1) B10 10-degree box OPCON : input = Lat, Long (a): Convert Lat and Long to B10 by the uniform convention. 2) YR year OPCON : input = Year (bits 41-47) (a): Add 1900 to the input. 3) MO month OPCON : input = Month (bits 37-40) 4) DY day OPCON : input = Day (bits 32-36) 5) HR hour OPCON : input = Hour (bits 27-31) (a): Change the input from ones to hundredths. 6) TI time indicator OPCON : input = no corresponding field (a): If the input of Hour (above field) is not missing, set TI = 0 (nearest whole hour). 7) LON longitude OPCON : input = Long (word 1, bits 24-35) (a): Convert west (-0 to -180) and east (0 to 180) Long to LON. (b): Change the input from tenths to hundredths. 8) LAT latitude OPCON : input = Lat (word 1, bits 36-46) (a): Change the input from tenths to hundredths. 9) LI lat/lon indicator OPCON : input = no corresponding field (a): Set LI = 0 (degrees and tenths). 10) DCK deck OPCON : input = no corresponding field (a): Set DCK = 555 (Monterey Telecommunications). 11) SID source ID OPCON : input = no corresponding field (a): Set SID = 80 (US Navy FNMOC Monterey Telecom: NCAR: Kunia (OPCON) format). 12) PT platform type OPCON : input = no corresponding field 13) QI quality indicator OPCON : input = no corresponding field 14) DS dup status OPCON : input = no corresponding field 15) DC dup check OPCON : input = no corresponding field 16) TC track check OPCON : input = no corresponding field 17) PB pressure bias OPCON : input = no corresponding field 18) DI wind direction indicator OPCON : input = no corresponding field (a): If the input of wind direction (next field) is not missing, set DI = 0 (36-point compass). 19) D wind direction OPCON : input = DD (word 4, bits 12-18) (a): Change the input from tens to ones. (b): If the input equals 0, set D = 361 (calm). If the input equals 990, set D = 362 (variable). 20) WI wind speed indicator OPCON : input = no corresponding field 21) W wind speed OPCON : input = FF (word 4, bits 4-11) (a): Change the input from ones to tenths. 22) VI visibility indicator OPCON : input = no corresponding field 23) VV visibility OPCON : input = VV (word 5, bits 4-8) (a): Add 90 to the input. 24) WW present weather OPCON : input = WW (word 5, bits 9-16) 25) W1 past weather OPCON : input = W (word 5, bits 42-46) 26) W2 second past weather OPCON : input = no corresponding field 27) SLP sea level pressure OPCON : input = PPP (word 2, bits 1-11) (a): Add 1000 to the input. 28) T1 temperature indicator OPCON : input = no corresponding field (a): Set T1 = 0 (degrees Celsius and tenths). 29) AT air temperature OPCON : input = TT (word 2, bits 0-0), (word 3, bits 38-47) 30) WBT wet bulb temperature OPCON : input = no corresponding field 31) DPT dew point temperature OPCON : input = Td (word 3, bits 16-26) 32) SST sea surface temperature OPCON : input = Ta-Ts (word 3, bits 27-37) (a): If AT is not missing subtract the input from AT. 33) SI sea surface temperature method indicator OPCON : input = no corresponding field 34) N total cloud amount OPCON : input = N (word 4, bits 0-3), (word 5, bits 47-47) 35) NH lower cloud amount OPCON : input = Nh (word 5, bits 37-41) 36) CL low cloud type OPCON : input = CL (word 5, bits 32-36) 37) HI cloud height indicator OPCON : input = no corresponding field 38) H cloud height OPCON : input = H (word 5, bits 17-21) 39) CM middle cloud type OPCON : input = Cm (word 5, bits 27-31) 40) CH high cloud type OPCON : input = Ch (word 5, bits 22-26) 41) WD wave direction OPCON : input = Dw (word 4, bits 36-42) (a): If the input equals 50-86, subtract 50 from the input. If the input equals 49, set WD = 37. If the input equals 99, set WD = 38. 42) WP wave period OPCON : input = Pw (word 3, bits 0-4) (a): Map Pw to WP as follows: Pw WP 2 5 = 5 seconds or less 3 7 = 6-7 seconds 4 9 = 8-9 seconds 5 11 = 10-11 seconds 6 13 = 12-13 seconds 7 15 = 14-15 seconds 8 17 = 16-17 seconds 9 19 = 18-19 seconds 0 21 = 20-21 seconds 1 22 = over 21 seconds 43) WH wave height OPCON : input = Hw (word 4, bits 43-47) (a): If the input of WD (field 41) equals 50-86, add 10 to the input. (b): Convert the input from half meters to meters. [3] 44) SD swell direction OPCON : input = Ds (word 4, bits 19-25) (a): Follow the same procedure as WD (field 41). 45) SP swell period OPCON : input = Ps (word 4, bits 31-35) (a): Map Ps to SP as follows: Prior to 1968, follow the same procedure as WP (field 42). Beginning in 1968 Ps SP 0 10 = 10 seconds 1 11 = 11 seconds 2 12 = 12 seconds 3 13 = 13 seconds 4 14 = 14 seconds or more 5 5 = 5 seconds or less 6 6 = 6 seconds 7 7 = 7 seconds 8 8 = 8 seconds 9 9 = 9 seconds 46) SH swell height OPCON : input = Hs (word 4, bits 26-30) (a): Follow the same procedure as WH (field 43). 47) C1 country code OPCON : input = no corresponding field 48) C2 second country code OPCON : input = no corresponding field 49) SC ship course OPCON : input = Ship direction (word 2, bits 17-21) 50) SS ship speed OPCON : input = Velocity (word 2, bits 12-16) (a): Do not convert the input from knots/3. [Note: The input was perhaps erroneously assumed to be a coded value.] 51) A barometric tendency OPCON : input = no corresponding field (a): If the input of PPP is greater than 0, set A = 2. If the input of PPP equals 0, set A = 4. If the input of PPP is less than 0, set A = 7. 52) PPP amount of SLP change OPCON : input = APP (word 3, bits 5-15) (a): Change the input to its absolute value. 53) IS ice accretion OPCON : input = no corresponding field 54) ES ice thickness OPCON : input = no corresponding field 55) RS ice accretion rate OPCON : input = no corresponding field 56) II ID indicator OPCON : input = no corresponding field 57-64) ID(8) ID/call sign OPCON : input = call sign (word 1, bits 0-23), (word 2, bits 24-47) (a): Change the input from BCD. (b): Change leading colons to missing. 65) OS observation source OPCON : input = no corresponding field 66) OP observation platform OPCON : input = no corresponding field 67) T2 second temperature indicator OPCON : input = no corresponding field 68) IX station/weather indicator OPCON : input = no corresponding field 69) WX wave period indicator OPCON : input = no corresponding field (a): If the input of WP is not missing, set WX = 1. 70) SX swell period indicator OPCON : input = no corresponding field (a): If the input of SP is not missing, set SX = 1. 71) IRD IMM receipt date OPCON : input = no corresponding field 72) A6 allowance 6 flag OPCON : input = no corresponding field {3. Contents of supplemental attachment (Attm4)} OPCON : input = S (word 1, bits 47-47), C (word 2, bits 22-23), Unused (word 5, bits 0-3) The 7 bits are left justified in 1 byte.