§The symbol is not plotted for "ww" when "00" is reported. When "01, 02, or 03" is reported for "ww", the 



symbol is plotted on the station circle, 

 t Refers to 'hail" only. tt Refers to "Soft hail", "small hail", and "hail". 



PRESENT WEATHER 



Clouds of type C. 



Clouds of type C. 



Cloud of type C, 



Type of Cloud 



W 

 Past Weather 



Total amount all clouds 



Barometer characteristic 



Cloud development NOT observed or 

 NOT observable during past hour.s 



10 



Light fog. 



20 



'] 



Drizzle (NOT freezing and NOT 

 falling as showers) during past hour, 

 but NOT at time of ob. 



■& 



Slight or moderate duststorm or sand- 

 storm, has decreased during past hour. 



40 



Fog at distance at time of observa- 

 tion, but NOT at station during past 

 hour. 



50 



Intermittent drizzle (NOT freezing) 

 slight at time of observation. 



60 



Intermittent rain (NOT freezing), 

 slight at time of observation. 



Intermittent fall of snow flakes, 

 slight at time of observation. 



80 



V 



Slight rain shower(s). 



V 



Moderate or heavy shower(s) of 

 hailtt, with or without rain or rain and 

 snow mixed, not associated with 

 thunder. 



01 



Clouds generally dissolving or be- 

 coming less developed during past 

 hour.§ 



11 



Patches of shallow fog at station, 

 NOT deeper than 6 feet on land. 



21 



'] 



Rain (NOT freezing and NOT falling 

 as showers) during past hour, but 

 NOT at time of ob. 



31 



5- 



Slight or moderate duststorm or sand- 

 storm, no appreciable change during 

 past hour. 



41 



Fog in patches. 



51 



1 1 



Continuous drizzle (NOT freezing) 

 slight at time of observation. 



61 



Continuous rain (NOT freezing), 

 slight at time of observation. 



* * 



Continuous fall of snow flakes, slight 

 at time of observation. 



81 



V 



Moderate or heavy rain shower(s). 



91 



K} 



Slight rain at time of observation; 

 thunderstorm during past hour, but NOT 

 at time of observation. 



02 



State of sky on the whole unchanged 

 during past hour.s 



12 



More or less continuous shallow fog 

 at station, NOT deeper than 6 feet on 

 land. 



22 



X 



'] 



Snow (NOT falling as showers) during 

 past hour, but NOT at time of observation. 



32 



Slight or moderate duststorm or sand- 

 storm, has increased during past hour. 



42 



Fog, sky discernible, has become 

 thinner during past hour. 



52 



Intermittent drizzle (NOT freezing) 

 moderate at time of observation. 



62 



Intermittent rain (NOT freezing), mod- 

 erate at time of observation. 



72 



* 

 * 



Intermittent fall of snow flakes, moder- 

 ate at time of observation. 



82 



V 



Violent rainshowers(s). 



92 



Kj 



Moderate or heavy rain at time of 

 observation; thunderstorm during past 

 hour, but NOT at time of observation. 



03 



Clouds generally forming or develop- 

 ing during past hour.§ 



13 



Lightning visible, no thunder heard. 



23 



;] 



Rain and snow (NOT falling as 

 showers) during past hour, but NOT at 

 timf of observation. 



33 



S 



Severe duststorm or sandstorm, has 

 decreased during past hour. 



43 



Fog, sky NOT discernible, has be- 

 come thinner during past hour. 



53 



1 

 * * 



Continuous drizzle (NOT freezing), 

 moderate at time of observation. 



63 



Continuous rain (NOT freezing), mod- 

 derate at time of observation. 



73 



* 

 * * 



Continuous fall of snow flakes, mod- 

 erate at time of observation. 



83 



* 



V 



Slight shower(s) of rain and snow 

 mixed. 



93 



K]*° R TC} 



Slight snow or rain and snow mixed 

 or hailt at time of observation; thun- 

 derstorm during past hour, but NOT at 

 time of observation. 



04 



rv/xT 1 



Visibility reduced by smoke. 



14 



Precipitation within sight, but NOT 

 reaching the ground. 



24 



OO 



Freezing drizzle or freezing ram 

 (NOT falling as showers) [luring past 

 hour, but NOT at time of observation. 



34 



S 



Severe duststorm or sandstorm, no 

 appreciable change during past hour. 



44 



Fog, sky discernible, no appreciable 

 change during past hour. 



54 9 



1 

 1 



Intermittent drizzle (NOT freezing), 

 iiiiaat time of observation. 



64 



Intermittent rain (NOT freezing), 

 heavy at time of observation. 



74 * 



* 



* 



Intermittent fall of snow flakes, 

 heavy at time of observation. 



84 



V 



Moderate or heavy shower(s) of rain 

 and snow mixed. 



