現在天候（Present weather）（WMO 4501）
Based on WMO Code 4501 for recording present weather（更新日：平成19年5月9日）
CodeDescription

L0Clear(No cloud at any level)

L1

Partly cloudy(Scattered or broken)

L2

Continuous layer(s) of blowing snow

L3

Sandstorm, duststorm, or blowing snow

L4Fog, thick dust or haze

L5

DrizzleL6Rain

L7

Snow, or rain and snow mixed

L8Shower(s)L9Thunderstorm(s)Conversion from Beaufort weather notation to WMO Code 4501
Abbreviation

Description

CodeB

Blue sky whether with clear or hazy atmosphere, or sky not more than one-quarterclouded.

0BC

Sky between one-quarter and three-quarters clouded.

1

C

Mainly cloudy (not less than three-quarters covered).

1

D

Drizzle or fine rain.

5E

Wet air without rain falling.

4

FFog.

4

FE

Wet fog.

4

GGloomy.

2

HHail.

9KQ

Line squall.

9

LLightning.

9

M

Mist.

4

1

O

Overcast sky (i.e., the whole sky covered with unbroken cloud).

2

P

Passing showers.

8

QSqualls.

9

RRain.

6

RS

Sleet (i.e., rain and snow together).

7

SSnow.

7

TThunder.

9TL

Thunderstorm.

9U

Ugly, threatening sky.

2V

Unusual visibility.

0

Z

Dust haze; the turbid atmosphere or dry weather.

4

現在天候（Present Weather）（WMO Code 4677）
WMO Code 4677 for recording present weather
ww = 00 - 03
No meteors except photometeors
Codeww

Description

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 ** characteristic change of the state of sky during the past hour

ww = 04 - 09
Haze, dust, sand or smoke
Codeww

Description04

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 thetime of observation

2

07
08
09

Dust or sand raised by wind at or near the station at the time of observation, but no welldeveloped dust whirl(s) or sand whirl(s), and no duststorm or sandstorm seen
Well developed dust whirl(s) or sand whirl(s) seen at or near the station during thepreceding hour or at the time ot observation, but no duststorm or sandstorm
Duststorm or sandstorm within sight at the time of observation, or at the station during
the preceding hour

* The expression "at the station" refers to a land station or a ship.

ww = 10 - 19Codeww
101112

Description
Mist
Patches of shallow fog or ice fog at the station, whether on land or sea, not deeper thanabout 2 metres on land or 10 metres at sea
More or less continuous shallow fog or ice fog at the station, whether on land or sea, notdeeper than about 2 metres on land or 10 metres at sea

13Lightning visible, no thunder heard

14

Precipitation within sight, not reaching the ground or the surface of the sea

15161718
19

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
Precipitation within sight, reaching the ground or the surface of the sea, near to, but notat the station
Thunderstorm, but no precipitation at the time of observation
Squalls at or within sight of the station during the preceding hour or at the time ofobservation
Funnel cloud(s)** at or within sight of the station during the preceding hour or at thetime of observation* The expression "at the station" refers to a land station or a ship.
** Tornado cloud or waterspout.

ww = 20 - 29
Precipitation, fog, ice fog or thunderstorm at the station during the preceding hour but not at the time of observation
Code
wwDescription

20

Drizzle (not freezing) or snow grains not falling as shower(s)21Rain (not freezing) not falling as shower(s)22Snow not falling as shower(s)23Rain and snow or ice pellets, type (a) not falling as shower(s)24Freezing drizzle or freezing rain not falling as shower(s)25Shower(s) of rain3

26

Shower(s) of snow, or of rain and snow

27

Shower(s) of hail*, or of rain and hail*

28

Fog or ice fog

29

Thunderstorm (with or without precipitation)* Hail, ice pellets, type (b), snow pellets. French: grele, gresil ou neige roulee.

ww = 30 - 39
Duststorm, sandstorm, drifting or blowing snow
Codeww

Description

30

Slight or moderate duststorm or sandstorm - has decreased during the preceding hour

