Table 3-6.—Synoptic Reporting Times for Maximum and Minimum Temperatures for U.S. Stations in WMO Regions IV and V REPORT WMO REGION REPORTED INFORMATION 0000Z IV only T_XT_XT_Xfor past 12 hours and T_nT_nT_n for past 18 hours. 0600Z V only IV only T_nT_nT_n for past 24 hours. T_XT_XT_X for past 24 hours and T_nT_nT_n for past 24 hours. 1200Z 1800Z IV only V only IV only T_XT_XT_X for previous calendar day ending 2400 LST, and T_nT_nT_n for past 12 hours . T_XT_XT_X past 24 hours. T_XT_XT_X for past 12 hours and T_nT_nT_n for past 18 hours . STATE OF THE GROUND WITHOUT SNOW OR ICE.—3Ejjj. The E is the state of the ground (WMO code table 0901), and jjj is regional information. (Group is not reported in WMO Region IV.) SNOW OR ICE ON THE GROUND.—4E'sss. The E' is state of snow or ice covering the ground (WMO code table 0975) and is reported in WMO Region IV as /. The sss is the average snow/ice depth in hundreds, tens, and units of centimeters. SUPPLEMENTARY   INFORMATION.— 5j₁j₂j₃j₄. The j₁ is the information designator (WMO code table 2061), while j₂j₃j₄ and, if necessary, the following  group,  j₅j₆j₇j₈j₉,  contains  the  coded information. Cloud Movement.—56j₂j₃j₄. In WMO Region V, U.S. stations use this group to report cloud movement pertaining to the clouds reported in the 8NhCLCMCH group  for  the  low-,  mid-, and high-etage clouds, respectively,  and  is  not  reported  in  Region  IV. 24-Hour Pressure Tendency.—The   58p₂₄p₂₄p₂₄ group is used to report a net increase or no net change in the 24-hour pressure tendency in tens, units and tenths of hPa. The 59p₂₄p₂₄p₂₄ group is used to report a net decrease  in  the  24-hour  pressure  tendency.  The  24-hour tendency is reported only in each of the main synoptic reports in the southern part of Region IV instead of the 5appp group in section 1. In Region V, U.S. stations report the 5appp group but additionally report the 24- hour  tendency  at  0000Z  and  1200Z. PRECIPITATION TOTAL.—6RRRt_R If this group is not previously reported in section 1, some regions report this group in the supplemental data section. 2 4 - H O U R P R E C I P I T A T I O N .— 7R₂₄R₂₄R₂₄R₂₄. This group is included in all synoptic reports  in  Region  IV  unless  no  precipitation  was received. The R₂₄R₂₄R₂₄R₂₄ is the 24-hour total liquid equivalent precipitation in hundreds, tens, units, and tenths of millimeters. A trace (<0.005 inch or <0.05 millimeter) is encoded 9999. CLOUD LAYER DATA.—8N_SCh_Sh_S.  This  group reports the amount, predominant type, and height of cloud in a layer, and may be used four times to report four individual layers. The N_S is the amount of cloud in oktas, the C is the predominant cloud type (WMO code table 0500), and h_Sh_S is the height of the cloud base (WMO code table 1677). This group is used by select stations in WMO Region IV. SPECIAL  INFORMATION.—9S_PS_PS_pS_p.   This group may be used to report special information in the International  code,  as  selected  by  regional  decision. The S_PS_P indicates the type of data (WMO code table 3778) while the S_pS_p is the specific data. This group is not generally used in Region IV or by U.S. stations in Region V. Regional Mountain Station Data Indicated by the group 444, section 4 of the report contains information generally reporting clouds with bases below the station level (mountain stations). All data other than N'C'H'H'C_t is in regionally decided code. The International code N'C'H'H'C_t is described by WMO code tables 2700, 0500, and 0552 for N’, C’, and C_t, with H'H' the top of the cloud mass in hundreds of meters. It is not generally in use in Region IV or by U.S. stations in Region V. 3-15