SE.ACMF Meteorological observations - Significant clouds, hourly values

Description

Purpose: Describes the current weather and, over time, the climate. Basis for forecast verification. Unit: Cloud amount in eighths, cloud base in meters. Characteristics: Cloud base and cloud quantity are reported at one hour intervals from several official stations equipped with cloud altimeters. Cloud quantity and cloud base are determined by an advanced algorithm in the measuring instrument. Most measuring stations send automatically generated reports. All cloud layers detected by the instrument are reported, but no more than 4 cloud layers are reported. For manual stations, the following clouds are reported: - Lowest cloud layer regardless of its cloud quantity, to be reported at least 1/8. - Next, higher layers of cloud covering a total of 3/8 or more of the sky. - Next, higher layers of cloud covering a total of 5/8 or more of the sky. Cumulonimbus clouds not reported in accordance with points 1, 2 or 3 are always reported in a separate group regardless of the amount of cloud. Today's measuring instruments cannot distinguish such clouds. - Cloud base for each cloud layer is reported. Ex:1/8 on 300 m, 3/8 on 500 m and 5/8 on 1000 m. Cloud quantity is reported from 0/8 (cloudless) to 8/8 (mulet). 9/8 means that the cloudy sky cannot be observed due to fog or high snow drift. At 9/8, the term vertical visibility is used, which indicates how far vertically it is possible to see. Cloud quantity - Data is available with values 0 to 9. Values 10 to 15 are empty; reserved for aerodrome observations not included in this dataset. - Value 0 to 8 means 0 to 8 eighths, 9/8 refers to vertical visibility. Parameter 29 - Minimum cloud layer instantaneous value 1 time per hour - Cloud quantity, lowest cloud quantity regardless of cloud quantity. Parameter 31 - Other cloud layers instantaneous value 1 time per hour - Cloud quantity, next higher (second) cloud layer. Parameter 33 - Third cloud layer instantaneous value 1 time per hour - Cloud quantity, next higher (third) cloud layer. Parameter 35 - Fourth cloud layer instantaneous value 1 time per hour - Cloud quantity, next higher (fourth) cloud layer. Cloud base - Cloud base refers to the vertical distance from the ground to the underside of the clouds. Parameter 28 - Cloud base, lowest cloud layer instantaneous value, 1 time per hour - Cloud base, lowest cloud layer regardless of cloud amount. The amount of these clouds can be found under parameter 29.   Parameter 30 - Cloud base, second cloud layer instantaneous value, 1 time per hour - Cloud base, next higher (second) cloud layer. The amount of these clouds can be found under parameter 31. Parameter 32 - Cloud base, 3rd cloud layer instantaneous value, 1 time per hour - Cloud base, next higher (third) cloud layer. The amount of these clouds can be found under parameter 33. Parameter 34 - Cloud base, fourth cloud layer instantaneous value, 1 time per hour - Cloud base, next higher (fourth) cloud layer. The amount of these clouds can be found under parameter 34. - Cumulonimbus cloud base (CB) not reported in other cloud layers. CB cannot be distinguished by automatic instruments, these data are mainly found in historical observations that were manual. Network information: - SMHI's station network: Data is collected and stored in SMHI's databases. Data quality is checked, which means that incorrect data is corrected and that data loss is supplemented based on expert judgement where possible. Most of the stations are continuously monitored, inspected and maintained by SMHI. - Other stations: Data is collected and stored in SMHI's databases. The data quality is unknown to SMHI as SMHI does not perform quality control on data or inspections at the stations. Quality codes: Green values (G) mean approved quality. Yellow values (Y) mean data that may be suspiciously inaccurate. It can also be an aggregated value based on other metrics. Boundaries: 0 to 7500 m (cloud base), 0 to 9 (cloud amount) For more info see: https://www.smhi.se/Knowledge Bank/Cloud and Cloud Management-1.1514

Resources

Name Format Description Link
0 https://opendata-download-metobs.smhi.se/api/version/latest/parameter/32.json
0 https://www.smhi.se/data/hitta-data-for-en-plats/ladda-ner-vaderobservationer/sigfnificantClouds
0 https://opendata-download-metobs.smhi.se/api/version/latest/parameter/28.json
0 https://opendata-download-metobs.smhi.se/api/version/latest/parameter/30.json
0 https://opendata-download-metobs.smhi.se/api/version/latest/parameter/29.json
0 https://opendata-download-metobs.smhi.se/api/version/latest/parameter/34.json
0 https://opendata-download-metobs.smhi.se/api/version/latest/parameter/31.json
0 https://opendata-download-metobs.smhi.se/api/version/latest/parameter/35.json
0 https://opendata-download-metobs.smhi.se/api/version/latest/parameter/33.json
0 https://opendata-view.smhi.se/met-obs/ACMF.signifikanta_moln_lager_1_till_4_timme_view/wms?service=wms&request=getcapabilities

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  • ENVI

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