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weather-info.png How to measure weather metrics at your microclimate.

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Overview

Measurements and Instruments

This display is from the Ambient Weather WS-5000 series after installation/configuration:
weather-ws-5000-891x527_z7ypgc.png

(-) and (+) adjust values: Glossary

(-)
Minus
Brightness 		(+)
Plus
Brightness
Adjust 		Backlight
On/Off
toggle 		Background
On/Off
toggle 		Pressure
Absolute
/Relative
toggle 		Channel History Set
Mode
  1. The icon is the AmbientWeather.net dashboard for a sample location. (FAQ)

  2. Wi-Fi signal strength icon. An exclamation point ! indicates the display is connected to Wi-Fi but not the Internet.

  3. Outdoor Sensor Array Low Battery Indicator

  4. Outdoor Sensor Array Signal Quality

  5. Outdoor Temperature (shown with the larger ring) is measured in Centigrade or Fereinheght by therometers. Above and below the current temp. in large numbers in the middle is the high of the day on top and low temp. of the day on the bottom. The time of day when that’s recalculated can be set in Settings.

  6. Humidity is the percentage of water vapor in the air divided by the Dew Point.

    A manual psychrometer (aka “sling psychrometer”) uses two thermometers. One has a wet wick around the bulb. The thermometer with the wet wick becomes cooler when water evaporates. The temperature difference on the two thermometers provides the Dew Point.

    Manual hygrometers use a polished mirror. As air within the hygrometer is cooled to the dew point, moisture forms on the mirror, which blocks some of the reflected light, indicating that the dew point temperature has been reached.

  7. Wind:
    • Wind direction (blue arrow) is measured in compass degrees by wind vanes (looks like an airplane)
    • Wind speed and Gust in mph is measured by anemometers within 10-minute average wind direction (larger gray arrow).
    • Old anemometers have spinning cups
    • New anemometers have ultrasonic technology that has no moving parts.
  8. Leak detector status (channels 1-4, if installed)
  9. Soil moisture, leaf wetness CH4 (Channel 4 among channels 1-8 for each of 8 WH31 Temp/Humidity remote sensors that can be added.
  10. Current date and time
  11. Lighting detector last strike, last strike time and strikes per hour (if installed).
  12. Indoor, Channel 1-8 humidity
  13. Indoor, Channel 1-8 temperature
  14. CH (Channel) scroll mode indicator
  15. CH7 Channel 7 indicator
  16. Rain icon: maximum is 1.4 inch.
    • “Rate”, daily, hourly, weekly, monthly and yearly rain inches
  17. Forecast icon based on rate of change of pressure

  18. “Barometer Reading”: BLOG: Atmospheric pressure is also called Barometric pressure because it’s measured by legacy barometers that measure the compression of mercury due to the weight of air above a square inch. The absolute pressue measured at Mean Sea Level (MSL) is 14.696 PSI (pounds per square) inch of mercury (due to gravity). That’s a constant 1013.25 hPa (hectoPascals) aka “millibars”, also designated as “1 ATM” by the International Standard Atmosphere (ISA) standard. That’s the equivalent of 29.92 inHg (inches of mercury, symbol Hg).

    Wikipedia notes that the highest sea-level pressure on Earth occurs in Siberia, where record highs are 1,085 hPa (15.74 psi; 32.0 inHg). The lowest measurable sea-level pressure is found at the centres of tropical cyclones and tornadoes, with a record low of 870 hPa (12.6 psi; 26 inHg). The lowest place on Earth, the Dead Sea at 430 metres (1,410 ft) below sea level, has a typical atmospheric pressure of 1,065 hPa.

    CALCULATOR: Temperature and humidity also affect the density of the air, which in turn affects atmospheric pressure. Pressure is proportional to temperature and inversely related to humidity, and both of these are necessary to compute an accurate figure.

    Relative (REL) pressure readings decrease as you gain altitude AND as heavier clouds move away. To differentiate between altitude and weather impact, weather reports of locations are normalized relative to sea level. In the US, three digits are all that are transmitted: decimal points and the one or two most significant digits are omitted: 1,013.2 hPa (14.695 psi) is transmitted as 132; 1,000 hPa (100 kPa) is transmitted as 000; 998.7 hPa is transmitted as 987; etc.

    REMEMBER: A system transmitting the last three digits transmits the same code (800) for 1080.0 hPa as for 980.0 hPa.

    In technical terms, “Atmospheric pressure is thus proportional to the weight per unit area of the atmospheric mass above that location.”

