GRIB2 - TABLE 4.2-0-2

PARAMETERS FOR DISCIPLINE 0
CATEGORY 2

(Meteorological products, Momentum category)

In Section 0, Octet 7 = 0
In Section 4, Octet 10 = 2

Revised 06/09/2026
Red text depicts changes made since 09/11/2025


Number
(In Section 4, octet 11)
 Parameter Units
 Abbrev
0
 Wind Direction (from which blowing)
 ° WDIR
1
 Wind Speed
 m s-1
 WIND
2
 U-Component of Wind
 m s-1 UGRD
3
 V-Component of Wind m s-1 VGRD
4
 Stream Function
 m2 s-1 STRM
5
 Velocity Potential
 m2 s-1 VPOT
6
 Montgomery Stream Function m2 s-2 MNTSF
7
 σ Coordinate Vertical Velocity
 s-1 SGCVV
8
 Vertical Velocity (Pressure)
 Pa s-1 VVEL
9
 Vertical Velocity (Geometric) m s-1 DZDT
10
 Absolute Vorticity
 s-1 ABSV
11
 Absolute Divergence
 s-1 ABSD
12
 Relative Vorticity
 s-1 RELV
13
 Relative Divergence
 s-1 RELD
14
 Potential Vorticity
 K m2 kg-1 s-1 PVORT
15
 Vertical U-Component Shear
 s-1 VUCSH
16
 Vertical V-Component Shear
 s-1 VVCSH
17
 Momentum Flux, U-Component N m-2 UFLX
18
 Momentum Flux, V-Component N m-2 VFLX
19
 Wind Mixing Energy
 J
 WMIXE
20
 Boundary Layer Dissipation
 W m-2 BLYDP
21
 Maximum Wind Speed (see Note 1) m s-1 MAXGUST
22
 Wind Speed (Gust)
 m s-1 GUST
23
 U-Component of Wind (Gust) m s-1 UGUST
24
 V-Component of Wind (Gust) m s-1 VGUST
25
 Vertical Speed Shear s-1 VWSH
26
 Horizontal Momentum Flux N m-2 MFLX
27
 U-Component Storm Motion m s-1 USTM
28
 V-Component Storm Motion m s-1 VSTM
29
 Drag Coefficient Numeric CD
30
 Frictional Velocity m s-1 FRICV
31
 Turbulent Diffusion Coefficient for Momentum m2 s-1 TDCMOM
32
 η Coordinate Vertical Velocity s-1 ETACVV
33
 Wind Fetch m WINDF
34
 Normal Wind Component (see Note 2) m s-1 NWIND
35
 Tangential Wind Component (see Note 2) m s-1 TWIND
36
 Amplitude Function for Rossby Wave Envelope for Meridional Wind (see Note 3) m s-1 AFRWE
37
 Northward Turbulent Surface Stress (see Notes 4 and 7) N m-2 s NTSS
38
 Eastward Turbulent Surface Stress (see Notes 4 and 7) N m-2 s ETSS
39 Eastward Wind Tendency Due to Parameterizations m s-2 EWTPARM
40 Northward Wind Tendency Due to Parameterizations m s-2 NWTPARM
41 U-Component of Geostrophic Wind m s-1 UGWIND
42 V-Component of Geostrophic Wind m s-1 VGWIND
43 Geostrophic Wind Direction ° GEOWD
44 Geostrophic Wind Speed m s-1 GEOWS
45 Unbalanced Component of Divergence s-1 UNDIV
46 Vorticity Advection s-2 VORTADV
47 Surface roughness for heat (see Note 5) m SFRHEAT
48 Surface roughness for moisture (see Note 6) m SFRMOIST
49 Wind stress N m-2 WINDSTR
50 Eastward wind stress N m-2 EWINDSTR
51 Northward wind stress N m-2 NWINDSTR
52 U-component of wind stress N m-2 UWINDSTR
53 V-component of wind stress N m-2 VWINDSTR
54 Natural logarithm of surface roughness length for heat m NLSRLH
55 Natural logarithm of surface roughness length for moisture m NLSRLM
56 U-component of neutral wind m s-1 UNWIND
57 V-component of neutral wind m s-1 VNWIND
58 Magnitude of turbulent surface stress N m-2 TSFCSTR
59 Vertical divergence s-1 VDIV
60 Drag thermal coefficient Numeric DTC
61 Drag evaporation coefficient Numeric DEC
62 Eastward turbulent surface stress N m-2 EASTTSS
63 Northward turbulent surface stress N m-2 NRTHTSS
64 Eastward turbulent surface stress due to orographic form drag N m-2 EASTTSSOD
65 Northward turbulent surface stress due to orographic form drag N m-2 NRTHTSSOD
66 Eastward turbulent surface stress due to surface roughness N m-2 EASTTSSSR
67 Northward turbulent surface stress due to surface roughness N m-2 NRTHTSSSR
68 Convective Gust m s-1 CNVGUST
69 Turbulent Gust m s-1 TURBGUST
70 Wind Speed Threshold for Wind Erosion (see Note 8) m s-1 WINDERO
71-191
 Reserved

