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The next information were extracted from World Meteorological Organization (WMO). Manual on Codes (WMO-No. 306), Volume I.1. Geneva, 2019..
# From Code Table 4377
visibility_codes <- c(
"00" = "< 0.1", "01" = "0.1", "02" = "0.2", "03" = "0.3", "04" = "0.4",
"05" = "0.5", "06" = "0.6", "07" = "0.7", "08" = "0.8", "09" = "0.9",
"10" = "1", "11" = "1.1", "12" = "1.2", "13" = "1.3", "14" = "1.4",
"15" = "1.5", "16" = "1.6", "17" = "1.7", "18" = "1.8", "19" = "1.9",
"20" = "2", "21" = "2.1", "22" = "2.2", "23" = "2.3", "24" = "2.4",
"25" = "2.5", "26" = "2.6", "27" = "2.7", "28" = "2.8", "29" = "2.9",
"30" = "3", "31" = "3.1", "32" = "3.2", "33" = "3.3", "34" = "3.4",
"35" = "3.5", "36" = "3.6", "37" = "3.7", "38" = "3.8", "39" = "3.9",
"40" = "4", "41" = "4.1", "42" = "4.2", "43" = "4.3", "44" = "4.4",
"45" = "4.5", "46" = "4.6", "47" = "4.7", "48" = "4.8", "49" = "4.9",
"50" = "5",
# 51-55: Not used
"56" = "6", "57" = "7", "58" = "8", "59" = "9", "60" = "10",
"61" = "11", "62" = "12", "63" = "13", "64" = "14", "65" = "15",
"66" = "16", "67" = "17", "68" = "18", "69" = "19", "70" = "20",
"71" = "21", "72" = "22", "73" = "23", "74" = "24", "75" = "25",
"76" = "26", "77" = "27", "78" = "28", "79" = "29", "80" = "30",
"81" = "35", "82" = "40", "83" = "45", "84" = "50", "85" = "55",
"86" = "60", "87" = "65", "88" = "70", "89" = "> 70",
"90" = "< 0.05", "91" = "0.05", "92" = "0.2", "93" = "0.5", "94" = "1",
"95" = "2", "96" = "4", "97" = "10", "98" = "20", "99" = ">= 50"
)
# Example
user_data <- data.frame(Visibilities = c(0, 91, 58, 5))
codes_formatted <- sprintf("%02d", user_data$Visibilities) # "00", "05", "58", "91"
user_data$Visibilities <- visibility_codes[codes_formatted]
user_data
#> Visibilities
#> 1 < 0.1
#> 2 0.05
#> 3 8
#> 4 0.5# From Code Table 1600
cloud_height_codes <- c(
"0" = "0 to 50 m",
"1" = "50 to 100 m",
"2" = "100 to 200 m",
"3" = "200 to 300 m",
"4" = "300 to 600 m",
"5" = "600 to 1 000 m",
"6" = "1 000 to 1 500 m",
"7" = "1 500 to 2 000 m",
"8" = "2 000 to 2 500 m",
"9" = "2 500 m or more, or no clouds",
"/" = "Height of base of cloud not known"
)# From Code Table 4677
present_weather <- c(
"00" = "Cloud development not observed or not observable",
"01" = "Clouds generally dissolving or becoming less developed",
"02" = "State of sky on the whole unchanged",
"03" = "Clouds generally forming or developing",
"04" = "Visibility reduced by smoke, e.g. veldt or forest fires, industrial smoke or volcanic ashes",
"05" = "Haze",
"06" = "Widespread dust in suspension in the air, not raised by wind at or near the station at the time of observation",
"07" = "Dust or sand raised by wind at or near the station at the time of observation, but no well-developed dust whirl(s) or sand whirl(s), and no duststorm or sandstorm seen; or, in the case of ships, blowing spray at the station",
"08" = "Well-developed dust whirl(s) or sand whirl(s) seen at or near the station during the preceding hour or at the time of observation, but no duststorm or sandstorm",
"09" = "Duststorm or sandstorm within sight at the time of observation, or at the station during the preceding hour",
"10" = "Mist",
"11" = "Patches of shallow fog or ice fog at the station, whether on land or sea, not deeper than about 2 metres on land or 10 metres at sea",
"12" = "More or less continuous shallow fog or ice fog at the station, whether on land or sea, not deeper than about 2 metres on land or 10 metres at sea",
"13" = "Lightning visible, no thunder heard",
"14" = "Precipitation within sight, not reaching the ground or the surface of the sea",
