Weather: web mapping layer information

Canada's New Weather Radar Map

This video demonstrates Canada’s new weather radar map. It shows users how to view the map and how to use the new tools and features available on www.weather.gc.ca.

Transcript:

Check out our new radar map!
With new tools!
Control the animation!
And get the details!
Canada’s new weather radar map
Canada.ca/weather

Radar

Weather radar is a tool for tracking storms and allows you to see the location and movement of precipitation. The legend on the radar map indicates the intensity of the expected precipitation. This intensity is measured by the reflectivity of the rain or snow captured in the radar beam.  

The radar displays two modes, Rain or Snow, depending on the season. Rain mode (default April 1 to November 30; expressed in mm/h) would display the radar for the reflectivity of liquid precipitation. Snow mode (default December 1 to March 31; expressed in cm/h) would display the radar for the reflectivity of frozen precipitation. Users have the option to change this mode, depending on the temperature at their location of interest. Note, however, that these two radar layers do not allow several types of precipitation to be displayed on the same map. This means that there can be snow in some places even if the rain mode is chosen.

Weather radar measures the properties of precipitation (intensity, shape, etc.) while helping to monitor any form of precipitation and can help forecasters issue advance warnings of severe weather. These radar observations are also useful to the public in determining when precipitation will reach their area.

For historical radar products (archived images), visit the “Canadian Historical Weather Radar” page.

Intensity Scale

The radar layer intensity can be displayed using an eight or fourteen colour palette. By default, the fourteen colour palette is used, but some users may find the eight colour palette more accessible.

14 Colour Display

Rain
mm/h

Colours

Colour
name

Snow
cm/h

Intensity

200+

 

Dark purple

20+

Heavy

125 - 199.9

 

Light purple

10.0 - 19.9

Heavy

100 - 124.9

 

Pink

7.5 - 9.9

Heavy

64.0 - 99.9

 

Red

5.0 - 7.4

Heavy

50.0 - 63.9

 

Dark Orange

4.0 - 4.9

Moderate

32.0 - 49.9

 

Orange

3.0 - 3.9

Moderate

24.0 - 31.9

 

Light orange

2.0 - 2.9

Moderate

16.0 - 23.9

 

Yellow

1.5 - 1.9

Moderate

12.0 - 15.9

 

Dark green

1.0 - 1.4

Moderate

8.0 - 11.9

 

Medium green

0.75 - 0.99

Moderate

4.0 - 7.9

 

Green

0.5 - 0.74

Moderate

2.0 - 3.9

 

Light green

0.3 - 0.49

Moderate

1.0 - 1.9

 

Dark blue

0.2 - 0.29

Light

0.1 - 0.9

 

Light blue

0.1 - 0.19

Light

Long description 

14 colour intensity scale alongside rain and snow value by intensity.

8 Colour Display

Rain
mm/h

Colours

Colour
name

Snow
cm/h

Intensity

125+

 

Dark purple

10.0+

Heavy

64.0 - 124.9

 

Purple

5.0 - 9.9

Heavy

32.0 - 63.9

 

Light purple

3.0 - 4.9

Moderate

16.0 - 31.9

 

Pink

1.5 - 2.9

Moderate

8.0 - 15.9

 

Dark green

0.75 - 1.4

Moderate

2.0 - 7.9

 

Medium green

0.3 - 0.74

Moderate

1.0 - 1.9

 

Green

0.2 - 0.29

Light

0.1 - 0.9

 

Light green

0.1 - 0.19

Light

Long description 

8 colour intensity scale alongside rain and snow value by intensity.

Time

The “short animation” (1 h) is a series of 7 frames at 10 minute intervals and is the default display. The “long animation” (3 h) is a series of 10 frames at 20 minute intervals.

Outages and no network

Grey hatching on the map indicates areas of no radar coverage where radar data is not available including areas where the lack of data is due to a radar being out of service. This coverage is dynamic and updated every 10 minutes.

For information on individual radar outages, visit the “Radar outages and maintenance” page.

Maps

The transportation base map adds major Canadian railways, roads and highways to the simple map. This map is open source and details are available at Canada Base Map Transportation (CBMT).

Caching

Your setting preferences, such as transparency, radar intensity, animation speed and length, will be cached for future visits. Clearing the cache will erase these preferences and return you to default settings.

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