New categories for Hazard indices in discipline 20 [Code Table 4.1 and 4.2 and new Code table 4.253]

[sebvi]

Initial request

Following the discussion in issue #254 , we would like to propose 2 new categories in Code Table 4.2 discipline 20: "Meteorological and hydrological hazard indices" and "Environmental hazard indices".

The indices in these 2 categories utilize an auxiliary Code Table 4.253. This table is left empty and managed by each centre as we felt it difficult to propose a unique coding of the impact and the severity of the hazards. Our original proposal in #254 contains an example of such table.

Amendment details

ADD new Categories in Code Table 4.1 discipline 20

number	Description
4	Meteorological and hydrological hazard indices
5	Environmental hazard indices

ADD new entries in Code table 4.2 discipline 20 category 4

Parameter number	name	Unit
0	Reserved	-
1	Downburst	[Code table 4.253]
2	Lightning (Electrical Storm)	[Code table 4.253]
3	Thunderstorm	[Code table 4.253]
4	Coastal Flood	[Code table 4.253]
5	Estuarine (Coastal) Flood	[Code table 4.253]
6	Flash Flood	[Code table 4.253]
7	Fluvial (Riverine) Flood	[Code table 4.253]
8	Groundwater Flood	[Code table 4.253]
9	Ice-Jam Flood Including Debris	[Code table 4.253]
10	Ponding (Drainage) Flood	[Code table 4.253]
11	Snowmelt Flood	[Code table 4.253]
12	Surface Water Flooding	[Code table 4.253]
13	Glacial Lake Outburst Flood	[Code table 4.253]
14	Black Carbon (Brown Clouds)	[Code table 4.253]
15	Dust storm or Sandstorm	[Code table 4.253]
16	Fog	[Code table 4.253]
17	Haze	[Code table 4.253]
18	Polluted Air	[Code table 4.253]
19	Sand haze	[Code table 4.253]
20	Smoke	[Code table 4.253]
21	Ocean Acidification	[Code table 4.253]
22	Rogue Wave	[Code table 4.253]
23	Sea Water Intrusion	[Code table 4.253]
24	Sea Ice (Ice Bergs)	[Code table 4.253]
25	Ice Flow	[Code table 4.253]
26	Seiche	[Code table 4.253]
27	Storm Surge	[Code table 4.253]
28	Storm Tides	[Code table 4.253]
29	Tsunami	[Code table 4.253]
30	Depression or Cyclone (Low Pressure Area) (Pressure-Related)	[Code table 4.253]
31	Extra-tropical Cyclone (Pressure-Related)	[Code table 4.253]
32	Sub-Tropical Cyclone (Pressure-Related)	[Code table 4.253]
33	Acid Rain	[Code table 4.253]
34	Blizzard	[Code table 4.253]
35	Drought	[Code table 4.253]
36	Hail	[Code table 4.253]
37	Ice Storm	[Code table 4.253]
38	Snow	[Code table 4.253]
39	Snow Storm	[Code table 4.253]
40	Cold Wave	[Code table 4.253]
41	Dzud	[Code table 4.253]
42	Freeze	[Code table 4.253]
43	Frost (Hoar Frost)	[Code table 4.253]
44	Freezing Rain (Supercooled Rain)	[Code table 4.253]
45	Glaze	[Code table 4.253]
46	Ground Frost	[Code table 4.253]
47	Heatwave	[Code table 4.253]
48	Icing (Including Ice)	[Code table 4.253]
49	Thaw	[Code table 4.253]
50	Avalanche	[Code table 4.253]
51	Mud Flow	[Code table 4.253]
52	Rock slide	[Code table 4.253]
53	Derecho	[Code table 4.253]
54	Gale (Strong Gale)	[Code table 4.253]
55	Squall	[Code table 4.253]
56	Subtropical Storm	[Code table 4.253]
57	Tropical Cyclone (Cyclonic Wind, Rain [Storm] Surge) (Wind-Related)	[Code table 4.253]
58	Tropical Storm (Wind-Related)	[Code table 4.253]
59	Tornado	[Code table 4.253]
60	Wind	[Code table 4.253]
191 - 254	Reserved for local use	-
255	Missing	-

ADD new entries in Code table 4.2 discipline 20 category 5

Parameter number	name	Unit
0	Reserved	-
1	Household Air Pollution	[Code table 4.253]
2	Air Pollution (Point Source)	[Code table 4.253]
3	Ambient (Outdoor) Air Pollution	[Code table 4.253]
4	Land Degradation	[Code table 4.253]
5	Soil Degradation	[Code table 4.253]
6	Runoff / Nonpoint Source Pollution	[Code table 4.253]
7	Salinity	[Code table 4.253]
8	Biodiversity Loss	[Code table 4.253]
9	Deforestation	[Code table 4.253]
10	Forest Declines and Diebacks	[Code table 4.253]
11	Forest Disturbances	[Code table 4.253]
12	Forest Invasive Species	[Code table 4.253]
13	Wildfires	[Code table 4.253]
14	Desertification	[Code table 4.253]
15	Loss of Mangroves	[Code table 4.253]
16	Wetland Loss/Degradation	[Code table 4.253]
17	Coral Bleaching	[Code table 4.253]
18	Compressive Soils	[Code table 4.253]
19	Soil Erosion	[Code table 4.253]
20	Coastal Erosion and Shoreline Change	[Code table 4.253]
21	Permafrost Loss	[Code table 4.253]
22	Sand Mining	[Code table 4.253]
23	Sea Level Rise	[Code table 4.253]
24	Eutrophication	[Code table 4.253]
191 - 254	Reserved for local use	-
255	Missing	-

ADD new Code table 4.253 Hazard Index

Code	Description
0	Undefined
1-191	Reserved (see Note)
192-254	Reserved for local use
255	Missing

Note: The hazard index can be locally defined by the centre

Comments

No response

Requestor(s)

Sebastien Villaume (ECMWF)
Matthew Griffith (ECMWF)

Stakeholder(s)

ECMWF, Destination Earth service

Publication(s)

Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 20, category 4 (create)
Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.2, discipline 20, category 5 (create)
Manual on Codes (WMO-No. 306), Volume I.2, GRIB code table 4.253 (create)

Expected impact of change

None

Collaborators

No response

References

UN Office for disaster risk reduction which classifies the various type of hazards: UNDRR document

Validation

No response

[amilan17]

https://github.com/wmo-im/tt-tdcf/wiki/2024.11.13.tt.tdcf notes:

• Sebastien introduced yesterday, but notes were lost
• from UNDRR publication
• @sebvi update table 4.253 -- no need to have missing, reserved, etc.
• Sibylle suggested cross referencing/mapping (?) ; Sebastien expressed concerned with linking/mapping due to long term maintenance;
• Sibylle recommends creating a hazard index table instead ; Sebastien notes that this will require 4 new templates
• Sebastien, it's possible, but needs to consult with colleagues

[sebvi]

Please find attached some sample files and a version of ecCodes capable of encode/decode the new proposed templates.
eccodes-2.40.0-Source.tar.gz
FT2025-1_285.tar.gz

[amilan17]

https://github.com/wmo-im/et-data/wiki/2024.12.03.et.data notes:
no additional encoding/decoding testing needed because they are just additional parameters
@sebvi branch is ready for updating