"15" = "Precipitation within sight, reaching the ground or the surface of the sea, but distant, i.e. estimated to be more than 5 km from the station",
"16" = "Precipitation within sight, reaching the ground or the surface of the sea, near to, but not at the station",
"17" = "Thunderstorm, but no precipitation at the time of observation",
"18" = "Squalls at or within sight of the station during the preceding hour or at the time of observation",
"19" = "Funnel cloud(s) at or within sight of the station during the preceding hour or at the time of observation",
"20" = "Drizzle (not freezing) or snow grains not falling as shower(s), during the preceding hour",
"21" = "Rain (not freezing) not falling as shower(s), during the preceding hour",
"22" = "Snow not falling as shower(s), during the preceding hour",
"23" = "Rain and snow or ice pellets not falling as shower(s), during the preceding hour",
"24" = "Freezing drizzle or freezing rain not falling as shower(s), during the preceding hour",
"25" = "Shower(s) of rain, during the preceding hour",
"26" = "Shower(s) of snow, or of rain and snow, during the preceding hour",
"27" = "Shower(s) of hail, or of rain and hail, during the preceding hour",
"28" = "Fog or ice fog, during the preceding hour",
"29" = "Thunderstorm (with or without precipitation), during the preceding hour",
"30" = "Slight or moderate duststorm or sandstorm - has decreased during the preceding hour",
"31" = "Slight or moderate duststorm or sandstorm - no appreciable change during the preceding hour",
"32" = "Slight or moderate duststorm or sandstorm - has begun or has increased during the preceding hour",
"33" = "Severe duststorm or sandstorm - has decreased during the preceding hour",
"34" = "Severe duststorm or sandstorm - no appreciable change during the preceding hour",
"35" = "Severe duststorm or sandstorm - has begun or has increased during the preceding hour",
"36" = "Slight or moderate drifting snow (generally low below eye level)",
"37" = "Heavy drifting snow (generally low below eye level)",
"38" = "Slight or moderate blowing snow (generally high above eye level)",
"39" = "Heavy blowing snow (generally high above eye level)",
"40" = "Fog or ice fog at a distance at the time of observation, but not at the station during the preceding hour, the fog or ice fog extending to a level above that of the observer",
"41" = "Fog or ice fog in patches",
"42" = "Fog or ice fog, sky visible - has become thinner during the preceding hour",
"43" = "Fog or ice fog, sky invisible - has become thinner during the preceding hour",
"44" = "Fog or ice fog, sky visible - no appreciable change during the preceding hour",
"45" = "Fog or ice fog, sky invisible - no appreciable change during the preceding hour",
"46" = "Fog or ice fog, sky visible - has begun or has become thicker during the preceding hour",
"47" = "Fog or ice fog, sky invisible - has begun or has become thicker during the preceding hour",
"48" = "Fog, depositing rime, sky visible",
"49" = "Fog, depositing rime, sky invisible",
"50" = "Drizzle, not freezing, intermittent, slight at time of observation",
"51" = "Drizzle, not freezing, continuous, slight at time of observation",
"52" = "Drizzle, not freezing, intermittent, moderate at time of observation",
"53" = "Drizzle, not freezing, continuous, moderate at time of observation",
"54" = "Drizzle, not freezing, intermittent, heavy (dense) at time of observation",
"55" = "Drizzle, not freezing, continuous, heavy (dense) at time of observation",
"56" = "Drizzle, freezing, slight",