94 



K$ ° R K] 



Moderate or heavy snow, or rain and 

 snow mixed or hailt at time of observa- 

 tion; thunderstorm during past hour, but 

 NOT at time of observation. 



05 



oo 



15 



Precipitation within sight, reaching 

 the ground, but distant from station. 



25 



V 



Showers of ram during past hour, 

 but NOT at time of observation. 



35 



Severe duststorm or sandstorm, has 

 increased during past hour. 



45 



Fog, sky NOT discernible, no 

 appreciable change during past hour. 



55 1 



1 



Continuous drizzle (NOT freezing), 

 thick at time of observation. 



65 



06 



S 



Widespread dust in suspension in the 

 air, NOT raised by wind, at time of 

 observation. 



16 



Precipitation within sight, reaching 

 the ground, near to but NOT at station. 



26 



* 



V 



Showers of snow, or of ram and snow, 

 during past hour, but NOT at time of 

 observation. 



36 



Slight or moderate drifting snow, 

 generally low. 



46 



Fog, sky discernible, has begun 

 or become thicker during past hour. 



56 



<?NJ 



Slight freezing drizzle. 



66 



Continuous rain (NOT freezing), 

 heavy. at time of observation. 



75 



* 

 * * 



Continuous fall of snow flakes, heavy 

 at time of observation. 



85 



* 



V 



Slight snow shower(s). 



95 • * 



TC 0R TC 



Slight or moderate thunderstorm with- 

 out hailt, but with rain and/or snow at 

 time of observation. 



(*\J 



Slight freezing rain. 



76 



< > 



Ice needles (with or without fog). 



07 



I v 



S 



Dust or sand raised by wind, at time 

 of ob. 



17 



R 



Thunder heard, but no precipitation 

 at the station. 



27 



A 



V 



Showers of hail, cr of hail and rain, 

 during past hour, but NOT at time of 

 observation. 



37 



4» 



Heavy drifting snow, generally low. 



47 



Fog, sky NOT discernible, has begun 

 or become thicker during past hour. 



57 



(jSsS) 



Moderate or thick freezing drizzle. 



67 



<«\S) 



Moderate or heavy freezing ram. 



77 



-A 



Granular snow (with or without fog). 





Moderate or heavy snow shower(s). 



TC 



Slight or moderate thunderstorm, with 

 hailt at time of observation. 



87 



V 



Slight shower(S) of soft or small hail 

 with or without rain or rain and snow 

 mixed. 



97 # * 



T5+T? 



Heavy thunderstorm, without hailt, 

 but with rain and/or snow at time of 

 observation. 



08 



. Well developed dust devil(s) within 

 past hour. 



18 



Squall(S) within sight during past 

 hour. 



28 



Fog during past hour, but NOT at 

 time of observation. 



38 



Slight or moderate-drifting snow, 

 generally high, 



48 



BsE 



Fog, depositing rime, sky discernible. 



58 



Drizzle and ram, slight. 



68 



Ram or drizzle and snow, slight. 



78 



Isolated starlike snow crystals (with 

 or without fog). 



Z^ 



V 



Moderate or heavy shower(s) of soft 

 or small hail'with or without rain or 

 rain and snow mixed. 



TC 



Thunderstorm combined with dust 

 storm or sandstorm at time of observa- 

 tion. 



09 



& 



Duststorm or sandstorm within sight 

 of or at station during past hour. 



19 



\ / 



/ \ 



Funnel cloud(s) within sight during 

 past hour. 



29 



K 



Thunderstorm (with or without 

 precipitation) during past hour, but 

 NOT at time of ob. 



39 



Heavy drifting snow, generally high. 



49 



3£ 



Fog, depositing rime, sky NOT 

 discernible. 



59 



Drizzle and rain, moderate or heavy. 



69 



Ram or drizzle and snow, moderate 

 or heavy. 



79 



Ice pellets (sleet, U. S. definition). 



89 



V 



Slight shower(s) of hailtt, with or 

 without rain or rain and snow mixed, 

 not associated with thunder. 



99 



A 



TC 



Heavy thunderstorm with hailt at 

 time of observation. 



. No Sc, St, Cu, or Cb clouds. 



C^ 



Ragged Cu, other than bad weather, 

 or Cu with little vertical development 

 and seemingly flattened, or both. 



^ 



Cu of considerable development, 

 generally towering, with or without 

 other Cu or Sc; bases all at same level. 



A 



Cb with tops lacking clear-cut out- 

 lines, but are clearly not fibrous, cirri- 

 form, or anvil shaped; Cu, Sc, or St may 

 be present. 



^> 



Sc formed by spreading out of Cu; Cu 

 may be present also. 



Sc not formed by spreading out of Cu. 



