Weather at Osoyoos

Questions About Our Data

Environment Canada CWYY-AUTO Data


Temperature, precipitation and wind are being obtained from Environment Canada's automated station located at Kinsmen Park in East Osoyoos. This station updates every minute throughout the day. Precipitation will give context to our station's reading when pole vibration causes the rain sensor to misbehave.

This station is located at grounf level within a short distance, 470 metres of Desert Mirage. Latitude 49.028292, Longitude -119.441041, Elevation 284.2 metres. Corner of Highway 3 and Tamarack Drive.

Count on Regular Calibrations

The SKY leaves the factory with pretty good calibration, but calibration can shift during shipping and setup, and will drift over time. Also, your particular installation can affect SKY's calibration (Levelness, stiffness of mount). Fortunately, SKY has a feature that no other weather station in the world has: It learns about your location and produces more accurate data over time. SKY is now going through a continuous learning process that automatically adjusts its calibration as necessary. You probably won't notice anything odd, but rest assured it's only temporary.

How frequently are measurements reported by the sensors?

All values are reported on a one-minute average cycle. Lightning strikes are instantaneously reported upon detection. The haptic rain sensor also reports instantaneous rain start events when more than 5 seconds of continuous rain occurs. The ultrasonic anemometer samples the wind every 3 seconds and sends an average of wind speed & direction to the Hub.

More on wind sampling...

Every 3 seconds the ultrasonic transducers sample the wind speed and direction. These values are averaged in one-minute observations. The lull is the lowest of the 3-sec readings and the gust is the highest of the 3 sec readings. The one minute averages become part of your station’s long term record. These are World Meteorological Organization (WMO) standard sampling methods.

How does the ultra-sonic anemometer work?

The ultra-sonic anemometer is comprised of 4 transducers housed in the top of the device. The Tempest measures wind speed and direction based on the time of flight of ultra-sonic pulses between pairs of transducers. This allows for a high degree of accuracy especially in variable wind conditions. For more information, check out Wikipedia on Ultra-Sonic Anemometers.

Beaufort Wind Scale
Wind force and descriptions
Force Speed Km/h Term Effects Observed on Land
0< 1CalmSmoke rises vertically.
11 - 5Light airDirection of wind shown by smoke drift, but not wind vanes.
26 - 11Light breezeWind felt on face. Leaves rustle. Ordinary vane moved by wind.
312 - 19Gentle breezeLeaves and small twigs in constant motion. Wind extends light flag.
420 - 28Moderate breezeRaises dust and loose paper. Small branches are moved.
529 - 38Fresh breezeSmall trees with leaves begin to sway. Crested wavelets form on inland waters.
639 - 49Strong breezeLarge branches in motion. Whistling heard in telephone wires. Umbrellas used with difficulty.
750 - 61Near galeWhole trees in motion. Inconvenience felt in walking against wind.
862 - 74GaleBreaks twigs off trees. Generally impedes progress. Walking into wind almost impossible.
975 - 88Strong galeSlight structural damage occurs, e.g. roofing shingles may become loose or blow off.
1089 - 102StormTrees uprooted. Considerable structural damage occurs.
11103 - 117Violent stormWidespread damage.
12118 - 133HurricaneRare. Severe widespread damage to vegetation and significant structural damage possible.

How does the haptic rain sensor work?

Tempest uses a patent-pending haptic rain sensor in the top of the device. Using a combination of pressure and capacitance, Tempest measures and counts each falling raindrop. Algorithms exclude things that are not rain (like the rumblings of a passing train or Harley). This allows Tempest to report the instant rain begins falling, the current intensity, and the total rain accumulation over time. Accuracy compares to a large tipping bucket, but does not get fouled with leaves or bird poop.

What are the rates of the rain intensity values?

VERY LIGHT: < 0.25 mm/hour
LIGHT: ≥ 0.25, < 1.0 mm/hour
MODERATE: ≥ 1.0, < 4.0 mm/hour
HEAVY: ≥ 4.0, < 16.0 mm/hour
VERY HEAVY: ≥ 16.0, < 50 mm/hour
EXTREME: > 50.0 mm/hour

Pressure trends: The following trends are determined from changes over 3 hour intervals...

Falling/Rising: if the magnitude of the pressure change is ≥ 1 hPa
Steady: if the magnitude of the pressure change is ≤ 1