For licensed hams who want to participate you will basically need a 2m rig and should attend one of the local CANWARN training session held every spring. At the training session, you will be instructed on what to look for during a severe weather event, and you will be briefed on the radio net protocol. You will also get a CANWARN map atlas so you can provide the net control station with your co-ordinates.
For others who want to listen to CANWARN radio operations, you will need a scanner that is capable of tuning the 144-148 MHz VHF ham band. Ideally, your scanner should also be able to cover the 440-450 MHz UHF ham band. Scanners are available at a number of radio shops (e.g. Radioworld in Toronto, or any Radio Shack store).
In the Toronto area, listen to VE3ULR on 442.025. This is the HUB of the CANWARN system for South Central Ontario, operating out of the Toronto Weather Office. Listen for the "CANWARN Net Control" Station with the callsign VE3YZW. 442.025 is located near Uxbridge, northeast of Toronto so you may not be able to hear it depending on your location. Also, remember, it will only be active with CANWARN traffic if a severe weather event exists. The Toronto CANWARN office uses the following frequencies in Central Ontario which can be linked using the 442.025 frequency:
Huron Shores CANWARN:
South Western Ontario:
Dufferin County ARES & Canwarn:
Other good local weather frequencies are as follows: 162.400 Toronto CN Tower; 162.475 St Catherines/Niagara; 162.550 Buffalo NOAA station. Marine frequencies are 161.650 and 161.775 for continuous marine and weather broadcasts.
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