RMI Documentation for dataset 'Synoptic observations'
Parameters
Precipitation
PRECIP_QUANTITY = amount of precipitation in mm.
PRECIP_RANGE = period over which PRECIP_QUANTITY was measured.
- 1 = past 6h
- 2 = past 12h
- 4 = past 24h
Value at 0600UT: sum of precipitation between 1750-0550UT
Value at 1200UT: sum of precipitation between 0550-1150UT
Value at 1800UT: sum of precipitation between 0550-1750UT
Value at 0000UT: sum of precipitation between 1750-2350UT
Temperature
TEMP = air temperature at 1.5m in °C (hourly)
1 value every hour: average measured between (T – 11 min) and (T – 10 min)
TEMP_MIN = minimum temperature between 18h UT (previous day) and 6h UT (current day) in °C (1 value per day)
min between 1750UT (previous day) and 0550UT (current day).
TEMP_MAX = maximum temperature between 6h UT and 18h UT in °C (1 value per day)
max between 0550 and 1750UT
TEMP_GRASS_MIN = minimum temperature at the soil (°C) at 6UT and 9UT
Temperature measured between 1750 to 0550 for 0600 UT and between 2150 to 0850 for 0900UT
Wind
WIND_SPEED = average wind speed of the last 10 minutes at 10m altitude (hourly)
measured between (T – 20 min) and (T – 10 min)
WIND_SPEED_UNIT = unit of the wind speed
0,1 = m/s or 3,4 = knots
WIND_DIRECTION = wind direction in degrees (hourly)
average wind direction between (T – 20 min) and (T – 10 min)
| Degrees | Text | Degrees | Text |
|---|---|---|---|
| 350/360/10 | N | 200/210 | SSW |
| 20/30 | NNE | 220/230 | SW |
| 40/50 | NE | 240/250 | WSW |
| 60/70 | ENE | 260/270/280 | W |
| 80/90/100 | E | 290/300 | WNW |
| 110/120 | ESE | 310/320 | NW |
| 130/140 | SE | 330/340 | NNW |
| 150/160 | SSE | 999 | VARIABLE |
| 170/180/190 | S | - or 0 | NO WIND |
WIND_PEAK_SPEED = maximum wind speed (m/s)
- Value at 0300UT: maximum between 2350-0250UT
- Value at 0600UT: maximum between 2350-0550UT
- Value at 0900UT: maximum between 0550-0850UT
- Value at 1200UT: maximum between 0550-1150UT
- Value at 1500UT: maximum between 1150-1450UT
- Value at 1800UT: maximum between 1150-1750UT
- Value at 2100UT: maximum between 1750-2050UT
- Value at 0000UT: maximum between 1750-2350UT
Relative humidity
HUMIDITY_RELATIVE = relative humidity of the air in % (hourly)
average RH measured/calculated between (T – 11 min) and (T – 10 min)
Weather type
WEATHER_CURRENT = description of the current weather type (hourly)
instantaneous
| Code | Current weather |
|---|---|
| 0 | clear skies |
| 1 | clouds dissolving |
| 2 | state of sky unchanged |
| 3 | clouds developing |
| 4 | visibility reduced by smoke |
| 5 | haze |
| 6 | widespread dust in suspension not raised by wind |
| 7 | dust or sand raised by wind |
| 8 | well developed dust or sand whirls |
| 9 | dust or sand storm within sight but not at station |
| 10 | mist |
| 11 | patches of shallow fog |
| 12 | continuous shallow fog |
| 13 | lightning visible, no thunder heard |
| 14 | precipitation within sight but not hitting ground |
| 15 | distant precipitation but not falling at station |
| 16 | nearby precipitation but not falling at station |
| 17 | thunderstorm but no precipitation falling at station |
| 18 | squalls within sight but no precipitation falling at station |
| 19 | funnel clouds within sight |
| 20 | drizzle (not freezing) or snow grains |
| 21 | rain |
| 22 | snow |
| 23 | rain and snow |
| 24 | freezing rain |
| 25 | rain showers |
| 26 | snow showers |
| 27 | hail showers |
| 28 | fog |
| 29 | thunderstorms |
| 30 | slight to moderate duststorm, decreasing in intensity |
| 31 | slight to moderate duststorm, no change |
| 32 | slight to moderate duststorm, increasing in intensity |
| 33 | severe duststorm, decreasing in intensity |
| 34 | severe duststorm, no change |
| 35 | severe duststorm, increasing in intensity |
| 36 | slight to moderate drifting snow, below eye level |
| 37 | heavy drifting snow, below eye level |
