Global Surface Summary of the Day - GSOD
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dateStamp: 2023-08-03
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title: Global Surface Summary of the Day - GSOD
alternateTitle: Global Summary of the Day
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abstract: Global Surface Summary of the Day is derived from The Integrated Surface Hourly (ISH) dataset. The ISH dataset includes global data obtained from the USAF Climatology Center, located in the Federal Climate Complex with NCDC. The latest daily summary data are normally available 1-2 days after the date-time of the observations used in the daily summaries. The online data files begin with 1929 and are at the time of this writing at the Version 8 software level. Over 9000 stations' data are typically available. The daily elements included in the dataset (as available from each station) are: Mean temperature (.1 Fahrenheit) Mean dew point (.1 Fahrenheit) Mean sea level pressure (.1 mb) Mean station pressure (.1 mb) Mean visibility (.1 miles) Mean wind speed (.1 knots) Maximum sustained wind speed (.1 knots) Maximum wind gust (.1 knots) Maximum temperature (.1 Fahrenheit) Minimum temperature (.1 Fahrenheit) Precipitation amount (.01 inches) Snow depth (.1 inches) Indicator for occurrence of: Fog, Rain or Drizzle, Snow or Ice Pellets, Hail, Thunder, Tornado/Funnel Cloud Global summary of day data for 18 surface meteorological elements are derived from the synoptic/hourly observations contained in USAF DATSAV3 Surface data and Federal Climate Complex Integrated Surface Hourly (ISH). Historical data are generally available for 1929 to the present, with data from 1973 to the present being the most complete. For some periods, one or more countries' data may not be available due to data restrictions or communications problems. In deriving the summary of day data, a minimum of 4 observations for the day must be present (allows for stations which report 4 synoptic observations/day). Since the data are converted to constant units (e.g, knots), slight rounding error from the originally reported values may occur (e.g, 9.9 instead of 10.0). The mean daily values described below are based on the hours of operation for the station. For some stations/countries, the visibility will sometimes 'cluster' around a value (such as 10 miles) due to the practice of not reporting visibilities greater than certain distances. The daily extremes and totals--maximum wind gust, precipitation amount, and snow depth--will only appear if the station reports the data sufficiently to provide a valid value. Therefore, these three elements will appear less frequently than other values. Also, these elements are derived from the stations' reports during the day, and may comprise a 24-hour period which includes a portion of the previous day. The data are reported and summarized based on Greenwich Mean Time (GMT, 0000Z - 2359Z) since the original synoptic/hourly data are reported and based on GMT.
purpose: Global summary of the day is comprised of a dozen daily averages computed from global hourly station data. Daily weather elements include mean values of: temperature, dew point temperature, sea level pressure, station pressure, visibility, and wind speed plus maximum and minimum temperature, maximum sustained wind speed and maximum gust, precipitation amount, snow depth, and weather indicators. With the exception of U.S. stations, 24-hour periods are based upon UTC times. Values are usually delayed 24-48 hours from the time of observation.
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fileName: https://www.ncei.noaa.gov/pub/data/metadata/images/C00516_global-day-summary.png
fileDescription: Global Surface Summary of the Day GIS map
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keyword: Earth Science > Atmosphere > Air Quality > Visibility
keyword: Earth Science > Atmosphere > Atmospheric Electricity > Lightning
keyword: Earth Science > Atmosphere > Weather Events > Tropical Cyclones
keyword: Earth Science > Atmosphere > Weather Events > Fog
keyword: Earth Science > Atmosphere > Weather Events > Lightning
keyword: Earth Science > Atmosphere > Weather Events > Rain Storms
keyword: Earth Science > Atmosphere > Atmospheric Phenomena > Tornadoes
keyword: Earth Science > Atmosphere > Atmospheric Pressure > Atmospheric Pressure Measurements
keyword: Earth Science > Atmosphere > Atmospheric Pressure > Sea Level Pressure
keyword: Earth Science > Atmosphere > Atmospheric Pressure > Surface Pressure
keyword: Earth Science > Atmosphere > Atmospheric Temperature > Surface Temperature > Air Temperature
keyword: Earth Science > Atmosphere > Atmospheric Temperature > Surface Temperature > Maximum/Minimum Temperature
keyword: Earth Science > Atmosphere > Atmospheric Temperature > Dew Point Temperature
keyword: Earth Science > Atmosphere > Atmospheric Winds > Surface Winds
keyword: Earth Science > Atmosphere > Precipitation > Liquid Precipitation > Rain > Freezing Rain
keyword: Earth Science > Atmosphere > Precipitation > Solid Precipitation > Hail
keyword: Earth Science > Atmosphere > Precipitation > Precipitation Amount
keyword: Earth Science > Atmosphere > Precipitation > Liquid Precipitation > Rain
keyword: Earth Science > Atmosphere > Precipitation > Solid Precipitation > Ice Pellets > Sleet
keyword: Earth Science > Atmosphere > Precipitation > Solid Precipitation > Snow
keyword: Earth Science > Cryosphere > Snow/Ice > Snow Depth
keyword: Earth Science > Terrestrial Hydrosphere > Snow/Ice > Snow Depth
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beginPosition: 1929-01-01
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statement: The Global Summary of the Day is a subset from the Integrated Surface Hourly dataset (DSI-3505) that allow for "on-the-fly" calculations for users.
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maintenanceNote: Bulk metadata change applied on 2023-07-06. See version control repository history for metadata change details.
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