Weather Questions

delayed or offline

Temporarily Offline or Transmission Delayed displayed across the webcam image

This situation will occur under the following circumstances.

An updated image is uploading at the same time your browser is trying to download the image. Wait 30 seconds and refresh your browser.

The current image is over an hour old indicates a power disruption at the camera location. This will correct automatically after the power is restored.

Power Failure

This situation will occur under the following circumstances.

When a new weather data file is uploading at the same time your browser is trying to access this file. Wait 30 seconds and refresh your browser.

The current data is over an hour old indicates a power disruption at the weather station location. The weather server requires a manual restart. This may take several days before this occurs.

Reporting of Snowfall.

The precipitation/rain gauge measures rainfall in millimetres. To be able to measure snowfall, a heater has been installed to melt the snow and measure it as rain.

A tipping bucket electronically records precipitation electronically. It has a funnel, like a simple rain gauge, but the funnel leads to two tiny "buckets." The two buckets are balanced (somewhat like a sea-saw) and each holds .2 mm of water. When one bucket fills, it tips down and is emptied while the other bucket fills with rain water. Each tip of the buckets causes the device to record an increase of .2 mm of rain.

Snowfall measurement determines the equivalent amount of water in a unit of snow. To obtain this ratio, the snow must be collected and melted into water. Generally, 10 mm of snow produces 1 mm of water. However, it can take up to 100 mm of loose, fluffy snow though as little as 2-4 mm of wet, compact snow can produce a millimetre of water.

Snow depth model in order to estimate snow depth based on liquid-equivalent snow gauge measurements.

The model for estimating snow depth will include the effects on snow depth of precipitation rate, snow density, wind speed, and ambient temperature. All measurements necessary for the estimate are taken from the Davis Instrument Tip Bucket Rain Collector and Wind vane with potentiometer Wind Direction Sensor.

The factor used to estimate snow depth for snowfall today is based on the average of measurements over the last 24 hours.

The factor used to estimate snow depth for snowfall this month is based on the average of measurements over the current month.
Snow Density Data

Kevin V. Galloway, Scott D. Landolt, Roy M. Rasmussen National Center for Atmospheric Research Boulder, CO

windbarb

Interpretation of the standard wind symbol

Wind Barb = Wind direction and speed

The black text "YYD" indicates where the readings are based. In this example YYD = Smithers Airport

The blue numeral "10" indicates temperature

The stem will indicate the direction "from" which the wind is blowing, in this case from the Southwest.

The barb(s) will indicate the speed of the wind in knots (1 knot = 1.9 km/hour), In this case 5 knots

Beaufort Scale (wind)

In Canada, maritime winds forecast to be in the range of 6 to 7 are designated as "strong"; 8 to 9 "gale force"; 10 to 11 "storm force"; 12 "hurricane force". Appropriate wind warnings are issued by Environment Canada's Meteorological Service of Canada: strong wind warning, gale (force wind) warning, storm (force wind) warning and hurricane force wind warning. These designations were standardized nationally in 2008, whereas "light wind" can refer to 0 to 12 or 0 to 15 knots and "moderate wind" 12 to 19 or 16 to 19 knots, depending on regional custom, definition or practice. Prior to 2008, a "strong wind warning" would have been referred to as a "small craft warning" by Environment Canada, similar to US terminology. (Canada and the USA have the Great Lakes in common.) However, there being no generally accepted definition of "small craft", and to have consistency between wind speed ranges and their associated warnings, the term "strong wind warning" has become the national Canadian norm. learn more...

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