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Created by
Matthew Griffith, last updated on Mar 11, 2026
4 minute read
This is a first draft portfolio provided ahead of the release of Phase 2 data - which is expected for Q3 2026 - and so is subject to change.
The Extremes DT data catalogue will be updated as the data is released.
Parameters forming part of the Extremes Digital Twin (DT) for Phase 2 are detailed here.
Additional keys
Please note that additional keys are often necessary in addition to the base parameter definition below. For example for:
- statistical processing (e.g. time interval of processing)
- level information (e.g. a given pressure level, say 300 hPa)
Legend:
| Parameter ready and no change from encoding in Phase 1 |
| Parameter ready but changes for encoding in Phase 2 |
Contents:
1. Instantaneous encodings
1.1. Fields on a single level or surface
1.1.1. Atmosphere (levtype sfc)
Time resolution: Hourly (step=0/1/2/.../96).
|
param Id |
name |
short Name |
units |
discipline |
parameter Category |
parameter Number |
type Of Level |
level |
type Of Statistical Processing |
comments |
|---|---|---|---|---|---|---|---|---|---|---|
|
31 |
ci |
(0 - 1) |
10 |
2 |
0 |
surface |
- |
|
GG | |
|
34 |
sst |
K |
10 |
3 |
0 |
surface | - |
|
GG | |
|
78 |
tclw |
kg m**-2 |
0 |
1 |
69 |
entireAtmosphere |
- |
|
GG | |
|
134 |
sp |
Pa |
0 |
3 |
0 |
surface |
- |
|
GG | |
|
136 |
tcw |
kg m**-2 |
0 |
1 |
51 |
entireAtmosphere |
- |
|
GG | |
|
137 |
tcwv |
kg m**-2 |
0 |
1 |
64 |
entireAtmosphere |
- |
|
GG | |
|
151 |
msl |
Pa |
0 |
3 |
0 |
meanSea |
- |
|
GG | |
|
165 |
10u |
m s**-1 |
0 |
2 |
2 |
heightAboveGround |
10 |
|
GG | |
|
166 |
10v |
m s**-1 |
0 |
2 |
3 |
heightAboveGround |
10 |
|
GG | |
|
167 |
2t |
K |
0 |
0 |
0 |
heightAboveGround |
2 |
|
GG | |
|
168 |
2d |
K |
0 |
0 |
6 |
heightAboveGround |
2 |
|
GG | |
|
235 |
skt |
K |
0 |
0 |
17 |
surface |
- |
|
GG | |
|
3020 |
vis |
m |
0 |
19 |
0 |
heightAboveGround |
10 |
|
GG | |
|
228029 |
i10fg |
m s**-1 |
0 |
2 |
22 |
heightAboveGround |
10 |
|
GG | |
|
228050 |
litoti |
km**-2 day**-1 |
0 |
17 |
4 |
entireAtmosphere |
- |
|
GG. | |
|
228218 |
crr |
kg m**-2 s**-1 |
0 |
1 |
76 |
surface |
- |
|
GG | |
|
228219 |
lsrr |
kg m**-2 s**-1 |
0 |
1 |
77 |
surface |
- |
|
GG | |
|
228221 |
lssfr |
kg m**-2 s**-1 |
0 |
1 |
56 |
surface |
- |
|
GG. |
|
|
228235 |
mucape |
J kg**-1 |
0 |
7 |
6 |
mostUnstableParcel |
- |
|
GG. Used rather than 59; cape, which is phased out. |
|
|
260015 |
ptype |
code table (4.201) |
0 |
1 |
19 |
surface |
- |
|
GG |
1.1.2. Wave (levtype sfc)
Time resolution: Hourly (step=0/1/2/.../96).
|
param Id |
name |
short Name |
units |
discipline |
parameter Category |
parameter Number |
type Of Level |
level |
type Of Statistical Processing |
comments |
|---|---|---|---|---|---|---|---|---|---|---|
|
140221 |
mp2 |
s |
10 |
0 |
28 |
surface |
- |
|
GG | |
|
140229 |
swh |
m |
10 |
0 |
3 |
surface |
- |
|
GG | |
|
140230 |
mwd |
degrees |
10 |
0 |
14 |
surface |
- |
|
GG | |
|
140231 |
pp1d |
s |
10 |
0 |
34 |
surface |
- |
|
GG | |
|
140232 |
mwp |
s |
10 |
0 |
15 |
surface |
- |
|
GG |
1.2. Fields on pressure levels (levtype pl)
Time resolution: Hourly (step=0/1/2/.../96).
