters per second or knots, rounded to the nearest 1m/s
(1kt). The units of measurement used for the wind speed shall be indicated.

WIND QUALITY FLAG

The wind quality flag shall be reported as 0 when the roll angle is less than 5 degrees and as 1
when the roll angle is 5 degrees or more.

AIR TEMPERATURE

The air temperature shall be reported to the nearest tenth of a degree Celsius.

TURBULENCE

The turbulence shall be reported in terms of the cube root of the Eddy Dissipation Rate (EDR).

Routine Air-reports

The turbulence shall be reported during the en-route phase of the flight and shall refer to the 15-
minute period immediately preceding the observation. Both the average and peak value of turbu-
lence, together with the time of occurrence of the peak value to the nearest minute, shall be
observed. The average and peak values shall be reported in terms of the cube root of EDR. The
time of occurrence of the peak value shall be reported as indicated in Table A4-2. The turbulence
shall be reported during the climb-out phase for the first 10 minutes of the flight and shall refer to
the 30-second period immediately preceding the observation. The peak value of turbulence shall
be observed.

Interpretation of the Turbulence Report

Turbulence shall be considered:

a. severe when the peak value of the cube root of EDR exceeds 0.7;
b. moderate when the peak value of the cube root of EDR is above 0.4 and below or equal to

0.7;

c. light when the peak value of the cube root of EDR is above 0.1 and below or equal 0.4; and

d. nil when the peak value of the cube root of EDR is below or equal to 0.1.

NOTE: The EDR is an aircraft-independent measure of turbulence. However, the relationship
between the EDR value and the perception of turbulence is a function of aircraft type, and the
mass, altitude, configuration and airspeed of the aircraft. The EDR values given above describe
the severity levels for a medium-sized transport aircraft under typical en-route conditions (i.e. alti-
tude, airspeed and weight).

Special Air-reports

Special air-reports on turbulence shall be made during any phase of the flight whenever the peak
value of the cube root of EDR exceeds 0.4. The special air-report on turbulence shall be made
with reference to the 1-minute period immediately preceding the observation. Both the average
and peak value of turbulence shall be observed. The average and peak values shall be reported

2.3

2.4

2.5

2.6

2.6.1

2.6.2

2.6.3

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in terms of the cube root of EDR. Special air-reports shall be issued every minute until such time
as the peak values of the cube root of EDR fall below 0.4.

HUMIDITY

The humidity shall be reported as the relative humidity, rounded to the nearest whole per cent.
NOTE: The ranges and resolutions for the meteorological elements included in air-reports are
shown in Table A4-3.

Table A4-1. Template for the Special Air-report (Downlink)

Key:

inclusion mandatory, part of every message

inclusion conditional; included whenever available

NOTE: Message to be prompted by the pilot-in-command. Currently only the condition "SEV
TURB" can be automated (see 2.6.3).

Table A4-1. Template for the Special Air-report (Downlink)

Element as specified in

Chapter 5

Detailed Content

Template(s)

Examples

Message type designator
(M)

Type of the air-report (M)

ARS

Aircraft identification (M)

Aircraft radiotelephony call
sign (M)

nnnnnn

VA812

DATA BLOCK 1
Latitude (M)

Latitude in degrees and
minutes (M)

Nnnnn or Snnnn

S4506

Longitude (M)

Longitude in degrees and
minutes (M)

Wnnnnn or Ennnnn

E01056

Level (M)

Flight level (M)

FLnnn or FLnnn to
FLnnn

FL330
FL280 to FL310

Time (M)

Time of occurrence in
hours and minutes (M)

OBS AT nnnnZ

OBS AT 1216Z

DATA BLOCK 2
Wind direction (M)

Wind direction in degrees
true (M)

nnn/

262/

Wind speed (M)

Wind speed in meters per
second (or knots) (M)

nnnMPS (or nnnKT) 40MPS

(080KT)

Wind quality flag (M)

2.7

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Table A4-1. Template for the Special Air-report (Downlink) (continued)

