NOAA Weather-channels (USA & Canada)

Throughout the US, there are over 900 transmitters utilized by NOAA and the National Weather Service (NWR). They transmit severe weather warnings (such as tornadoes and stuff) to Specialized Receivers. These are either stand-alone units or built-in for example into CB-radios. Of course, transmissions are also easily picked up on virtually any scanner. Locations, callsigns and more can be found at this URL. The frequencies are as follows:

Frequency	Public Alert Channel	Marine Channel	Official Name
162.400 MHz	1	36B	WX 2
162.425 MHz	2	96B	WX 4
162.450 MHz	3	37B	WX 5
162.475 MHz	4	97B	WX 3
162.500 MHz	5	38B	WX 6
162.525 MHz	6	98B	WX 7
162.550 MHz	7	39B	WX 1
161.650 MHz	8	21B	WX 8
161.775 MHz	9	21B	WX 9
163.275 MHz	10	21B	WX 10