21 pressure levels: (1, 2, 3, 5, 7, 10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 500, 700, 850, 925, 1000)
|
param Id |
name |
short Name |
units |
discipline |
parameter Category |
parameter Number |
type Of Level |
level |
type Of Statistical Processing |
comments |
|---|---|---|---|---|---|---|---|---|---|---|
| 129 | Geopotential | z | m**2 s**-2 | 0 | 3 | 4 | isobaricInhPa | <as-above> | GG. At surface this is orography. | |
|
130 |
t |
K |
0 |
0 |
0 |
isobaricInhPa |
<as-above> |
|
GG |
|
|
131 |
u |
m s**-1 |
0 |
2 |
2 |
isobaricInhPa |
<as-above> |
|
GG |
|
|
132 |
v |
m s**-1 |
0 |
2 |
3 |
isobaricInhPa |
<as-above> |
|
GG |
|
|
133 |
q |
kg kg**-1 |
0 |
1 |
0 |
isobaricInhPa |
<as-above> |
|
GG |
|
|
157 |
r |
% |
0 |
1 |
1 |
isobaricInhPa |
<as-above> |
|
GG |
1.3. Fields on height levels (levtype hl)
Time resolution: Hourly (step=0/1/2/.../96).
Currently 100m only. These are only for height levels >10m to preserve backwards compatibility with longstanding model fields (2t, 10u, 10v,...)
|
param Id |
name |
short Name |
units |
discipline |
parameter Category |
parameter Number |
type Of Level |
level |
type Of Statistical Processing |
comments |
|---|---|---|---|---|---|---|---|---|---|---|
|
131 |
u |
m s**-1 |
0 |
2 |
2 |
heightAboveGround |
100 |
|
GG | |
|
132 |
v |
m s**-1 |
0 |
2 |
3 |
heightAboveGround |
100 |
|
GG |
2. Mean encodings
2.1. Fields on a single level or surface
2.1.1. Atmosphere (levtype sfc)
Time resolution: 6 hourly means (step=0-6/6-12/.../90-96).
|
param Id |
name |
short Name |
units |
discipline |
parameter Category |
parameter Number |
type Of Level |
level |
type Of Statistical Processing |
comments |
|---|---|---|---|---|---|---|---|---|---|---|
|
235326 |
avg_litoti |
km**-2 day**-1 |
0 |
17 |
4 |
entireAtmosphere |
- |
0 |
GG. |
3. Accumulated encodings
3.1. Fields on a single level or surface
3.1.1. Atmosphere (levtype sfc)
Time resolution: Hourly accumulations since the start of the forecast (step=0-1/1-2/2-3/.../95-96).
|
param Id |
name |
short Name |
units |
discipline |
parameter Category |
parameter Number |
type Of Level |
level |
type Of Statistical Processing |
comments |
|---|---|---|---|---|---|---|---|---|---|---|
|
3062 |
lsp |
kg m**-2 |
0 |
1 |
54 |
surface |
- |
1 |
GG. 142 → 3062 |
|
|
228144 |
sf |
kg m**-2 |
0 |
1 |
53 |
surface |
- |
1 |
GG. |
|
|
169 |
ssrd |
J m**-2 |
0 |
4 |
7 |
surface |
- |
1 |
GG | |
|
175 |
strd |
J m**-2 |
0 |
5 |
3 |
surface |
- |
1 |
GG | |
|
176 |
ssr |
J m**-2 |
0 |
4 |
9 |
surface |
- |
1 |
GG | |
|
177 |
str |
J m**-2 |
0 |
5 |
5 |
surface |
- |
1 |
GG | |
|
178 |
tsr |
J m**-2 |
0 |
4 |
9 |
nominalTop |
- |
1 |
GG | |
|
179 |
ttr |
J m**-2 |
0 |
5 |
5 |
nominalTop |
- |
1 |
GG | |
|
180 |
ewss |
N m**-2 s |
0 |
2 |
62 |
surface |
- |
1 |
GG. | |
|
181 |
nsss |
N m**-2 s |
0 |
2 |
63 |
surface |
- |
1 |
GG. | |
|
231002 |
rowe |
kg m**-2 |
2 |
0 |
42 |
surface |
- |
1 |
GG. 205 → 231002 |
|
|
228228 |
tp |
kg m**-2 |
0 |
1 |
52 |
surface |
- |
1 |
GG. 228 → 228228 |
|
|
231001 |
fzrawe |
kg m**-2 |
0 |
1 |
67 |
surface |
- |
1 |
GG. 228216 → 231001 |