Element as specified in

Chapter 5

Detailed Content

Template(s)

Examples

Air temperature (M)

Air temperature in tenths
of degrees C (M)

T[M]nnn

T127
TM455

Turbulence (C)

Turbulence in hundredths
of m

2/3

-1

and the time of

occurrence of the peak
value (C)

EDRnnn/nn

EDR064/08

Humidity (C)

Relative humidity in per
cent (C)

RHnnn

RH054

DATA BLOCK 3
Condition prompting the
issuance of a special air-
report (M)

SEV TURB
[EDRnnn]

SEV ICE or
SEV MTW or
TS GR

HVY SS

VA CLD [FLnnn/nnn]
or
VA

[MT

nnnnnnnnnn
nnnnnnnnnn] or
MOD TURB
[EDRnnn]

MOD ICE

SEV TURB
EDR076
VA CLD
FL050/100

The time of occurrence to be reported in accordance with Table A4-2.
The turbulence index to be reported in accordance with 2.6.3.
Obscured, embedded or widespread thunderstorms or thunderstorms in squall lines.
Duststorm or sandstorm.
Pre-eruption volcanic activity or a volcanic eruption.

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Table A4-2. Time of Occurrence of the Peak Value to be reported

Peak Value of Turbulence occurring during the one-minute

Period ....... minutes prior to the Observation

Value to be reported

0 - 1

1 - 2

2 - 3

...

13 - 14

14 - 15

No timing information available

Table A4-3. Ranges and Resolutions for the Meteorological Elements included in Air-re-

ports

Element as specified in Chapter 5

Range

Resolution

Wind direction

°true

000 - 360

Wind speed

MPS

00 - 125
00 - 250

2
1

Wind quality flag

(index)

0 - 1

Air temperature

°C

-80 - +60

0.1

Turbulence: routine air-report

2/3

-1

(time of oc-

currence)

0 - 2

0 - 15

0.01

Turbulence: special air-report

2/3

-1

0 - 2

0.01

Humidity

0 - 100

Non-dimensional.

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Appendix 5. Technical Specifications related to Forecasts

(See Chapter 6 of this Annex.)

CRITERIA RELATED TO TAF

TAF FORMAT

1.1.1 TAF shall be issued in accordance with the template shown in Table A5-1 and dissemina-
ted in the TAF code form prescribed by the World Meteorological Organization (WMO).
NOTE: The TAF code form is contained in the Manual on Codes (WMO-No. 306), Volume I.1,
Part A - Alphanumeric Codes.
1.1.2 Recommendation – Until 4 November 2020, TAF should be disseminated in IWZZM GML
form in addition to the dissemination of the TAF in accordance with 1.1.1. As of 5 November
2020, TAF shall be disseminated in IWXXM GML form in addition to the dissemination of the TAF
in accordance with 1.1.1.
NOTE: The technical specifications for IWXXM are contained in the Manual on Codes (WMO-No.
306), Volume I.3, Part D - Representation Derived from Data Models. Guidance on the implemen-
tation of IWXXM is provided in the Manual on the Digital Exchange of Aeronautical Meteorological
Information (Doc 10003).

Table A5-1. Template for TAF

Key:

inclusion mandatory, part of every message

inclusion conditional, dependent on meteorological condition or method of
observation

inclusion optional

NOTE 1: The ranges and resolutions for the numerical elements included in TAF are shown in
Table A5-4 of this Appendix.
NOTE 2: The explanations for the abbreviations used can be found in the Procedures for Air
Navigation Services - ICAO Abbreviations and Codes (PANS-ABC, Doc 8400).