"57" = "Drizzle, freezing, moderate or heavy (dense)",
"58" = "Drizzle and rain, slight",
"59" = "Drizzle and rain, moderate or heavy",
"60" = "Rain, not freezing, intermittent, slight at time of observation",
"61" = "Rain, not freezing, continuous, slight at time of observation",
"62" = "Rain, not freezing, intermittent, moderate at time of observation",
"63" = "Rain, not freezing, continuous, moderate at time of observation",
"64" = "Rain, not freezing, intermittent, heavy at time of observation",
"65" = "Rain, not freezing, continuous, heavy at time of observation",
"66" = "Rain, freezing, slight",
"67" = "Rain, freezing, moderate or heavy (dense)",
"68" = "Rain or drizzle and snow, slight",
"69" = "Rain or drizzle and snow, moderate or heavy",
"70" = "Intermittent fall of snowflakes, slight at time of observation",
"71" = "Continuous fall of snowflakes, slight at time of observation",
"72" = "Intermittent fall of snowflakes, moderate at time of observation",
"73" = "Continuous fall of snowflakes, moderate at time of observation",
"74" = "Intermittent fall of snowflakes, heavy at time of observation",
"75" = "Continuous fall of snowflakes, heavy at time of observation",
"76" = "Diamond dust (with or without fog)",
"77" = "Snow grains (with or without fog)",
"78" = "Isolated star-like snow crystals (with or without fog)",
"79" = "Ice pellets",
"80" = "Rain shower(s), slight",
"81" = "Rain shower(s), moderate or heavy",
"82" = "Rain shower(s), violent",
"83" = "Shower(s) of rain and snow mixed, slight",
"84" = "Shower(s) of rain and snow mixed, moderate or heavy",
"85" = "Snow shower(s), slight",
"86" = "Snow shower(s), moderate or heavy",
"87" = "Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed - slight",
"88" = "Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed - moderate or heavy",
"89" = "Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder - slight",
"90" = "Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder - moderate or heavy",
"91" = "Slight rain at time of observation - thunderstorm during the preceding hour but not at time of observation",
"92" = "Moderate or heavy rain at time of observation - thunderstorm during the preceding hour",
"93" = "Slight snow, or rain and snow mixed or hail at time of observation - thunderstorm during the preceding hour but not at time of observation",
"94" = "Moderate or heavy snow, or rain and snow mixed or hail at time of observation - thunderstorm during the preceding hour but not at time of observation",
"95" = "Thunderstorm, slight or moderate, without hail, but with rain and/or snow at time of observation",
"96" = "Thunderstorm, slight or moderate, with hail at time of observation",
"97" = "Thunderstorm, heavy, without hail, but with rain and/or snow at time of observation",
"98" = "Thunderstorm combined with duststorm or sandstorm at time of observation",
"99" = "Thunderstorm, heavy, with hail at time of observation"
)# From Code Table 4561
past_weather <- c(
"0" = "Cloud covering 1/2 or less of the sky throughout the appropriate period",
"1" = "Cloud covering more than 1/2 of the sky during part of the appropriate period and covering 1/2 or less during part of the period",
"2" = "Cloud covering more than 1/2 of the sky throughout the appropriate period",
"3" = "Sandstorm, duststorm or blowing snow",
"4" = "Fog or ice fog or thick haze",
"5" = "Drizzle",
"6" = "Rain",
"7" = "Snow, or rain and snow mixed",
"8" = "Shower(s)",
"9" = "Thunderstorm(s) with or without precipitation"
)Important Note: The original Code Table use “/” instead of “10”.