| 38 | slight to moderate drifting snow, above eye level |
| 39 | heavy drifting snow, above eye level |
| 40 | Fog at a distance |
| 41 | patches of fog |
| 42 | fog, sky visible, thinning |
| 43 | fog, sky not visible, thinning |
| 44 | fog, sky visible, no change |
| 45 | fog, sky not visible, no change |
| 46 | fog, sky visible, becoming thicker |
| 47 | fog, sky not visible, becoming thicker |
| 48 | fog, depositing rime, sky visible |
| 49 | fog, depositing rime, sky not visible |
| 50 | intermittent light drizzle |
| 51 | continuous light drizzle |
| 52 | intermittent moderate drizzle |
| 53 | continuous moderate drizzle |
| 54 | intermittent heavy drizzle |
| 55 | continuous heavy drizzle |
| 56 | light freezing drizzle |
| 57 | moderate to heavy freezing drizzle |
| 58 | light drizzle and rain |
| 59 | moderate to heavy drizzle and rain |
| 60 | intermittent light rain |
| 61 | continuous light rain |
| 62 | intermittent moderate rain |
| 63 | continuous moderate rain |
| 64 | intermittent heavy rain |
| 65 | continuous heavy rain |
| 66 | light freezing rain |
| 67 | moderate to heavy freezing rain |
| 68 | light rain and snow |
| 69 | moderate to heavy rain and snow |
| 70 | intermittent light snow |
| 71 | continuous light snow |
| 72 | intermittent moderate snow |
| 73 | continuous moderate snow |
| 74 | intermittent heavy snow |
| 75 | continuous heavy snow |
| 76 | diamond dust |
| 77 | snow grains |
| 78 | snow crystals |
| 79 | ice pellets |
| 80 | light rain showers |
| 81 | moderate to heavy rain showers |
| 82 | violent rain showers |
| 83 | light rain and snow showers |
| 84 | moderate to heavy rain and snow showers |
| 85 | light snow showers |
| 86 | moderate to heavy snow showers |
| 87 | light snow/ice pellet showers |
| 88 | moderate to heavy snow/ice pellet showers |
| 89 | light hail showers |
| 90 | moderate to heavy hail showers |
| 91 | thunderstorm in past hour, currently only light rain |
| 92 | thunderstorm in past hour, currently only moderate to heavy rain |
| 93 | thunderstorm in past hour, currently only light snow or rain/snow mix |
| 94 | thunderstorm in past hour, currently only moderate to heavy snow or rain/snow mix |
| 95 | light to moderate thunderstorm |
| 96 | light to moderate thunderstorm with hail |
| 97 | heavy thunderstorm |
| 98 | heavy thunderstorm with duststorm |
| 99 | heavy thunderstorm with hail |
| 100 | No significant weather observed |
| 101 | Clouds generally dissolving or becoming less developed during the past hour |
| 102 | State of sky on the whole unchanged during the past hour |
| 103 | Clouds generally forming or developing during the past hour |
| 104 | Haze or smoke, or dust in suspension in the air, visibility equal to, or greater than, 1 km |
| 105 | Haze or smoke, or dust in suspension in the air, visibility less than 1 km |
| 110 | Mist |
| 111 | Diamond dust |
| 112 | Distant lightning |
| 118 | Squalls |
| 120 | Fog |
| 121 | Precipitation |
| 122 | Drizzle (not freezing) or snow grains |
| 123 | Rain (not freezing) |
| 124 | Snow |
| 125 | Freezing drizzle or freezing rain |
| 126 | Thunderstorm (with or without precipitation) |
| 127 | Blowing or drifting snow or sand |
| 128 | Blowing or drifting snow or sand, visibility equal to, or greater than, 1 km |
| 129 | Blowing or drifting snow or sand, visibility less than 1 km |
| 130 | Fog |
| 131 | Fog or ice fog in patches |
| 132 | Fog or ice fog, has become thinner during the past hour |
| 133 | Fog or ice fog, no appreciable change during the past hour |
| 134 | Fog or ice fog, has begun or become thicker during the past hour |
| 135 | Fog, depositing rime |
| 140 | Precipitation |
| 141 | Precipitation, slight or moderate |
| 142 | Precipitation, heavy |
| 143 | Liquid precipitation, slight or moderate |
| 144 | Liquid precipitation, heavy |
