TABLE 25 

 Present Weather 

 WMO Code ^677 for recording present weather 



1- o 

 O ^ 0) 



o £ 

 X o 



o 

 a. 



0) 



Code figure 



WW 



00 



E 

 o 



o 



E 



(A 



■D 

 C 



(0 



3 

 T3 



ra 



I 



characteristic change 

 of the state of sky 

 during the past hour 



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 observa- 

 tion, but no well developed dust whirl(s) or sand whirl(s), and no dust- 

 storm or sandstorm seen 



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 I Patch« 



12 ] More 

 I continuous ' ^^ ^®^ 



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 



19 Funnel cloud(s) ** / hour or at the time of observation 



les of \ shallow fog or ice fog at the station, whether on land or 

 or less ( 5^^' "°^ deeper than about 2 metres on land or 10 metres 

 I at 



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

 •* Tornado cloud or waterspout. 



64 



