Regulation (EU) 2021/1338
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Template for SIGMET and AIRMET Key: M = inclusion mandatory; C = inclusion conditional, whenever applicable; and Note 1: The ranges and resolutions for the numerical elements included in SIGMET or AIRMET are shown in Appendix 8. Note 2: Severe or moderate icing (SEV ICE, MOD ICE) and severe or moderate turbulence (SEV TURB, MOD TURB) associated with thunderstorms, cumulonimbus clouds or tropical cyclones should not be included. Note 3: Row numbers in the ‘Ref.’ column are included only for clarity and ease of reference, and are not part of the SIGMET or AIRMET. |
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Ref. |
Element |
Detailed content |
SIGMET template |
AIRMET template |
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1 |
Location indicator of FIR/CTA (M) |
ICAO location indicator of the ATS unit serving the FIR or CTA to which the SIGMET/AIRMET refers |
nnnn |
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2 |
Identification (M) |
SIGMET or AIRMET identification and sequence number |
SIGMET nnn |
AIRMET [n][n]n |
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3 |
Validity period (M) |
Day-time groups indicating the period of validity in UTC |
VALID nnnnnn/nnnnnn |
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4 |
Location indicator of MWO (M) |
Location indicator of MWO originating the SIGMET or AIRMET with a separating hyphen |
nnnn– |
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5 |
New line |
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6 |
Name of the FIR/CTA (M) |
Location indicator 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] |
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7 |
IF THE SIGMET OR AIRMET IS TO BE CANCELLED, SEE DETAILS AT THE END OF THE TEMPLATE. |
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8 |
Status indicator (C) ([75]) |
Indicator of test or exercise |
TEST or EXER |
TEST or EXER |
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9 |
New line |
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10 |
Phenomenon (M) |
Description of the phenomenon causing the issuance of SIGMET/AIRMET |
OBSC TS[GR] EMBD TS[GR] FRQ TS[GR] SQL TS[GR] TC nnnnnnnnnn PSN Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] CB or TC NN ([76]) PSN Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] CB SEV TURB SEV ICE SEV ICE (FZRA) SEV MTW HVY DS HVY SS [VA ERUPTION] [MT nnnnnnnnnn] [PSN Nnn[nn] or Snn[nn] Ennn[nn] or Wnnn[nn]] VA CLD RDOACT CLD |
SFC WIND nnn/nn[n]KT SFC VIS [n][n]nnM (nn) ISOL TS[GR] OCNL TS[GR] MT OBSC BKN CLD BKN CLD [n]nnn/[ABV][n]nnnnFT or BKN CLD SFC/[ABV][n]nnnnFT or OVC CLD [n]nnn/[ABV][n]nnnnFT or OVC CLD SFC/[ABV][n]nnnnFT ISOL CB OCNL CB FRQ CB ISOL TCU OCNL TCU FRQ TCU MOD TURB MOD ICE MOD MTW |
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11 |
Indication whether the information is observed and expected to continue, or forecast |
OBS [AT nnnnZ] or FCST [AT nnnnZ] |
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12 |
Location (referring to latitude and longitude (in degrees and minutes)) |
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] or [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] or W OF Wnnn[nn] or W OF Ennn[nn] AND 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 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[nn]] [– Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn]]] or WI 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]]([82]) or ENTIRE UIR or ENTIRE FIR or ENTIRE FIR/UIR or ENTIRE CTA or WI nnnKM (or nnnNM) OF TC CENTRE ([83]) or WI nnKM (or nnNM) OF Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] ([84]) |
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13 |
Level (C) |
Flight level or altitude |
[SFC/]FLnnn or [SFC/][n]nnnnFT (or [SFC/]nnnnM) FLnnn/nnn or TOP FLnnn or [TOP] ABV FLnnn or (or [TOP] ABV [n]nnnnFT) [[n]nnnn/][n]nnnnFT) or [n]nnnnFT/]FLnnn or TOP [ABV or BLW] FLnnn ([85]) |
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14 |
Movement or expected movement (direction and speed) with reference to one of the 16 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 |
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15 |
Changes in intensity (C) ([89]) |
Expected changes in intensity |
INTSF or WKN or NC |
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16 |
Indication of the forecast time of the phenomenon |
FCST AT nnnnZ |
— |
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17 |
TC forecast position (C) ([93]) |
Forecast position of the TC centre |
TC CENTRE PSN Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] or TC CENTRE PSN Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] CB ([94]) |
— |
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18 |
Forecast position of the phenomenon at the end of the validity period of the SIGMET ([99]) |
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] or W OF Wnnn[nn] or W OF Ennn[nn] AND 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 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[nn]]] or WI 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] ([100]) or ENTIRE FIR or ENTIRE UIR or ENTIRE FIR/UIR or ENTIRE CTA or NO VA EXP ([101]) or WI nnKM (or nnNM) OF Nnn[nn] or Snn[nn] Wnnn[nn] or Ennn[nn] ([102]) or WI nnnKM (nnnNM) OF TC CENTRE ([103]) |
— |
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19 |
Repetition of elements (C) ([104]) |
Repetition of elements included in a SIGMET for volcanic ash cloud or tropical cyclone |
[AND] ([105]) |
— |
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20 |
New line if repeating elements |
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OR |
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21 |
Cancellation of SIGMET/AIRMET (C) |
Cancellation of SIGMET/AIRMET referring to its identification |
CNL SIGMET nnn nnnnnn/nnnnnn or CNL SIGMET nnn nnnnnn/nnnnnn [VA MOV TO nnnn FIR]([106]) |
CNL AIRMET [n][n]n nnnnnn/nnnnnn |
[75] Used only when SIGMET/AIRMET is issued to indicate that a test or an exercise is taking place. When the word ‘TEST’ or the abbreviation ‘EXER’ is included, the message may contain information that should not be used operationally or will otherwise end immediately after the word ‘TEST’.