| 145 | Solid precipitation, slight or moderate |
| 146 | Solid precipitation, heavy |
| 147 | Freezing precipitation, slight or moderate |
| 148 | Freezing precipitation, heavy |
| 150 | Drizzle |
| 151 | Drizzle, not freezing, slight |
| 152 | Drizzle, not freezing, moderate |
| 153 | Drizzle, not freezing, heavy |
| 154 | Drizzle, freezing, slight |
| 155 | Drizzle, freezing, moderate |
| 156 | Drizzle, freezing, heavy |
| 157 | Drizzle and rain, slight |
| 158 | Drizzle and rain, moderate or heavy |
| 160 | Rain |
| 161 | Rain, not freezing, slight |
| 162 | Rain, not freezing, moderate |
| 163 | Rain, not freezing, heavy |
| 164 | Rain, freezing, slight |
| 165 | Rain, freezing, moderate |
| 166 | Rain, freezing, heavy |
| 167 | Rain (or drizzle) and snow, slight |
| 168 | Rain (or drizzle) and snow, moderate or heavy |
| 170 | snow |
| 171 | Snow, slight |
| 172 | Snow, moderate |
| 173 | Snow, heavy |
| 174 | Ice pellets, slight |
| 175 | Ice pellets, moderate |
| 176 | Ice pellets, heavy |
| 177 | Snow grains |
| 178 | Ice crystals |
| 180 | Shower(s) or intermittent precipitation |
| 181 | Rain shower(s) or intermittent rain, slight |
| 182 | Rain shower(s) or intermittent rain, moderate |
| 183 | Rain shower(s) or intermittent rain, heavy |
| 184 | Rain shower(s) or intermittent rain, violent |
| 185 | Snow shower(s) or intermittent snow, slight |
| 186 | Snow shower(s) or intermittent snow, moderate |
| 187 | Snow shower(s) or intermittent snow, heavy |
| 189 | Hail |
| 190 | Thunderstorm |
| 191 | Thunderstorm, slight or moderate, with no precipitation |
| 192 | Thunderstorm, slight or moderate, with rain showers and/or snow showers |
| 193 | Thunderstorm, slight or moderate, with hail |
| 194 | Thunderstorm, heavy, with no precipitation |
| 195 | Thunderstorm, heavy, with rain showers and/or snow showers |
| 196 | Thunderstorm, heavy, with hail |
| 199 | Tornado |
| 204 | Volcanic ash suspended in the air aloft |
| 206 | Thick dust haze, visibility less than 1 km |
| 207 | Blowing spray at the station |
| 208 | Drifting dust (sand) |
| 209 | Wall of dust or sand in distance (like haboob) |
| 210 | Snow haze |
| 211 | Whiteout |
| 213 | Lightning, cloud to surface |
| 217 | Dry thunderstorm |
| 219 | Tornado cloud (destructive) at or within sight of the station during preceding hour or at the time of observation |
| 220 | Deposition of volcanic ash |
| 221 | Deposition of dust or sand |
| 222 | Deposition of dew |
| 223 | Deposition of wet snow |
| 224 | Deposition of soft rime |
| 225 | Deposition of hard rime |
| 226 | Deposition of hoar frost |
| 227 | Deposition of glaze |
| 228 | Deposition of ice crust (ice slick) |
| 230 | Duststorm or sandstorm with temperature below 0° C |
| 239 | Blowing snow, impossible to determine whether snow is falling or not |
| 241 | Fog on sea |
| 242 | Fog in valleys |
| 243 | Arctic or Antarctic sea smoke |
| 244 | Steam fog (sea, lake or river) |
| 245 | Steam log (land) |
| 246 | Fog over ice or snow cover |
| 247 | Dense fog, visibility 60–90 m |
| 248 | Dense fog, visibility 30–60 m |
| 249 | Dense fog, visibility less than 30 m |
| 250 | Drizzle, rate of fall less than 0.10 mm h-1 |
| 251 | Drizzle, rate of fall 0.10–0.19 mm h–1 |
| 252 | Drizzle, rate of fall 0.20–0.39 mm h–1 |
| 253 | Drizzle, rate of fall 0.40–0.79 mm h-1 |
| 254 | Drizzle, rate of fall 0.80–1.59 mm h–1 |
| 255 | Drizzle, rate of fall 1.60–3.19 mm h–1 |
| 256 | Drizzle, rate of fall 3.20–6.39 mm h–1 |
| 257 | Drizzle, rate of fall 6.4 mm h-1 or more |
| 259 | Drizzle and snow |
| 260 | Rain, rate of fall less than 1.0 mm h-1 |
| 261 | Rain, rate of fall 1.0–1.9 mm h-1 |
| 262 | Rain, rate of fall 2.0–3.9 mm h–1 |
| 263 | Rain, rate of fall 4.0–7.9 mm h–1 |
| 264 | Rain, rate of fall 8.0–15.9 mm h–1 |
| 265 | Rain, rate of fall 16.0–31.9 mm h–1 |