Table A5-1. Template for TAF

Element as

specified in

Chapter 6

Detailed Con-

tent

Template(s)

Examples

Identification
of the type of
forecast (M)

Type of forecast
(M)

TAF or TAF AMD or TAF COR

TAF
TAF AMD

Location indi-
cator (M)

ICAO location
indicator (M)

nnnn

YUDO

1.1

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Table A5-1. Template for TAF (continued)

Element as

specified in

Chapter 6

Detailed Con-

tent

Template(s)

Examples

Time of issue
of forecast
(M)

Day and time of
issue of the fore-
cast in UTC (M)

nnnnnnZ

160000Z

Identification
of a missing
forecast (C)

Missing forecast
identifier (C)

NIL

END OF TAF IF THE FORECAST IS MISSING
Day and peri-
od of validity
of forecast
(M)

Days and period
of the validity of
the forecast in
UTC (M)

nnnn/nnnn

0812/0918

Identification
of a cancelled
forecast (C)

Cancelled fore-
cast identifier
(C)

CNL

END OF TAF IF THE FORECAST IS CANCELLED
Surface wind
(M)

Wind direction
(M)

nnn or VRB

24004MPS;
VRB01MPS
(24008KT);
(VRB02KT)
19005MPS
(19010KT)

Wind speed (M) [P]nn[n]

00000MPS
(00000KT)
140P49MPS
(140P99KT)

Significant
speed variations
(C)

G[P]nn[n]

12003G09MPS
(12006G18KT)
24008G14MPS
(24016G28KT)

Units of meas-
urement (M)

MPS (or KT)

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Table A5-1. Template for TAF (continued)

Element as

specified in

Chapter 6

Detailed Con-

tent

Template(s)

Examples

Visibility (M)

Prevailing visibil-
ity (M)

nnnn

CAV-
OK

0350
7000
9000
9999

CAVOK

Weather (C)

Intensity of
weather phe-
nomena (C)

- or +

—

RA
+TSRA
-FZDZ
PRFG
+TSRASN
SNRA FG

HZ
FG

Characteristics
and type of
weather phe-
nomena (C)

DZ or RA or
SN or SG or
PL or DS or
SS or

FG or
BR or
SA or
DU or
HZ or
FU or
VA or
SQ or

FZDZ or
FZRA or

PO or
FC or
TS or

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Table A5-1. Template for TAF (continued)

Element as

specified in

Chapter 6

Detailed Con-

tent

Template(s)

Examples

SHGR or
SHGS or
SHRA or
SHSN or
TSGR or
TSGS or
TSRA or
TSSN

BCFG
or
BLDU
or
BLSA
or
BLSN
or
DRDU
or
DRSA
or
DRSN
or
FZFG
or
MIFG
or
PRFG

Cloud (M)

Cloud amount
and height of
base or vertical
visibility (M)

FEWnn
n or
SCTnn
n or
BKNnn
n or
OVCnn
n

VVnnn
or
VV///

NSC

FEW010

VV005

OVC020
NSC

VV///

SCT005 BKN012

Cloud type (C)

CB or
TCU

—

SCT008 BKN025CB

Temperature
(O)

Name of the ele-
ment (M)

TX25/1013Z TN09/1005Z
TX05/2112Z
TNM02/2103Z

Maximum tem-
perature (M)

[M]nn/

Day and time of
occurrence of
the maximum
temperature (M)

nnnnZ

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Table A5-1. Template for TAF (continued)

Element as

specified in

Chapter 6

Detailed Con-

tent

Template(s)

Examples

Name of the ele-
ment (M)

Minimum tem-
perature (M)

[M]nn/

Day and time of
occurrence of
the minimum
temperature (M)

nnnnZ

Expected sig-
nificant
changes to
one or more
of the above
elements dur-
ing the period
of validity
(C)

Change or prob-
ability indicator
(M)

PROB30 [TEMPO] or PROB40
[TEMPO] or BECMG or
TEMPO or FM

TEMPO 0815/0818
25017G25MPS
(TEMPO 0815/0818
25034G50KT)
TEMPO 2212/2214
17006G13MPS 1000
TSRA SCT010CB
BKN020
(TEMPO 2212/2214
17012G26KT 1000
TSRA SCT010CB
BKN020)
BECMG 3010/3011
00000MPS 2400 OVC010
(BECMG 3010/3011
00000KT 2400 OVC010)
PROB30 1412/1414 0800
FG
BECMG 1412/1414 RA
TEMPO 2503/2504 FZRA
TEMPO 0612/0615 BLSN
PROB40 TEMPO
2923/3001 0500 FG