3132

Slight or moderate duststorm or sandstorm - no appreciable change during the precedinghour
Slight or moderate duststorm or sandstorm - has begun or has increased during thepreceding 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 blowing 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 drifting snow generally high (above eye level)

ww = 40 - 49
Fog or ice fog at the time of observation
Code
wwDescription40

Fog or ice fog at a distance at the time of observation, but not at the station during thepreceding 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 hour43

Fog or ice fog, sky invisible has become thinner during the preceding hour44

Fog or ice fog, sky visible no appreciable change during the preceding hour45

Fog or ice fog, sky invisible no appreciable change during the preceding hour4

46

Fog or ice fog, sky visible has begun or has become thicker during the preceding hour47

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

ww = 50 - 99
Precipitation at the station at the time of observation

ww = 50 - 59
DrizzleCodewwDescription

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 (dence) at time of observation

55

Drizzle, not freezing, continuous heavy (dence) at time of observation

56

Drizzle, freezing, slight57

Drizzle, freezing, moderate or heavy (dence)58

Drizzle and rain, slight59

Drizzle and rain, moderate or heavy

ww = 60 - 69
Rain
CodewwDescription

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

5

64

Rain, not freezing, intermittent heavy at time of observation

65

Rain, not freezing, continuous heavy at time of observation

66

Rain, freezing, slight67

Rain, freezing, moderate or heavy

68

Rain, or drizzle and snow, slight69

Rain, or drizzle and snow, moderate or heavy

ww = 70 - 79
Solid precipitation not in showers
CodewwDescription

70

Intermittent fall of snow flakes slight at time of observation

71

Continuous fall of snow flakes slight at time of observation

72

Intermittent fall of snow flakes moderate at time of observation

73

Continuous fall of snow flakes moderate at time of observation

74

Intermittent fall of snow flakes heavy at time of observation

75

Continuous fall of snow flakes heavy at time of observation

76

Ice prisms (with or without fog)

77

Snow grains (with or without fog)

78

Isolated starlike snow crystals (with or without fog)

79

Ice pellets, type (a)ww = 80 - 99
Showery precipitation, or precipitation with current or recent thunder storm
Code
ww

Description

80

Rain shower(s), slight81

Rain shower(s), moderate or heavy

82

Rain shower(s), violent

83

Shower(s) of rain and snow mixed, slight84

Shower(s) of rain and snow mixed, moderate or heavy

685

Snow shower(s), slight86

Snow shower(s), moderate or heavy

8788899091929394
95
96
97
98
99

Shower(s) of snow pellets or ice pellets, type (b), with or without rain or rain and snow
mixed - slight
Shower(s) of snow pellets or ice pellets, type (b), with or without rain or rain and snow
mixed - moderate or heavy
Shower(s) of hail*, with or without rain or rain and snow mixed, not associated withthunder - slight
Shower(s) of hail*, with or without rain or rain and snow mixed, not associated withthunder - moderate or heavy
Slight rain at time of observation - thunderstorm during the preceding hour but not attime of observation
Moderate or heavy rain at time of observation - thunderstorm during the preceding hour
but not at time of observation
Slight snow, or rain and snow mixed or hail** at time of observation - thunderstorm
during the preceding hour but not at time of observation
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
Thunderstorm, slight or moderate, without hail**, but with rain and/or snow at time ofobservation - thunderstorm at time of observation
Thunderstorm, slight or moderate, with hail** at time of observation - thunderstorm attime of observation
Thunderstorm, heavy, without hail**, but with rain and/or snow at time of observation thunderstorm at time of observation
Thunderstorm combined with duststorm or sandstorm at time of observation thunderstorm at time of observation
Thunderstorm, heavy, with hail** at time of observation - thunderstorm at time ofobservation* French: grele.
** Hail, ice pellets, type (b), snow pellets. French: grele, gresil ou neige roulee.

7