We collected information about Main Synoptic Hours for you. Follow the liks to find out everything about Main Synoptic Hours.
https://nsidc.org/cryosphere/glossary/term/synoptic-hour#:~:text=hour%20%28UTC%20-%20Coordinated%20Universal%20Time%29%20determined%20by,are%20every%20six%20hours%2C%20commencing%20at%2000%3A00%20UTC.
https://nsidc.org/cryosphere/glossary/term/synoptic-hour
synoptic hour hour (UTC - Coordinated Universal Time) determined by international agreement at which meteorological observations are made simultaneously throughout the world; the primary synoptic hours are every six hours, commencing at 00:00 UTC.
https://glosbe.com/en/en/synoptic%20hour
S3980 Synoptic observation A surface or upper-air observation made at a synoptic hour. Precipitation forecasts tend to be bound by synoptic hours such as 0000, 0600, 1200 and 1800 GMT. Enter the vapour pressure in hectopascals and tenths for …
http://www.australianweathernews.com/sitepages/charts/Chart%20Update%20Times.html
They are based on SYNOP (synoptic) reports, are each updated several times so as to capture late-arriving data, and are archived for one month. They are available every 3 hours for Australia and every 6 hours for the rest of the world. In all of the world apart from Australia, the "main synoptic hours" are 00, 06, 12 and 18UTC.
https://www.ias.ac.in/article/fulltext/jess/104/02/0189-0220
taken daily from each station at main synoptic hours using optical theodolite. (b) Radiosonde/radiowind (RS/R W) observatories: The RS/RW observational network comprises 34 radiosonde/radiowind stations and one radiosonde station (figure 2). Two observations per day are taken from these stations at 0000 and 1200 GMT. ...
https://met.nps.edu/~bcreasey/mr3222/files/helpful/DecodeShipObservationCode.pdf
of three or six hours and will be different code figures. See code table 4561 of the land station synoptic code. For primary reports sent at the main synoptic times, the past weather covers the last six hours. For intermediate synoptic reports, the period covers the last three hours.
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