OPNAV FORM 3140-2 (Rev. 1-64) 

 (Effective January 1, 1964) 



RECCO CODE 



(Aerial Meteorological Reconnaissance Reporting Code) 



DATE 



ORGANIZATION 



TYPE A/C. 

 OBSERVER. 



Section 1 - MANDATORY 



i 



Section 2 - OPTIONAL 



~TET" 



NOTE 



10 



10 



11 



12 



13 



14 



15 



15 



16 



17 



18 



19 



Jmmiiiimmm 



20 



21 



22 



23-25 



23- 25 



23-25 



26 



27 



33343536 



37 



38 



39 



40 



41 



37 



42 



Sounding Data. 



54-55 



TABLE 1: 9xxx9 



91119 Altitude in feet 



92229 Altitude in meters 



93339 Pressure (mbs.) 



94449 Not assigned 



95559 Not assigned 



96669 Altitude in feet 



97779 Altitude in meters 



98889 Pressure (mbs.) 



99999 Not assigned 



RECCO Report 



without 



RADAR Data 



RECCO Report 

 with 

 RADAR Data 



TABLE 9: w 



Clear (no cloud at any level) 



1 Partly cloudy (scattered or broken) 



2 Continuous layer(s) of cloud(s) 



3 Sandstorm, duststorm, or storm of 



drifting snow 



4 Fog, thick dust, or haze 



5 Drizzle 



6 Rain 



7 Snow or rain and snow mixed 



8 Shower(s) 



9 Thunderstorm(s) 



TABLE 16: F 







Calm 



1 



1-3 knots 



2 



4-6 knots 



3 



7 - 10 knots 



4 



11 - 16 knots 



5 



17 - 21 knots 



8 



22 • 27 knots 



7 



28 - 33 knots 



8 



34 - 40 knots 



9 



41 - 47 knots 





or over* 



• 



See Note 30 



TABLE 2: i 

 u 



t., No humidity report 



T., Relative humidity 



t., Diff. between dry bulb and wet bulb temp. 



■C., Diff. between dry bulb and dew point temp. 



°C., Dew point 



TABLE 10 : m 



Light intermittent 



1 Light continuous 



2 Moderate intermittent 



3 Moderate continuous 



4 Heavy, Intermittent 



5 Heavy continuous 

 8 With rain 



7 With snow 



8 With hail 



9 No remarks 



TABLE 17: S 



Calm (glassy) 



Calm (rippled) ( • 



Smooth (wavelets) ( 1 - 



Slight 

 Moderate 

 Rough 

 Very rough 

 High 



Very high 

 Phenomenal * 



( 2 

 ( 4- 



lft.) 

 2 ft.) 

 4 ft.) 

 8 ft.) 



( 8 - 13 ft.) 

 (13 • 20 ft.) 

 (20 - 30 ft.) 

 (30 • 45 ft.) 

 (Over 45ft.) 



•As might exist at the center 

 of a hurricane 



TABLE 3: Y 



Sunday 



Monday 



Tuesday 



Wednesday 



Thursday 



Friday 



Saturday 



TABLE 4: Q 



0°- 



»0°W) 



90°- 



180° W 



180°- 



»0°E 



90° - 



0°E J 



0°- 



♦0' 



w ] 



90°- 



1|0< 



w 



180°- 



v0' 



E 



90°- 



o c 



E J 



North 

 Lati- 

 tude 



South 

 Lati- 

 tude 



Surface pressure in whole millibars, 



thousands figure omitted 



1 Altitude of 1 ,000 mb surface in geopotential 



meters; if negative add 500 



2 Altitude of 850 mb surface in geopotential 



meters; if negative add 500 



3 Altitude of 700 mb surface in geopotential 



meters 



4 Altitude of 500 mb surface in geopotential 



decameters 



5 Altitude of 300 mb surface in geopotential 



decameters 



TABLE 11: j 



TABLE 5: B 



None 



1 Light turbulence 



2 Mod. tur. in clear air, infrequent 



3 Mod. tur. in clear air, frequent 



4 Mod. tur. in cloud, infrequent 



5 Mod. tur. in cloud, frequent 



6 Severe tur. in clear air, infrequent 



7 Severe tur. in clear air, frequent 



8 Severe tur. in cloud, infrequent 



9 Severe tur. in cloud, frequent 



8 Altitude of 200 mb surface in geopotential 

 decameters 



7 Altitude oM00 mb surface in geopotential 



decameters 



8 True altitude (radio altimeter or other 



method) minus pressure altitude (set at 

 1,013 mb) in tens of feet; if negative add 

 500 to absolute value (e.g. -- (minus) 