Period of occur-
rence or change
(M)

nnnn/nnnn or nnnnnn

Wind (C)

nnn[P]nn[n][G[P]nn[n]]MPS
or
VRBnnMPS
(or
nnn[P]nn[G[P]nn]KT
or
VRBnnKT)

Prevailing visibil-
ity (C)

nnnn

CAV-
OK

Weather phe-
nomenon: inten-
sity (C)

- or +

—

NSW

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Table A5-1. Template for TAF (continued)

Element as

specified in

Chapter 6

Detailed Con-

tent

Template(s)

Examples

Cloud amount
and height of
base or vertical
visibility (C)

FEWnn
n or
SCTnn
n or
BKNnn
n or
OVCnn
n

VVnnn
or VV///

NSC

FM051230 15015KMH
9999 BKN020
(FM051230 15008KT
9999 BKN020)
BECMG 1618/1620 8000
NSW NSC
BECMG 2306/2308
SCT015CB BKN020

Cloud type (C)

CB or
TCU

—

Fictitious location.
To be used in accordance with 1.2.1.
To be included in accordance with 1.2.1.
To be included whenever applicable.
One or more, up to a maximum of three, groups in accordance with 1.2.3.
To be included whenever applicable in accordance with 1.2.3. No qualifier for moderate inten-
sity.
Weather phenomena to be included in accordance with 1.2.3.
Up to four cloud layers in accordance with 1.2.4.
To be included in accordance with 1.2.5, consisting of up to a maximum of four temperatures
(two maximum temperatures and two minimum temperatures).
To be included in accordance with 1.3, 1.4 and 1.5.
To be used with FM only.

Table A5-2. Use of Change and Time Indicators in TAF

Change or Time

Indicator

Time Peri-

Meaning

used to indicate a significant change in most weather ele-
ments occurring at n

day, n

hours and n

minutes

(UTC); all the elements given before "FM" are to be included
following “FM” (i.e. they are all superseded by those following
the abbreviation)

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Table A5-2. Use of Change and Time Indicators in TAF (continued)

Change or Time

Indicator

Time Peri-

Meaning

BECMG

the change is forecast to commence at n

day and n

hours (UTC) and be completed by n

day and n

hours (UTC); only those elements for which a change is fore-
cast are to be given following “BECMG”; the time period
n

should normally be less than 2

hours and in any case should not exceed 4 hours

TEMPO

temporary fluctuations are forecast to commence at n

day and n

hours (UTC) and cease by n

day and

hours (UTC); only those elements for which fluctua-

tions are forecast are to be given following “TEMPO”; tempo-
rary fluctuations should not last more than one hour in each
instance, and in the aggregate, cover less than half of the pe-
riod n

PROBnn —

probability of occurrence (in
%) of an alternative value of a
forecast element or elements;
nn = 30 or nn = 40 only; to be
placed after the element(s)
concerned

—

TEMPO

probability of occurrence of
temporary fluctuations

Table A5-4. Ranges and Resolutions for the Numerical Elements included in TAF

Element as specified in Chapter 6

Range

Resolution

Wind direction:

° true

000 - 360

Wind speed:

MPS

00 - 99

00 - 199

1
1

Visibility:

M
M
M
M

0000 - 0750
0800 - 4900
5000 - 9000

10000 –

100

1000

0 (fixed value: 9999)

Vertical visibility:

30's M

(100's FT)

000 - 020

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Table A5-4. Ranges and Resolutions for the Numerical Elements included in TAF (contin-

ued)

Element as specified in Chapter 6

Range

Resolution

Cloud: height of base:

30's M

(100's FT)

000 - 100

Air temperature (maximum and mini-
mum):

°C

-80 - +60

There is no aeronautical requirement to report surface wind speeds of 50m/s (100kt) or more;
however, provision has been made for reporting wind speeds up to 99m/s (199kt) for non-aero-
nautical purposes, as necessary.

