Code 4680
Submitted by uk.sci.weather on Mon, 21/01/2008 - 11:56am.
FM 12-IX Ext. SYNOP code form
In reports from fully automatic stations (THAT ARE EQUIPPED WITH THE APPROPRIATE SENSORS), a separate 'present weather' code table is used (wawa): After the station number group (IIiii), comes a group which contains information on whether or not 'weather' groups are included, and which code table is used. The important figure is the second figure in the group [ iRiXhVV ] as under:
| iX | Type of station | 7 ('weather')- group |
| 1 | Manned | Included |
| 2 | Manned | Not-included (no sig.Wx to report) |
| 3 | Manned | Not-included (data not available) |
| 4 | Automatic | Included using 'old' wwWW present weather coding |
| 5 | Automatic | Not-included (no sig. Wx to report) |
| 6 | Automatic | Not-included (data not available) |
| 7 | Automatic | Included using 'new' wawa Code table (as below) |
A scanned display of the the plotting convention for this code type will be found here.
| 01-09 | Description |
|---|---|
| 01 | Clouds generally dissolving or becoming less developed (during past hour) |
| 02 | State of sky generally unchanged |
| 03 | Clouds forming or developing (during past hour) |
| 04 | Haze, smoke or suspended dust (vis >=1.0km) |
| 05 | [as 04 but vis < 1.0km ] |
| 06 | - |
| 07 | - |
| 08 | - |
| 09 | - |
| 10-19 | Description |
|---|---|
| 10 | Mist |
| 11 | Diamond dust (not yet used) |
| 12 | Distant lightning (not yet used) |
| 13 | - |
| 14 | - |
| 15 | - |
| 16 | - |
| 17 | - |
| 18 | Squalls |
| 19 | - |
Code 20-26: used to report precipitation, fog (or ice fog) or thunderstorm at the station in the past hour, but not at time of observation. 27-29 appear to be current weather!
| 20-29 | Description |
|---|---|
| 20 | Fog |
| 21 | Precipitation |
| 22 | Drizzle (non-freezing) or snow grains |
| 23 | Rain (non-freezing) |
| 24 | Snow |
| 25 | Freezing drizzle or rain |
| 26 | Thunderstorm (with/without ppn) (not yet used) |
| 27 | Blowing/Drifting snow/sand (not yet used) |
| 28 | Blowing/Drifting snow/sand: vis >=1.0km (not yet used) |
| 29 | Blowing/Drifting snow/sand: vis < 1.0km (not yet used) |
| 30-39 | Description |
|---|---|
| 30 | Fog |
| 31 | Fog/Ice Fog in patches |
| 32 | Fog/Ice Fog - thinning in past hour |
| 33 | Fog/Ice Fog - no change |
| 34 | Fog/Ice Fog - set in, or thickened in past hour |
| 35 | Fog - depositing rime |
| 36 | - |
| 37 | - |
| 38 | - |
| 39 | - |
| 40-49 | Description |
|---|---|
| 40 | Precipitation (PPN) |
| 41 | PPN - slight/moderate |
| 42 | PPN - heavy |
| 43 | Liquid PPN - slight/moderate |
| 44 | Liquid PPN - heavy |
| 45 | Solid PPN - slight/moderate |
| 46 | Solid PPN - heavy |
| 47 | Freezing PPN - slight/moderate |
| 48 | Freezing PPN - heavy |
| 49 | - |
| 50-59 | Description |
|---|---|
| 50 | Drizzle |
| 51 | Drizzle, not freezing - slight |
| 52 | Drizzle, not freezing - moderate |
| 53 | Drizzle, not freezing - heavy |
| 54 | Drizzle, freezing - slight |
| 55 | Drizzle, freezing - moderate |
| 56 | Drizzle, freezing - heavy |
| 57 | Drizzle & rain mixed - slight |
| 58 | Drizzle & rain mixed - moderate/heavy |
| 59 | - |
| 60-69 | Description |
|---|---|
| 60 | Rain |
| 61 | Rain, not freezing - slight |
| 62 | Rain, not freezing - moderate |
| 63 | Rain, not freezing - heavy |
| 64 | Freezing rain - slight |
| 65 | Freezing rain - moderate |
| 66 | Freezing rain - heavy |
| 67 | Rain/drizzle & snow mixed - slight |
| 68 | Rain/drizzle & snow mixed - moderate/heavy |
| 69 | - |
| 70-79 | Description |
|---|---|
| 70 | Snow |
| 71 | Snow - slight |
| 72 | Snow - moderate |
| 73 | Snow - heavy |
| 74 | Ice Pellets - slight |
| 75 | Ice Pellets - moderate |
| 76 | Ice Pellets - heavy |
| 77 | Snow grains |
| 78 | Ice crystals |
| 79 | - |
| 80-89 | Description |
|---|---|
| 80 | Intermittent PPN |
| 81 | Intermittent rain - slight |
| 82 | Intermittent rain - moderate |
| 83 | Intermittent rain - heavy |
| 84 | Intermittent rain - violent |
| 85 | Intermittent snow - slight |
| 86 | Intermittent snow - moderate |
| 87 | Intermittent snow - heavy |
| 88 | - |
| 89 | Hail (not yet used) |
| 90-99 | Description |
|---|---|
| 90 | Thunderstorm (TS)(not yet used) |
| 91 | TS, slight/moderate - no PPN (not yet used) |
| 92 | TS, slight/moderate - rain/snow showers (not yet used) |
| 93 | TS, slight/moderate - hail (not yet used) |
| 94 | TS, heavy - no PPN (not yet used) |
| 95 | TS, heavy - rain/snow showers (not yet used) |
| 96 | TS, heavy - hail (not yet used) |
| 97 | - |
| 98 | - |
| 99 | Tornado !!! (not yet used) |
NB: This is not an official publicising of the WMO code form. It is purely intended for interested amateurs who want to be aware of the relevant code forms. If you have a professional requirement to use these codes, you should refer to the appropriate WMO publications for the official listing, or contact your national meteorological service for more details. I will not be responsible for any omissions, errors etc.