| 266 | Rain, rate of fall 32.0–63.9 mm h–1 |
| 267 | Rain, rate of fall 64.0 mm h–1 or more |
| 270 | Snow, rate of fall less than 1.0 cm h-1 |
| 271 | Snow, rate of fall 1.0–1.9 cm h–1 |
| 272 | Snow, rate of fall 2.0–3.9 cm h–1 |
| 273 | Snow, rate of fall 4.0–7.9 cm h–1 |
| 274 | Snow, rate of fall 8.0–15.9 cm h–1 |
| 275 | Snow, rate of fall 16.0–31.9 cm h–1 |
| 276 | Snow, rate of fall 32.0–63.9 cm h–1 |
| 277 | Snow, rate of fall 64.0 cm h–1 or more |
| 278 | Snow or ice crystal precipitation from a clear sky |
| 279 | Wet snow, freezing on contact |
| 280 | Precipitation of rain |
| 281 | Precipitation of rain, freezing |
| 282 | Precipitation of rain and snow mixed |
| 283 | Precipitation of snow |
| 284 | Precipitation of snow pellets or small hall |
| 285 | Precipitation of snow pellets or small hail, with rain |
| 286 | Precipitation of snow pellets or small hail, with rain and snow mixed |
| 287 | Precipitation of snow pellets or small hail, with snow |
| 288 | Precipitation of hail |
| 289 | Precipitation of hail, with rain |
| 290 | Precipitation of hall, with rain and snow mixed |
| 291 | Precipitation of hail, with snow |
| 292 | Shower(s) or thunderstorm over sea |
| 293 | Shower(s) or thunderstorm over mountains |
| 508 | No significant phenomenon to report, present and past weather omitted |
| 509 | No observation, data not available, present and past weather omitted |
| 510 | Present and past weather missing, but expected |
| 511 | Missing value |
Pressure
PRESSURE = air pressure at sea level (hPa) (hourly)
measured between (T – 11 min) and (T – 10 min)
PRESSURE_STATION_LEVEL = air pressure at station level (hPa) (hourly)
measured between (T – 11 min) and (T – 10 min)
Sunshine duration
SUN_DURATION_24HOURS = sunshine duration (period during which more than 120W/m² in solar radiation is measured) over the last 24h (in minutes) (1 value per day)
measured between (T – 24 h 10 min) and (T – 10 min)
Global radiation
SHORT_WAVE_FROM_SKY_24HOURS: Global solar radiation integrated over 24h (in J/m²)
Global radiation measured between between (T – 24 h 10 min) and (T – 10 min)
Total cloudiness
CLOUDINESS = part of the sky covered in clouds (in octas)
instantaneous
Synoptic hours (worldwise use)
| Temp + relative humidity + pressure |
Temp_min | Temp_max | Temp_grass | Precip | Wind speed + Wind direction |
Wind peak speed | Sunshine duration + global radiation |
|
|---|---|---|---|---|---|---|---|---|
| 0000 UT | 23:49-23:50 | 17:50-23:50 | 23:40-23:50 | 17:50-23:50 | 23:50-23:50 | |||
| 0100 UT | 00:49-00:50 | 00:40-00:50 | ||||||
| 0200 UT | 01:49-01:50 | 01:40-01:50 | ||||||
| 0300 UT | 02:49-02:50 | 02:40-02:50 | 23:50-02:50 | |||||
| 0400 UT | 03:49-03:50 | 03:40-03:50 | ||||||
| 0500 UT | 04:49-04:50 | 04:40-04:50 | ||||||
| 0600 UT | 05:49-05:50 | 17:50-05:50 | 17:50-05:50 | 17:50-05:50 | 05:40-05:50 | 23:50-05:50 | ||
| 0700 UT | 06:49-06:49 | 06:40-06:50 | ||||||
| 0800 UT | 07:49-07:50 | 07:40-07:50 | ||||||
| 0900 UT | 08:49-08:50 | 21:50-08:50 | 08:40-08:50 | 05:50-08:50 | ||||
| 1000 UT | 09:49-09:50 | 09:40-09:50 | ||||||
| 1100 UT | 10:49-10:50 | 10:40-10:50 | ||||||
| 1200 UT | 11:49-11:50 | 05:50-11:50 | 11:40-11:50 | 05:50-11:50 | ||||
| 1300 UT | 12:49-12:50 | 12:40-12-50 | ||||||
| 1400 UT | 13:49-13:50 | 13:40-13:50 | ||||||
| 1500 UT | 14:49-14:50 | 14:40-14:50 | 11:50-14:50 | |||||
| 1600 UT | 15:49-15:50 | 15:40-15:50 | ||||||
| 1700 UT | 16:49-16:49 | 16:40-16:50 | ||||||
| 1800 UT | 17:49-17:50 | 05:50-17:50 | 05:50-17:50 | 17:40-17:50 | 11:50-17:50 | |||
| 1900 UT | 18:49-18:50 | 18:40-18:50 | ||||||
| 2000 UT | 19:49-19:50 | 19:40-19:50 | ||||||
| 2100 UT | 20:49-20:50 | 20:40-20:50 | 17:50-20:50 | |||||
| 2200 UT | 21:49-21:50 | 21:40-21:50 | ||||||
| 2300 UT | 22:49-22:50 | 22:40-22:50 |
Last update : 24/09/2021 16:11