Example A5-1. TAF

TAF for YUDO (Donlon/International)

TAF YUDO 160000Z 1606/1624 13005MPS 9000 BKN020 BECMG 1606/1608 SCT015CB
BKN020 TEMPO 1608/1612 17006G12MPS 1000 TSRA SCT010CB BKN020 FM161230
15004MPS 9999 BKN020
Meaning:

TAF for Donlon/International

issued on the 16th of the month at 0000 UTC valid from 0600 UTC

to 2400 UTC on the 16th of the month; surface wind direction 130 degrees; wind speed 5 meters
per second; visibility 9 kilometers, broken cloud at 600 meters; becoming between 0600 UTC
and 0800 UTC on the 16th of the month, scattered cumulonimbus cloud at 450 meters and bro-
ken cloud at 600 meters; temporarily between 0800 UTC and 1200 UTC on the 16th of the
month surface wind direction 170 degrees; wind speed 6 meters per second gusting to 12 me-
ters per second; visibility 1000 meters in a thunderstorm with moderate rain, scattered cumulo-
nimbus cloud at 300 meters and broken cloud at 600 meters; from 1230 UTC on the 16th of the
month surface wind direction 150 degrees; wind speed 4 meters per second; visibility 10 kilome-
ters or more; and broken cloud at 600 meters.
NOTE: In this example, the primary units "meter per second" and "meter" were used for wind
speed and height of cloud base, respectively. However, in accordance with Annex 5, the corre-
sponding non-SI alternative units "knot" and “foot" may be used instead.

Fictitious location.

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Appendix 6. Technical Specifications related to SIGMET and AIRMET

Information, Aerodrome Warnings and Wind Shear Warnings and

Alerts

(See Chapter 7 of this Annex.)
NOTE: Data type designators to be used in abbreviated headings for SIGMET, AIRMET tropical
cyclone and volcanic ash advisory messages are given in the Manual on the Global Telecommu-
nication System (WMO-No. 386).

Table A6-1A. Template for SIGMET and AIRMET Messages

Key:

inclusion mandatory, part of every message

inclusion conditional, included whenever applicable

a double line indicates that the text following it should be placed on the sub-
sequent line

NOTE 1: The ranges and resolutions for the numerical elements included in SIGMET/AIRMET
messages and in special air-reports are shown in Table A6-4 of this Appendix.
NOTE 2: Severe or moderate icing and severe or moderate turbulence (SEV ICE, MOD ICE, SEV
TURB, MOD TURB) associated with thunderstorms, cumulonimbus clouds or tropical cyclones
should not be included.

Table A6-1A. Template for SIGMET and AIRMET Messages

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

Location indi-
cator of
FIR/CTA (M)

ICAO loca-
tion indicator
of the ATS
unit serving
the FIR or
CTA to which
the SIGMET/
AIRMET re-
fers

nnnn

YUCC

YUDD

Identification
(M)

Message
identification
and se-
quence num-
ber

SIGMET [n]
[n]n

AIRMET [n][n]n SIGMET 1

SIGMET 01
SIGMET A01

AIRMET 9
AIRMET 19
AIRMET B19

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

Validity peri-
od (M)

Date-time
groups indi-
cating the
period of val-
idity in UTC

VALID nnnnnn/nnnnnn

VALID 010000/010400
VALID 221215/221600
VALID 101520/101800
VALID 251600/252200
VALID 152000/160000
VALID 192300/200300

Location indi-
cator of
MWO (M)

Location indi-
cator of
MWO origi-
nating the
message
with a sepa-
rating hy-
phen

nnnn–

YUDO–

YUSO–

Name of the
FIR/CTA (M)

Location indi-
cator and
name of the
FIR/CTA

for

which the
SIGMET/
AIRMET is
issued

nnnn
nnnnnnnnnn
FIR
or UIR
or FIR/UIR
or
nnnn
nnnnnnnnnn
CTA

nnnn
nnnnnnnnnn
FIR[/n]

