![]() ![]() Codes 90 to 99 are used for shipboard observations, from "90" for less than 1 ⁄ 16 mile visibility, "95" for 1 mile, "99" for greater than 30 miles. ![]() Code 89 indicates visibility greater than 70 km Codes 81 to 88 indicate visibility in a multiple of 5 km "81" for 35 km, "88" for 70 km.For codes 56 to 80, 50 is subtracted, and the resulting number indicates visibility in kilometers, for example "66" means 16 km.For codes 00 to 50, this indicates visibility in tenths of a kilometer ( hectometers), for example "15" means 1.5 km.VV indicates horizontal surface visibility:.h indicates the height above the surface for the base of the lowest cloud seen: 0 means from 0 to 100 feet or 0 to 50 meters, 9 means the base of clouds is 2500 meters or higher or that there are no clouds.i X is a code number indicating the manner of station operation, and the format used in group 7wwWW codes 1, 2 and 3 indicate a manned station, while codes 4 to 7 indicate an automatic station.This is a code number from 0 to 4, with 0, 1 and 2 meaning data is included, and 3 and 4 indicationg no precipitation data. i R indicates whether precipitation data is included or omitted.(For example, 02993 is the code of the weather station on Märket, 74794 of Cape Canaveral). IIiii: weather station identification code II for a block number allocated (by the WMO) to a country or a region of the world, for example 02 for Scandinavia or 72 and 74 for the continental US iii is the code of an individual station within a block.YYGGi w: the date and time of the observation YY for the day of the month, GG for the hour of the observation in UTC i w for the manner of wind observation (a code number: 0 for estimated wind speed in meters per second, 1 for measured wind speed in meters per second, 2 and 3 likewise but in knots, or slash for no wind speed observations).YYGGi w IIiii i Ri XhVV Nddff (00fff) 1s nTTT 2s nT dT dT d 3P oP oP oP o 4PPPP 5appp 6RRRt R 7wwW 1W 2 8N hC LC MC H (9GGgg) Messages from shipboard weather stations, and in different regions of the world, use variations on this scheme. Leading numbers are fixed group indicators that indicate the type of observation following, and letters are replaced with numbers giving the weather data. The message consists of a sequence of numeric groups, which may also contain slashes (indicating missing data) in addition to numeric digits. Message formatįollowing is the general structure of a SYNOP message. The format of the original messages is abbreviated, some items are coded. SYNOP information is collected by more than 7600 manned and unmanned meteorological stations and more than 2500 mobile stations around the world and is used for weather forecasting and climatic statistics. It can be decoded by open-source software such as seaTTY, metaf2xml or Fldigi. A report consists of groups of numbers (and slashes where data is not available) describing general weather information, such as the temperature, barometric pressure and visibility at a weather station. SYNOP reports are typically sent every six hours by Deutscher Wetterdienst on shortwave and low frequency using RTTY. SYNOP ( surface synoptic observations) is a numerical code (called FM-12 by WMO) used for reporting weather observations made by manned and automated weather stations. JSTOR ( June 2019) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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