 100 is reported as 600) 



9 Altimeter sub-scale reading in whole milli- 

 bars, thousands figure omitted 



TABLE 18: W g 



No change 



1 Marked wind shift 



2 Marked turbulence begins 



or ends 



3 Marked temperature change 



(not with altitude) 



4 Precipitation begins or ends 



5 Change in cloud forms 



6 Fog bank begins or ends 



7 Warm front 



8 Cold front 



9 Front, type not specified 



TABLE 19: S. 



^b 



No report 



Reported at previous position 



Occurring at preseat position 



20 nautical miles 



40 nautical miles 



60 nautical miles 



80 nautical miles 

 100 nautical miles 

 150 nautical miles 

 More than 150 nautical miles 



TABLE 6: fL 



Total amount of cloud less than 1/8 

 Total cloud amount at least 1/8, with either 18-48 

 above or 1/8 - 4/8 below, or combinations thereof 

 Cloud amount more than 4/8 above and 0-48 below 

 Cloud amount 0-4/8 above and more thar 4 8 below 

 Cloud amount more than 4/8 above and more than 4 8 below 

 Chaotic sky - many undefined layers 

 In and out of clouds, on instruments 25% of time 

 In and out of clouds, on instruments 50% of time 

 In and out of clouds, on instruments 75% of time 



9 In clouds all of the time, continuous instrument flight 



/ Impossible to determine due to darkness 



TABLE 12 : Nj,N 2 , Nj 



Zero 



1 1/10 or lsss, 



but not zero 



2 2/10 and 3/10 



3 4/10 



4 5/10 



5 6/10 



6 7/10 and 8/10 



7 9/10 or more, 



but not 10/10 



8 10/10 



9 Sky obscured, or cloud amount 



cannot be estimated 



Zero 



1 Okta or less 



but not zero 



Oktas 



Oktas 



Oktas 



Oktas 



Oktas 



Oktas or more, 

 but not 8 Oktas 



Oktas 



TABLE 20: W 

 c 



No report 



1 Signs of hurricane 



2 Ugly, threatening sky 



3 Duststorm or sandstorm 



4 Fog or ice fog 



5 Waterspout 



6 Cs cloud shield or bank 



7 As or Ac cloud shield 



or bank 



8 Line of heavy cumulus 



9 Cb heads or thunderstorms 



Spot wind 

 Winds averaged 

 Winds averaged 

 Winds averaged 

 Winds averaged 

 Winds averaged 



6 Winds averaged 



7 Winds averaged 



8 Winds averaged 



9 Winds averaged 



TABLE 7: dj 



over 100 naut. miles preceding last fix 

 over 200 naut. miles preceding last fix 

 over 300 naut. miles preceding last fix 

 over 400 naut. miles preceding last fix 

 over 100 naut. miles preceding last fix 

 over 200 naut. miles preceding last fix 

 over 300 naut. miles preceding last fix 

 over 400 naut. miles preceding last fix 

 over more than 400 nautical miles 



Last fix 



25 naut. miles 



prior to this 



position 



Last fix 



75 naut. miles 



prior to this 



position 



TABLE 13: C 



Cirrus (Ci) 