    BTW The weight of a column of freshwater of approximately 10.3 m (33.8 ft) is also “one atmosphere” (101.325 kPa or 14.7 psi). Thus, a diver 10.3 m under water experiences a pressure of about 2 atmospheres (1 atm of air plus 1 atm of water). Conversely, 10.3 m is the maximum height to which water can be raised using suction under standard atmospheric conditions.

  19. “Max Daily Gust” of wind in MPH.
  20. Moon Phase

  21. “10 MinAvg” (10-minute average) wind speed and compass direction

    compass-800x800_hvwmtu.webp

  22. “UV Index” (Ultraviolet Index) is measured by a UV meter (if installed).

  23. Under arc: am: Sunrise, pm: sunset. On the website is this tile:

    weather-amb-web-sun-moon-540x572.png

    FUN FACT: About 5 minutes is lost or gained each day.

  24. Solar Radiation (if installed) in wm/2 (Watts per square meter), Lux, or FC (Foot Candles). The measurement is used to calculate evapotranspiration - the potential for evaporation of moisture from the soil (or the reverse of rainfall) as a function of solar energy, wind, and temperature.

    Before electronic photoelectric sensors are used by computers, the Campbell-Stokes and Jordan Sunshine Recorders (in the UK) used a glass sphere to focus sunlight onto a recording card replaced each day, creating burn marks that indicate the duration of sunshine that day.

    Not part of the WS-5000 series, a pyrheliometers to measure sunshine intensity thru direct solar radiation (not sunshine duration). Pyrheliometers have a tubular structure that needs to be aimed at the sun, often mounted on a solar tracker. There are also pyranometers that have a dome-shaped sensor that can be seen from all angles, resembling a “UFO saucer”.

  25. “IN “(Indoor) air quality in ug/m3 by a PM2.5 sensor (if installed)

  26. “OUT” (Outdoor) Particulate monitor in ug/m3 by a PM2.5 sensor (if installed)

  27. Dewpoint is calculated for measuring the comfort level from moisture in the air. A Simplified version of the Magnus-Tetens Formula is:

    AirTemp - ( ( 100 − RelHumidity ) / 5 )

    According to NOAA:

    At 45 degrees or below, air feels “refreshing”.
    At 50, it’s “comfortable”. At 55, it’s “not bad”.
    At 60, it’s “muggy”. At 65 it’s “Very Humid”. At 70 it’s “tropical”.

    Technically, Dew Point is the temperature to which air must be cooled (at constant pressure) in order for it to become saturated (have 100% relative humidity). Dewpoint is the maximum amount of water vapor air can hold at a given temperature. When air cools to its dew point, it reaches 100% relative humidity, and any further cooling causes water vapor to condense into droplets, forming dew or fog.

    In other words, “The dew point is the temperature at which a given parcel of humid air must be cooled, at constant barometric pressure, for water vapor to condense into water. The condensed water is called dew. The dew point is a saturation temperature.”

    For example, if the temperature is 80 and the dew point 70, the relative humidity is 72%. Much more water is in the air at 100% humidity at a temperature of 70 degrees than at 30 degrees.

  28. “Feels Like” will always be cooler than the air temperature because it is calculated based on the impact of wind speed (Wind Chill Factor in cold temperatures) or humidity (Heat Index in hot temperatures) on human skin. high humidity can intensify the sensation of cold by increasing heat loss from your body. Likewise, a cloudy sky prevents sunlight from providing even slight warmth, making the chill feel even sharper. PROTIP: On cold windy days, wear “wind-proof” coats instead of woven sweaters because wind whisks away the thin layer of warm air your body creates to stay cozy, leaving you feeling the full bite of winter’s chill.

  29. The lightning icon appears when when conditions make it possible for lightning storms to form in the area. The dew point is the temperature at which air becomes saturated with moisture at a given pressure, leading to the formation of dew, fog, or frost. BLOG
  30. Daily Rain Icon: Rainfall is measured by rain gauges. Modern ones use ultrasonic technology that has less moving parts.

Maps of Neighborhood Variation

This map of temperatue around a location shows the extent of variation among microclimates within just a mile or two – generated by AmbientWeather.net

weather-neighbors-890x618.png

Comparison vs. other weather stations (upwind, downwind, etc.).

This meteograph shows the relationship of changes among several metrics over time:

weather-dew-temp-1019x312.jpg

The temperature (brown line) warms up (by the sun) during the day. Temperature cools down at night.

As air cools, humidity (purple line) rises to condensate as morning fog or clouds.

Condensation is likely to occur when the air temperature reaches the Dew point (green line) rises to the temperature when air becomes saturated with moisture (at a given pressure). That’s when rain and snow occurs.