YUCC AMS-
WELL FIR

YUDD SHAN-
LON

FIR/UIR

UIR
FIR/UIR
YUDD SHAN-
LON
CTA

YUCC AMS-
WELL FIR/2

YUDD SHAN-
LON FIR

IF THE SIGMET OR AIRMET MESSAGE IS TO BE CANCELLED, SEE DETAILS AT THE END
OF THE TEMPLATE
Status indica-
tor (C)

Indicator of
test or exer-
cise

TEST or EX-
ER

TEST or EXER TEST

EXER

TEST
EXER

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

EMBD

TS[GR

]

FRQ

TS[GR

]

SQL

TS[GR

]

TC
nnnnnnnnn
PSN
Nnn[nn] or
Snn[nn]
Wnnn[nn] or
Ennn[nn]
CB orTC
NN

PSN Nnn[nn]
or Snn[nn]
Wnnn[nn]
or Ennn[nn]
CB
SEV TURB

SEV ICE

SEV ICE
(FZRA)

SEV MTW

HVY DS

SFC VIS
nnnnM (nn)

ISOL

TS[GR]

OCNL

TS[GR

]

MT OBSC
BKN CLD
[n]nnn/[ABV]
[n]nnnM
(or BKN
CLD[n]nnn/
[ABV]
[n]nnnnFT)
or BKN CLD
SFC/[ABV]
[n]nnnM
(or BKN CLD
SFC/[ABV]
[n]nnnnFT)
OVC CLD
nnn/[ABV]
[n]nnnM
(or OVC CLD
[n]nnn/[ABV]
[n]nnnnFT)
or OVC CLD
SFC/[ABV]
[n]nnnM
(or OVC CLD
SFC/[ABV]
[n]nnnnFT)

EMBD TSGR
FRQ TS
FRQ TSGR
SQL TS
SQL TSGR
TC GLORIA
PSN N10
W060 CB
TC NN PSN
S2030
E06030 CB
SEV TURB
SEV ICE
SEV
ICE(FZRA)
SEV MTW

ISOL TS
ISOL TSGR
OCNL TS
OCNL TSGR
MT OBSC
BKN CLD
120/900M
BKN CLD
400/3000FT
BKN CLD
1000/5000ft
BKN CLD SFC/
3000M
BKN CLD SFC/
ABV10000FT
OVC CLD 270/
ABV3000M

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

HVY SS
[VA ERUP-
TION]
[MT
nnnnnnnnnn]
[PSN Nnn[nn]
or Snn[nn]
Ennn[nn] or
Wnnn[nn]]
VA CLD

ISOL

OCNL

FRQ

ISOL

TCU

OCNL

TCU

FRQ

TCU

HVY DS
HVY SS
VA ERUPTION
MT ASHVAL

PSN S15 E073
VA CLD
RDOACT CLD

OVC CLD 900/
ABV10000FT
OVC CLD
1000/5000ft
OVC CLD SFC/
3000M
OVC CLD SFC/
ABV10000FT
ISOL CB
OCNL CB
FRQ CB
ISOL TCU
OCNL TCU
FRQ TCU
MOD TURB
MOD ICE
MOD MTW

RDOACT
CLD

MOD TURB

MOD ICE

MOD MTW

Observed or
forecast phe-
nomenon (M)

Indication
whether the
information is
observed
and expec-
ted to contin-
ue, or fore-
cast

OBS [AT nnnnZ]
FCST [AT nnnnZ]

