| Number (In Section 4, octet 11) |
Parameter | Units |
Abbrev |
|---|---|---|---|
| 0 |
Visibility |
m |
VIS |
| 1 |
Albedo |
% |
ALBDO |
| 2 |
Thunderstorm Probability |
% |
TSTM |
| 3 |
Mixed Layer Depth |
m |
MIXHT |
| 4 |
Volcanic Ash |
See Table 4.206 | VOLASH |
| 5 |
Icing Top |
m |
ICIT |
| 6 |
Icing Base |
m |
ICIB |
| 7 |
Icing |
See Table 4.207 | ICI |
| 8 |
Turbulence Top |
m |
TURBT |
| 9 |
Turbulence Base |
m |
TURBB |
| 10 |
Turbulence | See Table 4.208 | TURB |
| 11 |
Turbulent Kinetic Energy |
J kg-1 |
TKE |
| 12 |
Planetary Boundary Layer Regime |
See Table 4.209 | PBLREG |
| 13 |
Contrail Intensity |
See Table 4.210 | CONTI |
| 14 |
Contrail Engine Type |
See Table 4.211 | CONTET |
| 15 |
Contrail Top |
m |
CONTT |
| 16 |
Contrail Base |
m |
CONTB |
| 17 |
Maximum Snow Albedo (see Note 1) | % | MXSALB |
| 18 |
Snow-Free Albedo | % | SNFALB |
| 19 | Snow Albedo |
% | SALBD |
| 20 | Icing | % | ICIP |
| 21 | In-Cloud Turbulence | % | CTP |
| 22 | Clear Air Turbulence (CAT) | % | CAT |
| 23 | Supercooled Large Droplet Probability (see Note 2) | % | SLDP |
| 24 |
Convective Turbulent Kinetic Energy | J kg-1 | CONTKE |
| 25 |
Weather | See Table 4.225 | WIWW |
| 26 |
Convective Outlook |
See Table 4.224 | CONVO |
| 27 |
Icing Scenario | See Table 4.227 | ICESC |
| 28 |
Mountain Wave Turbulence (Eddy Dissipation Rate) | m2/3 s-1 | MWTURB |
| 29 |
Clear Air Turbulence (CAT) (Eddy Dissipation Rate) | m2/3 s-1 | CATEDR |
| 30 |
Eddy Dissipation Parameter (See Note 3) | m2/3 s-1 | EDPARM |
| 31 |
Maximum of Eddy Dissipation Parameter in Layer | m2/3 s-1 | MXEDPRM |
| 32 | Highest Freezing Level | m | HIFREL |
| 33 | Visibility Through Liquid Fog | m | VISLFOG |
| 34 | Visibility Through Ice Fog | m | VISIFOG |
| 35 | Visibility Through Blowing Snow | m | VISBSN |
| 36 | Presence of Snow Squalls | See Table 4.222 | PSNOWS |
| 37 | Icing Severity | See Table 4.228 | ICESEV |
| 38 | Sky transparency index (see Note 4) | See Table 4.214 | SKYIDX |
| 39 | Seeing index (see Note 5) | See Table 4.214 | SEEINDEX |
| 40 | Snow level | m | SNOWLVL |
| 41 | Duct base height (see Note 6) | m | DBHEIGHT |
| 42 | Trapping layer base height (see Note 6) | m | TLBHEIGHT |
| 43 | Trapping layer top height (see Note 6) | m | TLTHEIGHT |
| 44 | Mean vertical gradient of refractivity inside trapping layer (see Note 6) | m-1 | MEANVGRTL |
| 45 | Minimum vertical gradient of refractivity inside trapping layer | m-1 | MINVGRTL |
| 46 | Net radiation flux | W m-2 | NETRADFLUX |
| 47 | Global irradiance on tilted surfaces | W m-2 | GLIRRTS |
| 48 | Top of persistent contrails | m | PCONTT |
| 49 | Base of persistent contrails | m | PCONTB |
| 50 | Convectively-induced turbulence (CIT) (eddy dissipation rate) | m2/3 s-1 | CITEDR |
| 51 | Visibility Through Precipitation | m | VISPCP |
| 52-191 |
Reserved | ||
| 192-254 |
Reserved for Local Use |
||
| 192 |
Maximum Snow Albedo | % | MXSALB |
| 193 |
Snow-Free Albedo | % | SNFALB |
| 194 |
Slight risk convective outlook | categorical | SRCONO |
| 195 |
Moderate risk convective outlook | categorical | MRCONO |
| 196 |
High risk convective outlook | categorical | HRCONO |
| 197 |
