of a hectopascal, derived from station pressure. 5appp: three-hour pressure tendency. The digit a encodes the manner of pressure change, for example "3" means "decreasing or steady, then increasing; or increasing, then increasing more rapidly". Codes 1 to 3 indicate higher pressure than 3 hours ago, codes 6 to 8 indicate lower pressure, while codes 0, 4 and 5 indicate approximately the same pressure. Digits ppp indicate the actual pressure change, in tenths of a hectopascal. 6RRRtR: amount of precipitation, in millimeters. Digit tR indicates the length of time covered by this group, such as a measurement over the past 6, 12, 18 or 24 hours. 7wwW1W2: present (ww) and past (W1W2) weather. Manned and automatic stations use different formats and tables for this group. These are looked up from a table, with various different codes, such as "35" for "severe duststorm or sandstorm, has begun or has increased during the preceding hour". 8NhCLCMCH: cloud types. Nh indicates amount of low-altitude clouds (in oktas, like in the Nddff group), or if none, the amount of medium-altitude clouds. CL, CM and CH indicate the types of low, medium, and high-altitude clouds present, with codes looked up from tables. 9GGgg: actual time of observation, in hours and minutes UTC, used when the actual time differs more than 10 minutes from the time reported in the YYGGiw group. After this first section, stations may include additional sections, prefixed by 222// (section 2, for manned coastal stations, reporting sea surface temperature and wave data), 333 (section 3, used only in some areas of the world, for the "state of the sky in the tropics"), or 555 (various national code groups). Example message This observation was from April 1, 2022, from LaGuardia Airport in New York City. 01124 72503 12566 63015 10106 20050 30003 40016 53048 60071 91151 333 10178 20106 70079 91021 01124: First day of the month (01), 12:00 UTC (12), with wind speed in knots, measured by anemometer (4). 72503: The station's WMO index, New York, La Guardia Airport. 12566: Precipitation data is included in section 1 (1), station is manned (2), past weather observations (group 7wwW1W2) not included (2), base of lowest observed cloud is from 600 to 999 m (5), horizontal visibility at surface 16 km (66). 63015: Total cloud cover of the sky (6), wind direction is between 295° and 304° (30), wind speed 15 knots (15). 10106: Temperature