OBS
OBS AT 1210Z
FCST
FCST AT 1815Z

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

E OF Wnnn[nn] or E OF
Ennn[nn]
or
N OF LINE

or NE OF LINE

or E OF LINE

or SE OF

LINE

or S OF LINE

or SW OF

LINE

or W OF LINE

or NW OF LINE

Nnn[nn] or

Snn[nn] Wnnn[nn] or

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

Ennn[nn] - Nnn[nn] or Snn[nn]
Wnnn[nn] or Ennn[nn] [-
Nnn[nn] or Snn[nn] Wnnn[nn] or
Ennn[nn]] [- Nnn[nn]
or Snn[nn] Wnnn[nn] or
Ennn[nn]]
[AND N OF LINE

or NE OF LINE

or E OF LINE

or SE OF LINE

or S OF LINE

or SW OF LINE

or W OF LINE

or NW OF LINE

Nnn[nn] or Snn[nn] Wnnn[nn] or
Ennn[nn] - Nnn[nn] or Snn[nn]
Wnnn[nn] or Ennn[nn]
[- Nnn[nn] or Snn[nn] Wnnn[nn]
or Ennn[nnJ] [- Nnn[nn]
or Snn[nn] Wnnn[nn] or
Ennn[nn]]]
or
WI

21,22

Nnn[nn] or Snn[nn]

Wnnn[nn] or Ennn[nn]-
Nnn[nn] or Snn[nn] Wnnn[nn] or
Ennn[nn]-
Nnn[nn] or Snn[nn] Wnnn[nn] or
Ennn[nn]-
[Nnn[nn] or Snn[nn] Wnnn[nn]
or Ennn[nn]-
Nnn[nn] or Snn[nn] Wnnn[nn] or
Ennn[nn]]

N6050 E02630 - N6030 E02550
APRX 50KM WID LINE BTN N64
W017 - N60 W010 -
N57 E010
ENTIRE FIR
ENTIRE UIR
ENTIRE FIR/UIR
ENTIRE CTA
WI 400KM OF TC CENTER
WI 250KM OF TC CENTER
WI 30KM OF N6030 E02550 (ap-
plicable as of 7 November 2019)

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

or
APRX nnKM WID LlNE

BTN

(or nnNM WID LlNE

BTN)

Nnn[nn] or Snn[nn] Wnnn[nn] or
Ennn[nn]

[- Nnn[nn] or Snn[nn] Wnnn[nn]
or Ennn[nn]
[- Nnn[nn] or Snn[nn] Wnnn[nn]
or Ennn[nn]]
[- Nnn[nn] or Snn[nn] Wnnn[nn]
or Ennn[nn]]
or
ENTIRE UIR
or
ENTIRE FIR
or
ENTIRE FIR/UIR
or
ENTIRE CTA
or

WI nnnKM (or nnnNM) OF TC
CENTER
or

WI nnKM (or nnNM) OF
Nnn[nn] or Snn[nn] Wnnn[nn] or
Ennn[nn]

Level (C)

20,24

Flight level or
altitude

[SFC/]FLnnn or
[SFC/[nnnnM (or[SFC/]
[n]nnnnFT) or
FLnnn/nnn or
TOP FLnnn or

FL180
SFC/FL070
SFC/3000M
SFC/10000FT
FL050/080

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

Movements
or expected
movement
(C)

20,25

Movement or
expected
movement
(direction
and speed)
with refer-
ence to one
of the sixteen
points of
compass or
stationary

MOV N [nnKMH] or MOV NNE
[nnKMH] or MOV NE [nnKMH]
or MOV ENE [nnKMH] or MOV
E [nnKMH] or MOV ESE
[nnKMH] or MOV SE [nnKMH]
or MOV SSE [nnKMH] or MOV
S [nnKMH] or MOV SSW
[nnKMH] or MOV SW [nnKMH]
or MOV WSW [nnKMH] or
MOV W [nnKMH] or MOV
WNW [nnKMH] or MOV NW
[nnKMH] or MOV NNW
[nnKMH]
(or MOV N [nnKT] or MOV NNE
[nnKT] or MOV NE [nnKT] or
MOV ENE [nnKT] or MOV E
[nnKT] or MOV ESE [nnKT] or
MOV SE [nnKT] or MOV SSE
[nnKT] or MOV S [nnKT] or
MOV SSW [nnKT] or MOV SW
[nnKT] or MOV WSW [nnKT] or
MOV W [nnKT] or MOV WNW
[nnKT] or MOV NW [nnKT] or
MOV NNW [nnKT]) or STNR

