15-1.     Introduction

15-2.     Definitions

15-3.     Aviation Weather Reports Code

Figure 15-1.     Content of METAR/SPECI

15-4.     Format and Content of the METAR/SPECI Report

Figure 15-2.     METAR or SPECI Code Format

15-5.     Coding Missing Data in METAR and SPECI Reports

15-6.     Coding the Body of the METAR or SPECI Report

15-7.     Type of Report (METAR or SPECI)

15-8.     Station Identifier (CCCC)

15-9.     Date and Time of Report (YYGGggZ)

15-10.   Report Modifier (AUTO or COR)

15-11.   Wind Group ((dddff(f)Gf_mf_m(f_m)KT)_(d_nd_nd_nVd_xd_xd_x)

15-12.   Visibility Group (VVVVVSM)

Figure 15-3.     Reportable Visibility Values

15-13.   Runway Visual Range Group (RD_RD_R/V_RV_RV_RV_RFT) or
              (RD_RD_R/V_nV_nV_nV_nVV_xV_xV_xV_xFT) (NA LAWRS)

15-14.   Present Weather Group (w'w')

Figure 15-4.     Present Weather

15-15.   Sky Condition Group (N_sN_sN_sh_sh_sh_s or VVh_sh_sh_s or CLR or SKC)

Figure 15-5.     Reportable Values for Sky Cover Amount

Figure 15-6.     Increments of Reportable Values of Sky Cover Height

15-16.   Temperature/Dew Point Group (T'T'/T'_dT'_d)

15-17.   Altimeter (AP_HP_HP_HP_H)

15-18.   Remarks (RMK)

15-19.   Automated, Manual, and Plain Language Remarks

15-20.   Volcanic Eruptions

15-21.   Funnel Cloud (Tornadic Activity_B/E(hh)mm_LOC/DIR_(MOV))

15-22.   Type of Automated Station (AO1 or AO2)

15-23.   Peak Wind (PK WND_dddff(f)/(hh)mm) (NA LAWRS)

15-24.   Wind Shift (WSHFT_(hh)mm)

15-25.   Tower or Surface Visibility (TWR_VIS_vvvvv or SFC_VIS_vvvvv)

15-26.   Variable Prevailing Visibility (VIS_V_nv_nv_nv_nv_nVv_xv_xv_xv_xv_x)

15-27.   Sector Visibility (VIS_[DIR]_vvvvv)

15-28.   Visibility at Second Location ((VIS)_vvvvv_[LOC]) (NA LAWRS)

15-29.   Lightning Frequency (Frequency_LTG(Type)_[LOC])

Figure 15-7.     Type and Frequency of Lightning

15-30.   Beginning and Ending of Precipitation (w'w'B(hh)mmE(hh)mm) (NA LAWRS)

15-31.   Beginning and Ending of Thunderstorms (TSB(hh)mmE(hh)mm)

15-32.   Thunderstorm Location (TS_LOC_(MOV_DIR))

15-33.   Hailstone Size (GR_[size])

15-34.   Virga (VIRGA_(DIR))

15-35.   Variable Ceiling Height (CIG_h_nh_nh_nVh_xh_xh_x)

15-36.   Obscuration (w'w'_[N_sN_sN_s]h_sh_sh_s)

15-37.   Variable Sky Condition (N_sN_sN_s(h_sh_sh_s) _V_N_sN_sN_s)

15-38.   Significant Cloud Type [Plain Language]

15-39.   Ceiling Height at Second Location (CIG_hhh_[LOC]) (NA LAWRS)

15-40.   Pressure Rising or Falling Rapidly (PRESRR OR PRESFR) (NA LAWRS)

15-41.   Sea-Level Pressure (SLPppp) (NA LAWRS)

15-42.   Aircraft Mishap (ACFT_MSHP)

15-43.   No SPECI Reports Taken (NOSPECI)

15-44.   Snow Increasing Rapidly (SNINCR_(inches-hour/inches on ground)) (NA LAWRS)

15-45.   Other Significant Information

15-46.   Additive and Automated Maintenance Data

Figure 15-8.     Units of Measure for Precipitation

15-47.   Hourly Precipitation Amount (Prrrr) (NA LAWRS)

15-48.   1, 3 and 6 Hourly Ice Accretion Amounts (I1nnn, I3nnn, I6nnn) (NA LAWRS)

15-49.   3- and 6-Hour Precipitation Amount (6RRRR) (NA LAWRS)

15-50.   24-Hour Precipitation Amount (7R₂₄R₂₄R₂₄R₂₄) (NA LAWRS)

15-51.   Snow Depth on Ground (4/sss) (NA LAWRS)

15-52.   Water Equivalent of Snow on Ground (933RRR) (NA LAWRS)

15-53.   Cloud Types (8/C_LC_MC_H) (NA LAWRS)

15-54.   Duration of Sunshine (98mmm) (NA LAWRS)

15-55.   Hourly Temperature and Dew Point (Ts_nT'T'T's_nT'_dT'_dT'_d) (NA LAWRS)

15-56.   6-Hourly Maximum Temperature (1s_nT_xT_xT_x) (NA LAWRS)

15-57.   6-Hourly Minimum Temperature (2s_nT_nT_nT_n) (NA LAWRS)

15-58.   24-Hour Maximum and Minimum Temperature (4s_nT_xT_xT_xs_nT_nT_nT_n) (NA LAWRS)

15-59.   3-Hourly Pressure Tendency (5appp) (NA LAWRS)

Figure 15-9.     Characteristics of Barometer Tendency

Figure 15-10.   3-Hour Change in Pressure

15-60.   Sensor Status Indicators

15-61.   Maintenance Indicator

15-62.   Transmission Times