But remember that temperature (brown line) and dew point (in green) change independently of each other. Each can change without affecting the value of the other.

To see metrics over time with multiple metrics overlaid together, click “Graphs & Tables” on the AmbientWeather.net dashboard for a sample location:

AWN+ subscription unlocks premium features like advanced map layers, degree day tiles, enhanced graphing, text alerts, and a 10-Day Hourly Forecast

Home Assistant integration. for smart Home display trends.

d3.js is a JavaScript library for producing dynamic, interactive data visualizations in web browsers. VIDEO

Upwind locations on the map would experience weather patterns (such as rain) before you (n=in a downwind location).

Internet Weather Reports

Python Program Code

I wrote a Python program to retrieve and format weather info from an API calls to openweather.com.

The program makes use of external modules, so can’t be run within ProgramWiz.

So run my program within Google’s Colab like the pros:

  1. Open a Terminal app.

  2. Bring the openweather.py file to the Terminal.

    Type an exclamation point character in front of each Bash CLI command such as git.

    In Google CoLab???

  3. To copy a file from your Google Drive: 
    !cp /content/drive/My\ Drive/Importing\ Scripts\ as\ Modules/utils.py /content

    Alternately, you can manually select the file using:

    files.upload()
  4. Set permissions: 
    chmod +x openweather.py
  5. Set .env file containing the API keys ???

  6. Because T-Mobile does not correctly identify your physical location, provide your US Zip Code when requesting the weather there:

    openweather.py program:

  7. Execute the program: 
    !./openweather.py -z 59041

    The weather service converts your Zip Code to a latitude and longitude:

    openweather.org
id: 5661766    at: 06:29 PM (18:29:44) 2025-04-01 TZ: -21600
       Sunrise: 06:55 AM (06:55:20) 2025-04-01 local time
        Sunset: 07:43 PM (19:43:30) 2025-04-01
overcast clouds at Laurel , country=US "lat=45.4959619&lon=-108.9589351"
  Latitude:  45.4959619° North of the Equator &
  Longitude: -108.9589351° East of the Meridian at Greenwich, UK
comfortable Dew Point of 25.78°F vs. 45.91°F at 45% humidity
  Feels like 39.42°F from Wind: 22.01 mph from NNW (313°)
  Visibility to 10000 meters
low -16 pressure at 997 hPa (HectoPascals = 9.97 millibars)
       vs. normal 1013.25 hPa at sea level
                  866    hPa at ground level

VIDEO: Readings from outlying weather stations are combined to provide a more accurate reading. During WWII, the Allies used stations in Iceland, and Ireland to forcast the weather for the Normandie Invasion on June 6, 1944.

Latitudes & Longitudes

A latitude and longitude make use of the Web Mercator Projection (EPSG:3857) which display spherical forms because it is much simpler to calculate than WGS 84 degrees (EPSG:4326) ellipsoidal datum. Land near the poles, such as Greenland, are distorted and appear larger than VIDEO: when moved to the equator for actual size. Google Maps, which uses it since 2005, cut off coverage at 85.051129° north and south. But the United States Department of Defense through the National Geospatial-Intelligence Agency has declared to be unacceptable for any official use.

weather-greenland-proj-470x289.png</a>

Instrument Technologies

There are several technologies to measure your weather:

Instrument manufacturers:

Several locally-run servers receive and display weather information:

Ambient Weather Instruments

Ambient Weather is a company that provides weather stations and data for consumer use.

Other Ambient Weather devices sold separately, with manuals online:

Weather on Roads in Each State

https://www.511mt.net/#&zoom=5.669649843806675&lon=-110.0832903124836&lat=45.86084166111809

DIY Weather Stations

Others made their own weather stations using Raspberry Pi and other components that include sensors like wind, rainfall, UV Index, Lux Level.

VIDEO:Solar-Powered WiFi Weather Station V20 follows the Book: on Off-Grid Solar Power from Amazon by Debasish Dutta at @opengreenenergy. Features:

  1. Monitoring Weather parameters like Temperature, Pressure, Humidity, altitude and UV level, etc.
  2. Connect to Wi-Fi, and upload the data to the web ( Blynk App and Thingspeak)
  3. Extra ports to add more sensors
  4. Remote Battery Status Monitoring
  5. Uses a powerful Li-Ion Battery ( 3400 mAh ) and Solar Panel (1W) for independence from external power source

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Cameras

https://www.youtube.com/live/8E84ogCRg8Y&t=1m OpenMV cameras meetup

v023 + Fix Trands :weather-info.mdx