1 Clrrocumulus (Cc) 



2 Cirrostratus (Cs) 



3 Altocumulus (Ac) 



4 Altostratus (As) 



5 Nimbostratus (Ns) 



6 Stratocumulus (Sc) 



7 Stratus (St) or Fractostratus (Fs) 



8 Cumulus (Cu) or Fractocumulus (Fc) 



9 Cumulonimbus (Cb) 



/ Cloud not visible owing to darkness 

 fog, duststorm, sandstorm, or 

 other analogous phenomena 



TABLE 21: I f 



.1 In. or 2 mm. /minute 

 1^.1- .2 In. or 2- 5 mm. /minute 



2 .3 - .4 in. or 6 - 10 mm./minute 



3 .5 - .6 in. or 11 - 15 mm./minute 



4 .7 - .8 in. or 16 - 20 mm./minute 



5 .9 - 1.0 in. or 21 - 25 mm./minute 



6 Over 1.0 in. or 25 mm./minute 



7 Light 



8 Moderate 



9 Heavy 



TABLE 22: ^ 



None 



1 Rime ice in clouds 



2 Clear ice in clouds 



3 Combination rime and 



clear ice in clouds 



4 Rime ice in precipitation 



5 Clear ice in precipitation 



6 Combination rime and clear 



ice in precipitation 



7 Frost (icing in clear air) 



8 Non-persistent contrails 



9 Persistent contrails 



TABLE 14: hh, HH, hjhj, HjHj 



100 ft. 

 200 ft. 

 300 ft. 

 400 ft. 

 500 ft. 



(30 m) 



(60 m) 



(90 m) 



(120 m) 



(150 m) 



00 Less than 100 ft. (30 m) 



01 



02 



03 



04 



05 



etc. 



49 4,900 ft. (1,470 m) 



50 5,000 ft. (1,500 m) 



51 Not specified 

 etc. etc. 



55 Not specified 



56 6,000 ft. (1,800 m) 



57 



etc. 



78 



79 



80 



81 



82 



etc. 



87 



88 



89 



// 



7,000 ft. 



etc. 

 28,000 ft. 

 29,000 ft. 

 30,000 ft. 

 35,000 ft. 

 40,000 ft. 



etc. 

 65,000 ft. 

 70,000 ft. 

 Above 

 70,000 ft. 

 Unknown 



(2,100 m) 



(8,400 m) 



(8,700 m) 



(9,000 m) 



(10,500 m) 



(12,000 m) 



(19,500 m) 

 (21,000 m) 



(21,000 m) 



TABLE 23: O e 



Circular Area 



1 NNE - SSW 



2 NE - SW 

 ENE - WSW 



E - W 

 ESE - WNW 



SE - NW 

 SSE - NNW 



S-N 

 Uncertain 



TABLE 24: c. 



Not reported or 



indeterminate 

 Scattered 

 Solid 



Scattered line 

 Solid line 



Scattered, all quadrants 

 Solid, all quadrants 



TABLE 8: d 



a 



90% to 100% reliable 



1 75% to 100% reliable 



2 80% to 100% reliable 



3 75% to 90% reliable 



4 60% to P.0% reliable 



5 50% to 75% reliable 



6 Less than 50% reliable 



7 No reliability 



8 No wind 



9 Not used 

 (See Note 15) 



TABLE 15: D, Djj, D„ 



Calm or stationary (or 



at the station) 



1 NE 



2 E 



3 SE 



4 S 



5 SW 



6 W 



7 NW 



8 N 



9 All directions, no de- 



finite direction, or 

 unknown, or no 

 report 



TABLE 25: i. 



No report or unknown 

 Weak, decreasing 

 Weak, no change 

 Weak, increasing 

 Moderate, decreasing 

 Moderate, no change 



6 Moderate, increasing 



7 Strong, decreasing 



8 Strong, no change 



9 Strong, increasing 



NOTES 



General : 



1 • The code name RECCO Is used as a 

 prefix to the report, indicating 

 that it is a report from meteor- 

 ological reconnaissance flight. 



2. Present weather, cloud genera 

 and amounts, turbulence, and 

 surface data are reported for 

 a cylindrical portion of the 

 atmosphere approximately 30 

 nautical miles in radius with 

 the aircraft at the center at 

 the time of observation. The 

 lentgh of this cylinder extend* 

 from the earth's surface to the 

 top of the atmosphere. Weather 

 beyond the circumference of the 

 observation cylinder is reported 

 as off course weather. 



3. The use of Section 1 is MANDATOR? 

 and all the groups are always in- 

 cluded In the message. If datum 

 is not available for an element, 

 a solldus (/), or a code figure 

 if appropriate, is reported for 

 the element to Indicate missing. 



4. The use of Section 2 is OPTIONAL. 

 If Section 2 is used all of the 

 groups for which data are observed 

 shall be Included in the message. 

 The groups in Section 2 are self- 

 identifying; therefore, they can 

 be omitted from, included in, or 

 repeated (as required) in the 

 message without confusion. 



NOTES CONTINUED ON REVERSE 



301 12101 044 1 69-004 



FLD004000C0 