# From Code Table 0513
low_cloud_codes <- c(
"0" = "No CL clouds",
"1" = "Cumulus humilis or cumulus fractus other than of bad weather,* or both",
"2" = "Cumulus mediocris or congestus, with or without cumulus of species fractus or humilis or stratocumulus, all having their bases at the same level",
"3" = "Cumulonimbus calvus, with or without cumulus, stratocumulus or Stratus",
"4" = "Stratocumulus cumulogenitus",
"5" = "Stratocumulus other than stratocumulus cumulogenitus",
"6" = "Stratus nebulosus or Stratus fractus other than of bad weather,* or both",
"7" = "Stratus fractus or cumulus fractus of bad weather,* or both (pannus), usually below altostratus or nimbostratus",
"8" = "Cumulus and stratocumulus other than stratocumulus cumulogenitus, with bases at different levels",
"9" = "Cumulonimbus capillatus (often with an anvil), with or without cumulonimbus calvus, cumulus, stratocumulus, Stratus or pannus",
"10" = "CL clouds invisible owing to darkness, fog, blowing dust or sand, or other similar phenomena"
)
# From Code Table 0515
medium_cloud_codes <- c(
"0" = "No CM clouds",
"1" = "Altostratus translucidus",
"2" = "Altostratus opacus or nimbostratus",
"3" = "Altocumulus translucidus at a single level",
"4" = "Patches (often lenticular) of altocumulus translucidus, continually changing and occurring at one or more levels",
"5" = "Altocumulus translucidus in bands, or one or more layers of altocumulus translucidus or opacus, progressively invading the sky; these altocumulus clouds generally thicken as a whole",
"6" = "Altocumulus cumulogenitus (or cumulonimbogenitus)",
"7" = "Altocumulus translucidus or opacus in two or more layers, or altocumulus opacus in a single layer, not progressively invading the sky, or altocumulus with altostratus or nimbostratus",
"8" = "Altocumulus castellanus or floccus",
"9" = "Altocumulus of a chaotic sky, generally at several levels",
"10" = "CM clouds invisible owing to darkness, fog, blowing dust or sand, or other similar phenomena, or because of continuous layer of lower clouds"
)
# From Code Table 0509
high_cloud_codes <- c(
"0" = "No CH clouds",
"1" = "Cirrus fibratus, sometimes uncinus, not progressively invading the sky",
"2" = "Cirrus spissatus, in patches or entangled sheaves, which usually do not increase and sometimes seem to be the remains of the upper part of a cumulonimbus; or cirrus castellanus or floccus",
"3" = "Cirrus spissatus cumulonimbogenitus",
"4" = "Cirrus uncinus or fibratus, or both, progressively invading the sky; they generally thicken as a whole",
"5" = "Cirrus (often in bands) and cirrostratus, or cirrostratus alone, progressively invading the sky; they generally thicken as a whole, but the continuous veil does not reach 45 degrees above the horizon",
"6" = "Cirrus (often in bands) and cirrostratus, or cirrostratus alone, progressively invading the sky; they generally thicken as a whole; the continuous veil extends more than 45 degrees above the horizon, without the sky being totally covered",
"7" = "Cirrostratus covering the whole sky",
"8" = "Cirrostratus not progressively invading the sky and not entirely covering it",
"9" = "Cirrocumulus alone, or cirrocumulus predominant among the CH clouds",
"10" = "CH clouds invisible owing to darkness, fog, blowing dust or sand, or other similar phenomena, or because of a continuous layer of lower clouds"
)# From Code Table 0901
# Ground without snow or ice (E)
ground_state1 <- c(
"0" = "Surface of ground dry (without cracks and no appreciable amount of dust or loose sand)",
"1" = "Surface of ground moist",
"2" = "Surface of ground wet (standing water in small or large pools on surface)",
"3" = "Flooded",
"4" = "Surface of ground frozen",
"5" = "Glaze on ground",
"6" = "Loose dry dust or sand not covering ground completely",
"7" = "Thin cover of loose dry dust or sand covering ground completely",
"8" = "Moderate or thick cover of loose dry dust or sand covering ground completely",
"9" = "Extremely dry with cracks"
)
# From Code Table 0975
# Ground with snow or ice (E')
ground_snow_ice_codes <- c(
"0" = "Ground predominantly covered by ice",
"1" = "Compact or wet snow (with or without ice) covering less than one-half of the ground",
"2" = "Compact or wet snow (with or without ice) covering at least one-half of the ground but ground not completely covered",
"3" = "Even layer of compact or wet snow covering ground completely",
"4" = "Uneven layer of compact or wet snow covering ground completely",
"5" = "Loose dry snow covering less than one-half of the ground",
"6" = "Loose dry snow covering at least one-half of the ground but ground not completely covered",
"7" = "Even layer of loose dry snow covering ground completely",
"8" = "Uneven layer of loose dry snow covering ground completely",
"9" = "Snow covering ground completely; deep drifts"
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They may not be fully stable and should be used with caution. We make no claims about them.
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