GRIB2 - TABLE 4.2-0-19

PARAMETERS FOR DISCIPLINE 0
CATEGORY 19

(Meteorological products, Physical Atmospheric category)

In Section 0, Octet 7 = 0
In Section 4, Octet 10 = 19

Revised 12/07/2023
Red text depicts changes made since 01/19/2022



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
51-191
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.


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