Tornado probability | % |
TORPROB |
| 198 |
Hail probability | % |
HAILPROB |
| 199 |
Wind probability | % |
WINDPROB |
| 200 |
Significant Tornado probability | % |
STORPROB |
| 201 |
Significant Hail probability | % |
SHAILPRO |
| 202 | Significant Wind probability | % | SWINDPRO |
| 203 |
Categorical Thunderstorm |
Code table 4.222 | TSTMC |
| 204 |
Number of mixed layers next to surface | integer | MIXLY |
| 205 | Flight Category |
FLGHT |
|
| 206 | Confidence - Ceiling |
CICEL |
|
| 207 | Confidence - Visibility |
CIVIS |
|
| 208 | Confidence - Flight Category |
CIFLT |
|
| 209 | Low-Level aviation interest |
LAVNI |
|
| 210 | High-Level aviation interest |
HAVNI |
|
| 211 | Visible, Black Sky Albedo |
% |
SBSALB |
| 212 | Visible, White Sky Albedo |
% |
SWSALB |
| 213 | Near IR, Black Sky Albedo |
% |
NBSALB |
| 214 | Near IR, White Sky Albedo |
% |
NWSALB |
| 215 | Total Probability of Severe Thunderstorms (Days 2,3) |
% |
PRSVR |
| 216 | Total Probability of Extreme Severe Thunderstorms (Days 2,3) | % |
PRSIGSVR |
| 217 | Supercooled Large Droplet (SLD) Icing (see Note 2) | See Table 4.207 |
SIPD |
| 218 |
Radiative emissivity |
EPSR |
|
| 219 |
Turbulence Potential Forecast Index | TPFI | |
| 220 |
Categorical Severe Thunderstorm |
Code table 4.222 | SVRTS |
| 221 |
Probability of Convection |
% |
PROCON |
| 222 |
Convection Potential |
Code table 4.222 | CONVP |
| 223-231 |
Reserved | ||
| 232 | Volcanic Ash Forecast Transport and Dispersion |
log10 (kg m-3) |
VAFTD |
| 233 |
Icing probability | non-dim | ICPRB |
| 234 |
Icing Severity | non-dim | ICSEV |
| 235 | Joint Fire Weather Probability | % | JFWPRB |
| 236 | Snow Level | m | SNOWLVL |
| 237 | Dry Thunderstorm Probability | % | DRYTPROB |
| 238 | Ellrod Index | ELLINX | |
| 239 | Craven-Wiedenfeld Aggregate Severe Parameter | Numeric | CWASP |
| 240 | Continuous Icing Severity | non-dim | ICESEVCON |
| 255 |
Missing |
| Notes:
(1) Parameter deprecated - See Regulation 92.6.2 and use another parameter instead. (2) Supercooled large droplets (SLD) are defined as those with a diameter greater than 50 microns. (3) Eddy Dissipation parameter is third root of eddy dissipation rate [m2 s-3] (4) In astronomy, sky transparency means the effect on the viewing experience caused by the scattering of light through atmospheric water vapour, aerosols or other constituents. Ideal transparency conditions produce a black night sky conducive to viewing faint astronomical objects, almost like being in outer space. In poor transparency conditions, which may occur even in cloud-free conditions, the deep sky background is greyish (not black), faint details are washed out and contrast is reduced. (5) Seeing means the steadiness or turbulence of the atmosphere in the context of astronomical observation. Turbulence causes rapid random fluctuations of the optical path through the atmosphere. The twinkling of stars, for example, occurs in poor seeing conditions. (6) A duct layer is an atmospheric layer with a refractivity which leads to a trapping of electromagnetic waves. In a trapping layer the refractivity leads to a bending of EM waves, which is stronger than the Earth's curvature. |