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Usage Notes
General
All Wind directions are relative to True North.
The wind, temperature, pressure and humidity plots were developed by Daniel Servranckx using the
Highcharts library. Features of Highcharts include the ability to display conditions at any given time by hovering your cursor over the chart, and the ability to highlight or de-select certain properties by clicking on that property on the chart's legend. Highcharts is a commercially-available charting library available at no charge for not-for-profit organizations like NSC.
Weather Station Data
The NSC's weather station sensor uploads a block of data every 5 minutes to the Davis Weatherlink Cloud Storage through a small device connected to the internet via the office router. Every 5 minutes starting on the hour, the NSC web server downloads a block of "current" data from the WeatherLink Network and stores the time, wind, temperature, humidity and pressure values in a running 6-hour file. When you open or reload this page, the 6-hour file is downloaded by your web client and processed to generate the charts below. To update the charts, reload the page.
The data on the Weatherlink Network is also available to other weather websites, including Weatherlink,
Weather Underground and
CWOP. The graphic immediately below is from the Davis Weatherlink site, and shows current conditions, daily high & low temperatures, daily peak winds, and daily and seasonal rainfall. The seasonal rainfall will reset on May 1 each year. Unlike the other plots below, this information is automatically refreshed every minute.
Wind Direction
The wind direction polar plot is also known as a Radar Plot; it shows the most recent wind direction at the outside of the polar plot, similar to the depiction of the original NSC "Windicator". If the wind drops below 0.1 knot, the direction is frozen until the wind increases above 0.1 knot.
Wind Frequency
The wind frequency polar plot is also known as a Wind Rose. The average wind data points are grouped by speed and direction according to one of 7 speed ranges and 16 compass (cardinal) points. Groups are plotted as color-coded sectors.
Wind: Prevailing & Gusts
This chart presents prevailing wind strength and direction (based on True North) on an X-Y scale. The directional arrow is replaced by a small dot if the wind drops below 0.1 knot. The vertical axis adjusts its scale automatically to accommodate the winds over the previous 6 hours.
Temperature, Pressure & Humidity
Self-explanatory, similar to the chart, "Wind: Prevailing & Gusts".
Water Level
The water level graph uses data from the Environment Canada Water Office, specifically the Hydrometric data for station 02KF005 (Britannia). This data is updated every 2 hrs (Apr-Oct), or 4 hrs (Nov-Mar). Be advised that there are occasional data gaps, characterized by constant levels over several time intervals, as well as occasional data lags when no new data is available.
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