' St in 3 more or less continuous layer 

 and/or ragged shreds, but no Fs of bad 

 weather. 



7 



Fs and/or Fc of bad weather (scud) 

 usually under As and Ns. 



£^ 



Cu and Sc (not formed by spreading 

 out of Cu); base of Cu at a different 

 level than base of Sc. 



a 



No Ac, As or Ns clouds. 



As, the greatest part of which is 

 semitransparent through which the 

 sun or moon may be faintly visible as 

 through ground glass. 



^L 



As, the greatest part of which is 

 sufficiently dense to hide the sun or 

 moon, or Ns. 



V_A^ 



Ac (most of layer is semitransparent) 

 other than crenelated or in cumuliform 

 tufts; cloud elements change but slowly 

 with all bases at a single level. 



Patches of semitransparent Ac which 

 are at one or more levels; cloud elements 

 are continuously changing. 



6<j 



Semitransparent Ac in bands or Ac in 

 one more or less continuous layer gradu- 

 ally.spreading over sky and usually 

 thickening as a whole; the layer may 

 be opaque or a double sheet. 



r\ 



Ac formed by the spreading out of Cu. 



7 4o 



Double-layered Ac or an opaque 

 layer of Ac, not increasing over the 

 sky; or Ac coexisting with As or Ns or 

 with both. 



li 



Ac with sprouts in the form of small 

 towers or battlements or Ac having the 

 appearance of cumuliform tufts. 



NoCi, Cc, or Cs clouds. 



Filaments, strands, or hooks of Ci, 

 not increasing. 



_x> 



Dense Ci in patches or twisted 

 sheaves, usually not increasing; or Ci 

 with towers or battlements or resembl- 

 ing cumuliform tufts. 



3 



Ci, often anvil-shaped, derived from 

 or associated with Cb. 



Ci, hook-shaped and/or filaments, 

 spreading over the sky and generally 

 becoming denser as a whole. 



5 



2. 



Ci, often in converging bands, anu 

 Cs or Cs alone but increasing and grow- 

 ing denser as a whole; the continuous 

 veil not exceeding 45° above horizon. 



6 



2 



Ci, often in converging bands, and Cs 

 or Cs alone but increasing and growing 

 denser as a whole; the continuous veil 

 exceeds 45° above horizon but sky not 

 totally covered. 



2^, 



Veil of Cs completely covering the 

 sky. 



_S, 



4 



Cb having a clearly fibrous (cirriform) 

 top, often anvil-shaped, with or without 



Cu, Sc, St, or scud. 



Ac, generally at several layers in a 

 chaotic sky; dense Cirrus is usually 

 present. 



Cs not increasing and not completely 

 covering the sky. 



' £ 



Cc alone or Cc accompanied by Ci 

 and/or Cs, but Cc is the predominant 

 cirriform cloud. 



3 



KJ 



<2- 



<A 



Cloud covering % or less of sky 

 throughout the period. 



Cloud covering more than (J of sky 

 during part of period and covering '/ 2 or 

 less during part of period. 



2 



Cloud covering more than >i of sky 

 throughout the period. 



S-. 



■h 



Sandstorm, or duststorm, or drifting 

 jr blowing snow. 



Fog, or thick haze. 



Drizzle. 



Ram. 



A 



r\ 



Snow, or rain and snow mixed, or ice 

 pellets (sleet). 



V 



Shower(s). 



"R 



No clouds. 



One-tenth or less, but not zero. 



© 



Two- or three-tenths. 



cb 



Four-tenths. 



3 



Five -tenths. 



9 



Six-tenths. 



Rising then falling. Now higher than, 

 or the same as, 3 hours ago. 



Rising, then steady; or rising, then 

 rising more slowly. Now higher than 3 

 hours ago. 



Rising (steadily or unsteadily). Now 

 higher than 3 hours ago. 



Falling or steady, then rising; or 

 rising then rising more rapidly. Now 

 higher than 3 hours ago. 



Steady. Same as 3 hours ago. 



* 



Seven-or eight-tenths. 



o 



Nine-tenths or more, but not ten-tenths. 



Ten-tenths. 



Thunderstorm, with or without pre- 

 cipitation. 



Sky obscured, or cloud amount cannot 

 be estimated. 



Falling, then rising. Now lower than, 

 or the same as, 3 hours ago. 



Falling, then steady; or falling, then 

 falling more slowly. Now lower than 3 

 hours ago. 



Falling (steadily or unsteadily). Now 

 lower than 3 hoiTrs ago. 



Steady or rising, then falling; or fall- 

 ing, then falling more rapidly. Now 

 lower than 3 hours ago. 



Indicator figure. Regionally agreed 

 elements and NOT "pp" are reported by 

 the next two code figures. 



301121010441 6 9— OO 1 



FLDOO 



00030 



