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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