FAQ - WeatherSentry® Web Services - Glossary of Terms

Version 8


    A value reported over a period of time which is typical for precipitation reporting.



    Average (avg) is found by dividing the sum of data by the number of items in the data set. It is also called the mean. For example; the average daily temperature is calculated by dividing the sum of the 24 hourly temperatures by 24.


    Calendar Day

    A calendar day refers to the time period of midnight to 11:59pm local time.



    Data is updated each day at a specific time. The time of day may vary by data type or provider or in reference to a data value represented for a 24 hour period, typically a calendar day.


    Dew Point

    The absolute temperature at which air can no longer hold all of its water vapor, causing condensation into liquid water.



    Eddy Dissipation Rate (EDR) is a measurement of turbulent energy as it affects airframes in airspace.  An ICAO standard for measuring turbulence in the aviation industry



    Forecast (Fcst) is a prediction of the weather through application of the principles of physics and meteorology.


    Feels Like

    The current heat index if over 70°F (21°C) or wind chill if below 50°F (10°C).



    Global, as used when referring to weather data, is data which is gathered from and available to the entire world; worldwide.



    Traditionally, weather observations have been reported on or near the top-of-the-hour. The end-of-the-hour is the typical reporting method for precipitation amounts.



    A value reported for a specific time, the typical reporting method for temperatures.



    Maximum (Max) is the largest or highest value of a data set. For example; the maximum daily temperature refers to the highest temperature value recorded within a calendar day.



    Minimum (Min) is the smallest or lowest value of a data set. For example; the minimum daily temperature refers to the lowest temperature value recorded within a calendar day.



    The Meteorological Assimilation Data Ingest System (MADIS) ingests data files from NOAA data sources and non-NOAA data providers, decodes the data and then encodes all of the observational data into a common format with uniform observation units and time stamps. Quality control checks are conducted and the integrated data sets are stored in the MADIS database with a series of flags indicating the quality of the observation from a variety of perspectives.



    The National Oceanic and Atmospheric Administration (NOAA) is a United States federal agency focused on the condition of the oceans and the atmosphere.



    Normals are the average value of a specific data type over a given timeframe. In this document, Normals refer to a 10 year period.



    The National Weather Service (NWS) of the United States is a division of NOAA.



    Observation (Obs) is an evaluation of one or more meteorological elements that describe the state of the atmosphere either at the earth's surface or aloft.



    A year (yr) is a period of 365 days (or 366 days during leap years).


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