192-254
 Reserved for Local Use

192
 Vertical Speed Shear s-1 VWSH
193
 Horizontal Momentum Flux N m-2 MFLX
194
 U-Component Storm Motion m s-1 USTM
195
 V-Component Storm Motion m s-1 VSTM
196
 Drag Coefficient non-dim CD
197
 Frictional Velocity m s-1 FRICV
198
 Latitude of U Wind Component of Velocity deg LAUV
199
 Longitude of U Wind Component of Velocity deg LOUV
200
 Latitude of V Wind Component of Velocity deg LAVV
201
 Longitude of V Wind Component of Velocity deg LOVV
202
 Latitude of Presure Point deg LAPP
203
 Longitude of Presure Point deg LOPP
204
 Vertical Eddy Diffusivity Heat Exchange m2 s-1 VEDH
205
 Covariance between Meridional and Zonal Components of the Wind m2 s-2 COVMZ
206
 Covariance between Temperature and Zonal Components of the Wind K*m s-1 COVTZ
207
 Covariance between Temperature and Meridional Components of the Wind K*m s-1 COVTM
208
 Vertical Diffusion Zonal Acceleration
 m s-2 VDFUA
209
 Vertical Diffusion Meridional Acceleration
 m s-2 VDFVA
210
 Gravity wave drag zonal acceleration
 m s-2
 GWDU
211
 Gravity wave drag meridional acceleration
 m s-2
 GWDV
212
 Convective zonal momentum mixing acceleration
 m s-2
 CNVU
213
 Convective meridional momentum mixing acceleration
 m s-2
 CNVV
214
 Tendency of vertical velocity m s-2
 WTEND
215
 ω (Dp/Dt) divided by density K
 OMGALF
216
 Convective Gravity wave drag zonal acceleration
 m s-2
 CNGWDU
217
 Convective Gravity wave drag meridional acceleration
 m s-2
 CNGWDV
218
 Velocity Point Model Surface
LMV
219
 Potential Vorticity (Mass-Weighted) 1/s/m PVMWW
220
 Hourly Maximum of Upward Vertical Velocity m s-1
 MAXUVV
221
 Hourly Maximum of Downward Vertical Velocity m s-1
 MAXDVV
222
 U Component of Hourly Maximum 10m Wind Speed m s-1
 MAXUW
223
 V Component of Hourly Maximum 10m Wind Speed m s-1
 MAXVW
224
 Ventilation Rate m2 s-1
 VRATE
225 Transport Wind Speed m s-1 TRWSPD
226 Transport Wind Direction Deg TRWDIR
227 Earliest Reasonable Arrival Time (10% exceedance) s TOA10
228 Most Likely Arrival Time (50% exceedance) s TOA50
229 Most Likely Departure Time (50% exceedance) s TOD50
230 Latest Reasonable Departure Time (90% exceedance) s TOD90
231 Tropical Wind Direction ° TPWDIR
232 Tropical Wind Speed m s-1 TPWSPD
233 Effective Layer Bulk Shear Magnitude (Inflow Base to 50% of EL) kt ESHR
234 U Component Effective Layer Bulk Shear (Inflow Base to 50% of EL) kt UESH
235 V Component Effective Layer Bulk Shear (Inflow Base to 50% of EL) kt VESH
236 U Component Bunkers Effective Right Motion kt UEID
237 V Component Bunkers Effective Right Motion kt VEID
255
 Missing



Notes:

(1)  Parameter deprecated - See Regulation 92.6.2 and use another parameter instead.

(2)  In relation to local coordinate axes at a cell edge.

(3)  This parameter is described in more detail by (a) Lee, S. and I.M. Held, 1993: Baroclinic wave packets in models and observations. J. Atmos. Sci., 50:1413-1428, (b) Chang, E.K.M., 1993: Downstream development of baroclinic waves as inferred from regression analysis. J. Atmos. Sci., 50:2038-2053, (c) Archambault, H.M., D. Keyser and L.F. Bosart, 2010: Relationships between large-scale regime transitions and major cool-season precipitation events in the northeastern United States. Mon Wea. Review, 138:3454-3473, and(d) Zimin, A.V., I. Szunyogh, B.R. Hung and E. Orr, 2006: Extracting envelopes of non-zonally propagating Rossby wave packets. Mon. Wea. Review, 134:1329-1333.

(4)  Statistical process 1 (Accumulation) does not change units.

(5)  Surface roughness for heat is a measure of the surface resistance to heat transfer.

(6)  Surface roughness for moisture is a measure of the surface resistance to moisture transfer.

(7)  Parameters 37 and 38 are deprecated. It is recommended to use 63 and 64 instead.

(8)  The wind speed threshold for wind erosion is the minimum sustained wind speed at which soil particles begin to be lifted and transported by the air. This threshold is not a single, universal number; rather, it is highly variable and dependent on local environmental factors.


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