[77] In the case of volcanic ash cloud covering more than one area within the FIR, these elements can be repeated, as necessary. Each location and forecast position are to be preceded by an observed or forecast time.
[78] In the case of cumulonimbus clouds associated with a tropical cyclone covering more than one area within the FIR, these elements can be repeated as necessary. Each location and forecast position must be preceded by an observed or forecast time.
[79] In the case of volcanic ash cloud covering more than one area within the FIR, these elements can be repeated, as necessary. Each location and forecast position are to be preceded by an observed or forecast time.
[80] In the case of cumulonimbus clouds associated with a tropical cyclone covering more than one area within the FIR, these elements can be repeated as necessary. Each location and forecast position must be preceded by an observed or forecast time.
[81] For SIGMET for radioactive cloud, only within (WI) is to be used for theelements ‘location’ and ‘forecast position’.
[82] The number of coordinates are to be kept to a minimum and should not normally exceed seven.
[83] Only for SIGMET for tropical cyclones.
[84] Only for SIGMET for radioactive cloud. A radius of up to 30 kilometres (or 16 nautical miles) from the source and a vertical extent from surface (SFC) to the upper limit of the flight information region/upper flight information region (FIR/UIR) or control area (CTA) is to be applied.
[85] Only for SIGMET for tropical cyclones.
[86] In the case of volcanic ash cloud covering more than one area within the FIR, these elements can be repeated, as necessary. Each location and forecast position are to be preceded by an observed or forecast time.
[87] The elements ‘forecast time’ and ‘forecast position’ are not to be used in conjunction with the element ‘movement or expected movement’.
[88] For SIGMET for radioactive cloud, only stationary (STNR) is to be used for the element ‘movement or expected movement’.
[89] In the case of volcanic ash cloud covering more than one area within the FIR, these elements can be repeated, as necessary. Each location and forecast position are to be preceded by an observed or forecast time.
[90] In the case of volcanic ash cloud covering more than one area within the FIR, these elements can be repeated, as necessary. Each location and forecast position are to be preceded by an observed or forecast time.
[91] In the case of cumulonimbus clouds associated with a tropical cyclone covering more than one area within the FIR, these elements can be repeated as necessary. Each location and forecast position must be preceded by an observed or forecast time.
[92] The elements ‘forecast time’ and ‘forecast position’ are not to be used in conjunction with the element ‘movement or expected movement’.
[93] Only for SIGMET for tropical cyclones.
[94] The term ‘CB’ is to be used when the forecast position for the cumulonimbus cloud is included.
[95] In the case of volcanic ash cloud covering more than one area within the FIR, these elements can be repeated, as necessary. Each location and forecast position are to be preceded by an observed or forecast time.
[96] In the case of cumulonimbus clouds associated with a tropical cyclone covering more than one area within the FIR, these elements can be repeated as necessary. Each location and forecast position must be preceded by an observed or forecast time.
[97] For SIGMET for radioactive cloud, only within (WI) is to be used for theelements ‘location’ and ‘forecast position’.
[98] The elements ‘forecast time’ and ‘forecast position’ are not to be used in conjunction with the element ‘movement or expected movement’.
[100] The number of coordinates are to be kept to a minimum and should not normally exceed seven.
[101] Only for SIGMET for volcanic ash.
[102] Only for SIGMET for radioactive cloud. A radius of up to 30 kilometres (or 16 nautical miles) from the source and a vertical extent from surface (SFC) to the upper limit of the flight information region/upper flight information region (FIR/UIR) or control area (CTA) is to be applied.
[103] Only for SIGMET for tropical cyclones.
[104] To be used for more than one volcanic ash clouds or cumulonimbus clouds associated with a tropical cyclone simultaneously affecting the FIR concerned.’
[106] Only for SIGMET for volcanic ash.
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