MOV SE
MOV NNW
MOV E 40KMH
MOV E 20KT
MOV WSW 20KT
STNR

Changes in
intensity
(C)

Expected
changes in
intensity

INTSF or WKN or NC

INTSF
WKN
NC

Forecast time
(C)

Indication of
the forecast
time of phe-
nomenon

FCST AT
nnnnZ

—

FCST AT
2200Z

—

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

Forecast po-
sition (C)

20,

25,

Forecast po-
sition of phe-
nomenon at
the end of
the validity
period of the
SIGMET
message

Nnn[nn]
Wnnn[nn] or
Nnn[nn]
Ennn[nn] or
Snn[nn]
Wnnn[nn] or
Snn[nn]
Ennn[nn]
or
N OF Nnn[nn]
or
S OF Nnn[nn]
or
N OF Snn[nn]
or
S OF Snn[nn]
[AND]
W OF
Wnnn[nn] or
E OF
Wnnn[nn] or
W OF
Ennn[nn] or
E OF
Ennn[nn]
or
N OF Nnn[nn]
or
N OF Snn[nn]
AND S OF
Nnn[nn] or S
OF Snn[nn]

—

N30 W170
N OF N30
S OF S50 AND
W OF E170
S OF N46 AND
N OF N39
NE OF LINE
N35 W020 -
N45W040
SW OF LINE
N48 W020 -
N43 E010 AND
NE OF LINE
N43 W020 -
N38 E010
WI N20 W090 -
N05 W090 -
N10 W100 -
N20 W100 -
N20 W090
APRX 50KM
WID LINE
BTN N64
W017 -
N57 W005 -
N55 E010 -
N55 E030
ENTIRE FIR
ENTIRE UIR
ENTIRE
FIR/UIR
ENTIRE CTA

—

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

or
W OF
Wnnn[nn] or
W OF
Ennn[nn] AND
E OF
Wnnn[nn] or E
OF Ennn[nn]
or
N OF LlNE

or
NE OF LlNE

or
E OF LlNE

or
SE OF LlNE

or
S OF LlNE

or
SW OF
LlNE

W OF LlNE

or
NW OF
LlNE

Nnn[nn] or
Snn[nn]
Wnnn[nn] or
Ennn[nn] -
Nnn[nn] or
Snn[nn]
Wnnn[nn] or
Ennn[nn]

NO VA EXP
WI 30KM OF
N6030 E02550
(applicable as
of 7 November
2019)

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

[- Nnn[nn] or
Snn[nn]
Wnnn[nn] or
Ennn[nn]
[AND N OF
LlNE

or NE

OF LlNE

E OF LlNE

or SE OF
LlNE

or S

OF LlNE

SW OF
LlNE

or W

OF LlNE

NW OF
LlNE

Nnn[nn] or
Snn[nn]
Wnnn[nn] or
Ennn[nn] -
Nnn[nn] or
Snn[nn]
Wnnn[nn] or
Ennn[nn] [-
Nnn[nn] or
Snn[nn]
Wnnn[nn] or
Ennn[nn]]]

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Table A6-1A. Template for SIGMET and AIRMET Messages (continued)

Element

Detailed

Content

SIGMET tem-

plate

AIRMET tem-

plate

SPECIAL

message ex-

amples

AIRMET mes-

sage examples

or
ENTIRE FIR
or
ENTIRE UIR
or
ENTIRE
FIR/UIR
or
ENTIRE CTA
or

NO VA EXP
or

WI nnKM (or
nnNM) OF
Nnn[nn] or
Snn[nn]
Wnnn[nn] or
Ennn[nn]

Repetition of
elements
(C)

Repetition of
elements in-
cluded in a
SIGMET
message for
volcanic ash
cloud or trop-
ical cyclone

[AND]

—

AND

—

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JEPPESEN GENERAL AIRWAY MANUAL (Issue Date 1 JUL 21) - page 18